80 results on '"WU Liang"'
Search Results
2. Boosting corrosion resistance and osteogenic activity of magnesium-based implants with metal ions chelated silk fibroin coating via binary solvent system
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Li, Haotong, Ma, Tingji, Zhang, Jingwu, Mao, Zhinan, Liang, Hongxing, Sun, Yuehua, Zhao, Hang, Ding, Yutao, Cao, Xinru, Zhang, Zhihan, Zhao, Wenjing, Wu, Liang, and Yang, Kang
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- 2024
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Catalog
3. "Smart" micro/nano container-based self-healing coatings on magnesium alloys: A review.
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Chen, Yonghua, Wu, Liang, Yao, Wenhui, Wu, Jiahao, Serdechnova, Maria, Blawert, Carsten, Zheludkevich, Mikhail L., Yuan, Yuan, Xie, Zhihui, and Pan, Fusheng
- Subjects
SELF-healing materials ,MAGNESIUM alloys ,HALLOYSITE ,SHAPE memory polymers ,POROUS polymers ,METAL-organic frameworks ,PROTECTIVE coatings ,SURFACE coatings ,CARBON nanotubes - Abstract
Coating technologies are a commonly used way to protect metals against corrosion. However, with more and more severe service environments of materials, many protective coating systems often are not environmentally friendly or toxic as in the case of chromates. Based on the world's abundant ideal magnesium (Mg) and its alloy, the smart self-healing anticorrosive coating can autonomously restore the damaged part of the coating according to the environmental changes, strengthen the corrosion protection ability, and prolong its service life. This paper reviews the research progress of smart self-healing coatings on Mg alloys. These coatings mostly contain suitable corrosion inhibitors encapsulated into micro/nano containers. Moreover, the different self-healing mechanisms and functionalities of micro/nano containers are discussed. The micro/nano containers range from inorganic nanocontainers such as mesoporous nanoparticles (silica (SiO 2), titanium dioxide (TiO 2), etc.), over inorganic clays (halloysite, hydrotalcite-like, zeolite), to organic nanocontainers such as polymer microcapsules, nanofibers, chitosan (CS) and cyclodextrin (CD), as well as, carbon materials such as graphene and carbon nanotubes and hybrids such as metal organic frameworks. The functioning of micro/nano containers can be divided in two principal groups: autonomous (based on defect filling and corrosion inhibition) and non-autonomous (based on dynamic bonds and shape memory polymers). Moreover, multi functionalities and composite applications of various micro/nano containers are summarized. At present, significant progress has been made in the preparation methods and technologies of micro/nano containers. Achieving long-term self-healing properties of coatings sensing of coating failure and early warning after self-healing function failure can be expected as the main development direction of self-healing corrosion protection coatings in the future. [ABSTRACT FROM AUTHOR] more...
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- 2023
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4. In-situ LDHs growth on PEO coatings on AZ31 magnesium alloy for active protection: Roles of PEO composition and conversion solution.
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Zhang, Gen, Wu, Liang, Serdechnova, Maria, Tang, Aitao, Wang, Cheng, Blawert, Carsten, Pan, Fusheng, and Zheludkevich, Mikhail L.
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MAGNESIUM alloys ,SURFACE coatings ,ELECTROLYTIC oxidation ,ALUMINUM nitrate ,LAYERED double hydroxides ,SODIUM nitrate - Abstract
In this work, plasma electrolytic oxidation (PEO) coatings were produced on magnesium alloy AZ31 in aluminate, silicate and phosphate- based electrolytes, and followed by hydrothermal treatments in order to synthesis layered double hydroxides (LDHs) based nanocontainers. LDHs synthesis was done in three different growth solutions (deionized water, sodium nitrate and aluminum nitrate containing solution). In frame of this work it was shown, that it was difficult to form LDHs on Si-based PEO coating, due to more stable silicate phases in comparison with aluminate and phosphate phases in respective PEO coatings. The obtained hybrid LDH/PEO coatings were characterized using SEM, EDS and GDOES, and then the corrosion protection was further investigated by EIS. Based on the obtained results, it was confirmed that, the hydrothermal treatments in Al
3+ containing solution played an important role on overall corrosion resistance for phosphate and silicate-based PEO coatings, but not for Al-based PEO coatings. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
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5. Controllable degradation behavior of Mg-Sr-Y alloys for the bio-applications.
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Li, Yingying, Yuan, Yuan, Wang, Jun, Wu, Liang, Cao, Fuyong, Zhang, Ligang, and Pan, Fusheng
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ALLOYS ,CONTINUOUS distributions ,CRYSTAL grain boundaries ,CORROSION resistance ,SOLID solutions ,MAGNESIUM alloys - Abstract
The biodegradation behavior and mechanical properties of Mg-Sr-Y alloys were systematically investigated for the medical application. The alloy (Mg-0.3Sr-0.5Y) exhibits a comparable UTS as 111.53 MPa and shows a general uniform degradation behavior with low corrosion rate as only 0.823 mm y
−1 in Hanks' solution. The simultaneous solid solution of Y in α-Mg phase and in Mg17 Sr2 phase reduces the micro-galvanic corrosion. Additionally, the formation of a compact composite film of Mg(OH)2 , Y2 O3 and Sr-substituted phosphate (Sr-HA) delivers the protection for the matrix. Low corrosion rate, fine precipitates and dispersed Y rich-zones, which hinder the corrosion propagation, further guarantees a uniform degradation behavior. While, with increasing Sr content, the corrosion resistance is deteriorated because of the formed continuous distribution of Mg17 Sr2 along grain boundaries. By tailoring composition and structure, Mg-Sr-Y alloys with balanced mechanical and bio-degradation properties can be promising for the bio-applications. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
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6. Graphene-based anti-corrosion coatings on magnesium alloys: a review.
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Zhou, Yan, Li, Qian, Atrens, Andrej, and Wu, Liang
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MAGNESIUM alloys ,PROTECTIVE coatings ,SURFACE coatings ,SURFACES (Technology) ,ELECTRODE potential ,CORROSION potential - Abstract
Magnesium alloys are low in density, high in strength and non-toxic, nevertheless, their industrial application is substantially limited owing to their low electrode potential and susceptibility to corrosion. Surface and coating technology is widely used to improve their corrosion resistance. Graphene is one candidate material for anti-corrosion coatings because of its high aspect ratio, outstanding chemical resistance and good physical resistance. Its good barrier properties mean that graphene may have a wide range of applications in magnesium alloy coatings. This paper reviews (i) the potential of graphene for anti-corrosion coatings, (ii) the production methods and types of graphene anti-corrosion coatings, (iii) their properties, (iv) the protection mechanisms and (v) the future development trends of graphene-based corrosion protective coatings on magnesium alloys. [ABSTRACT FROM AUTHOR] more...
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- 2023
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7. Corrosion inhibitors for corrosion resistance and self-healing of PEO/MgAlLa layered double hydroxides coating on Mg-Gd-Y-Zn alloy.
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Wu, Jiahao, Wu, Liang, Wu, Mingyi, Yao, Wenhui, Chen, Yonghua, Yuan, Yuan, Xie, Zhihui, Wu, Guozhi, and Pan, Fusheng
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LAYERED double hydroxides , *ELECTROLYTIC oxidation , *MAGNESIUM alloys , *CORROSION resistance , *MAGNESIUM hydroxide , *SELF-healing materials - Abstract
A PEO/MgAlLa LDHs (P/MAL LDHs) coating was prepared by in-situ grown on the surface of Mg-Gd-Y-Zn alloy. The loading behaviors of metavanadate ion, tartrate ion, 3,5-dinitrosalicylate ion, 2-hydroxy-1,4-naphthoquinone anion and 4-aminophenol anion corrosion inhibitors were further investigated. The results showed that different inhibitors have different effects on the structures, morphologies, compositions, corrosion resistances, corrosion inhibition efficiencies and self-healing properties of the P/MAL LDHs coating. Among them, the P/MAL LDHs-A coating loaded with 4-aminophenol anion had the best corrosion resistance (corrosion current density i corr of 2.3 × 10−10 A cm−2, low-frequency impedance modulus value | Z | 0.01 of 8.3 × 107 Ω cm2). The P/MAL LDHs-A coating could complete self-healing within 24 h, whose corrosion resistance (| Z | 0.01 = 3.0 × 107 Ω cm2) was restored. Moreover, the corrosion resistance and self-healing mechanisms of the P/MAL LDHs-A coating were revealed. [Display omitted] • PEO/MgAlLa LDHs coatings loaded with corrosion inhibitors were prepared on Mg-Gd-Y-Zn alloy. • The 4-aminophenol entered the interlayer of MgAlLa LDHs, making the spacing increase to 15.60 Å. • The nanosheets of P/MAL LDHs-A coating resembled closed "pyramid" to block corrosive ions. • The 4-Aminophenol improved corrosion inhibition efficiency and self-healing property of the coating. • The 4-aminophenol and La3+ exhibited a "Stage release-Spatial deposition" self-healing process. [ABSTRACT FROM AUTHOR] more...
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- 2025
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8. ZnAl-LDH@MXene modified by inhibitor as a nanofiller applied on Mg alloys coating protection.
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Wu, Yulong, Wu, Liang, Yao, Wenhui, Chen, Yonghua, Zhou, Yan, Wang, Linqian, Wu, Ting, Jiang, Bin, Atrens, Andrej, and Pan, Fusheng
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EPOXY coatings , *EPOXY resins , *WEAR resistance , *MECHANICAL wear , *SURFACE coatings , *SELF-healing materials , *MAGNESIUM alloys - Abstract
Recently, MXene/Epoxy coatings have attracted attention for its outstanding corrosion and wear resistance. However, the self-restacking tendency of MXene in epoxy resins affects the mechanical properties of coatings. Herein, ZnAl-LDH-NO 3 - nanosheets were grown on MXene by one-step hydrothermal method to inhibit its spontaneous aggregation, and then the ZnAl-LDH-NO 3 -@MXene mixed with epoxy resin was spun onto the pre-prepared Mg PEO coatings. ZnAl-LDH-NO 3 -@MXene nanocomposite had long-term dispersibility, resulting in a satisfactory sealing of the Mg PEO coatings. The lowest wear rate and corrosion current density of the final coating demonstrated that LDH and MXene nanosheets presented a good synergistic effect. Moreover, nitrate was simultaneously intercalated into the guest layer of the ZnAl-LDH providing a self-healing function. This work proposed a new strategy to solve the self-restacking of MXene and facilitate its anticorrosion/wear applications in epoxy coatings: that is MXene-based nanocomposite. [Display omitted] • ZnAl-LDH carrying NO 3 − was grown on Ti 3 C 2 nanosheets by one-step hydrothermal. • The nanocomposite has a self-healing ability, giving a good sealing of PEO film. • MXene and ZnAl-LDH have synergy effect to enhance anticorrosion/wear of coating. [ABSTRACT FROM AUTHOR] more...
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- 2023
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9. Growth behavior and corrosion resistance of graphene oxide/MgAl Layered double hydroxide coating grown on micro-arc oxidation film of magnesium alloys.
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Chen, Yanning, Wu, Liang, Yao, Wenhui, Wu, Jiahao, Yuan, Yuan, Jiang, Bin, and Pan, Fusheng
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MAGNESIUM alloys ,LAYERED double hydroxides ,GRAPHENE oxide ,CORROSION resistance ,SURFACE coatings ,CHEMICAL structure - Abstract
[Display omitted] • The GO makes the LDHs grow in any direction and increases the coating thickness. • The synergistic effect of GO and LDHs prolongs the corrosive medium diffusion path. • MAO/LG coating improves corrosion resistance of AZ31 alloys. The MgAl Layered double hydroxides (LDHs)/graphene oxide (GO) composite film was fabricated in situ on the micro-arc oxidation (MAO) film (MAO/LG) of AZ31 magnesium alloy in one step by hydrothermal chemical conversion method. The growth behavior and corrosion properties of LG films were investigated. The results show that the chemical structure, composition and morphology of the LG film will gradually change with the extension of the hydrothermal treatment time based on using the self-dissolved cation (Mg
2+ and Al3+ ) in the MAO film as the source of growing LDHs without introducing any external metal cations. The potentiodynamic polarization showed that the MAO/LG-12 h coating (1.28 × 10−9 A/cm2 ) after in situ growth for 12 h was more corrosion resistant than the MAO coating (8.49 × 10−6 A/cm2 ). The synergistic effect of GO and LDHs can significantly improve the corrosion protection ability of MAO coating. In addition, the transition process of the growth behavior of the LG film layer on the MAO coating is explained in detail. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
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10. Preparation and corrosion behavior of MAO based MOFs coatings with excellent film-forming and adhesion properties.
- Author
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Chen, Yonghua, Wu, Liang, Wu, Mingyi, Yao, Wenhui, Wu, Jiahao, Zhou, Yan, Yuan, Yuan, Xie, Zhihui, and Pan, Fusheng
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MAGNESIUM alloy corrosion , *CORROSION resistance , *METAL-organic frameworks , *ION traps , *CHELATES , *MAGNESIUM alloys , *EPOXY coatings - Abstract
Magnesium (Mg) alloys can be applied in many fields, but their poor corrosion resistance limits their widespread applications. Metal-organic frameworks (MOFs) are often used as fillers in the field of corrosion protection due to their poor adhesion. In order to improve the film-forming performance and adhesion of MOFs coatings, and enhance the corrosion resistance of AZ31 Mg alloys, various MOFs coatings were prepared on the Mg alloy micro-arc oxidation (MAO) coating. The results demonstrated that the MAO facilitated film-forming of MOFs and enhanced their adhesion. Moreover, MOFs crystals can seal the pores of MAO, capture corrosive ions, and form insoluble chelates, significantly improving the corrosion resistance of Mg alloys. Among them, the Ce-MOF exhibited the highest corrosion resistance and the lowest corrosion rate, with a corrosion current density of 8.68 × 10−8 A/cm2 after immersing for 30 min. Moreover, MOFs coatings exhibited good stability and durability, and even after immersing in 3.5 wt% NaCl solution for 14 days, their corrosion protection effects were still superior than MAO. [Display omitted] • Various MOFs coatings were prepared on the Mg alloy MAO coating. • MAO facilitated MOFs film-forming and making them exhibited good adhesion with AZ31. • MOFs crystals can seal the pores of MAO, capture corrosive ions, and form insoluble chelates with the Mg matrix. • Ce-MOF coating exhibited lowest corrosion rate and highest corrosion resistance. [ABSTRACT FROM AUTHOR] more...
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- 2024
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11. Development of metal-organic framework (MOF) decorated graphene oxide/MgAl-layered double hydroxide coating via microstructural optimization for anti-corrosion micro-arc oxidation coatings of magnesium alloy.
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Chen, Yanning, Wu, Liang, Yao, Wenhui, Wu, Jiahao, Xiang, Jianpeng, Dai, Xiaowei, Wu, Tao, Yuan, Yuan, Wang, Jingfeng, Jiang, Bin, and Pan, Fusheng
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MAGNESIUM alloys ,METAL-organic frameworks ,LAYERED double hydroxides ,SURFACE coatings ,GRAPHENE oxide ,BUFFER layers - Abstract
• GO/LDHs coating (G/LDHs) as a connecting carrier was prepared on the MAO coating. • ZIF-8 particles continuously grow symbiotically on G/LDHs coating (ZG/LDHs coating). • ZG/LDHs coating improves corrosion resistance of AZ31 alloys. • It is feasible to build high-performance anticorrosive coatings with MOF materials. An efficient and simple in-situ growth strategy has been discovered for the preparation of highly reproducible and continuous symbiotic ZIF-8-based anticorrosion coating by using graphene oxide (GO)/MgAl-NO 3 layered double hydroxides (G/LDHs) buffer layer as a new type of connecting carrier based on micro-arc oxide (MAO) coating of AZ31 magnesium alloy. The components of ZIF-8 were adsorbed and bounded to the surface of the G/LDHs buffer layer-modified substrates to promote the nucleation of ZIF-8, thus growing a phase-pure, uniform, and good symbiosis ZIF-8 membrane. ZIF-8 particles with different growth times compensate for the grain boundary defects of the G/LDHs coating precursor buffer layer to different degrees. The prepared ZIF-8-based coating has excellent stability and corrosion resistance. The results demonstrate that the G/LDHs buffer layer provides a new channel for the MOF-modified MAO substrate of AZ31 magnesium alloy. It also proves that it is feasible to build high-performance anticorrosive coatings with MOF materials. [ABSTRACT FROM AUTHOR] more...
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- 2022
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12. Multi-solute solid solution behavior and its effect on the properties of magnesium alloys.
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Wang, Jun, Yuan, Yuan, Chen, Tao, Wu, Liang, Chen, Xianhuan, Jiang, Bin, Wang, Jingfeng, and Pan, Fusheng
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SOLID solutions ,ALLOYS ,MAGNESIUM alloys ,SOLUTION strengthening - Abstract
The low-density magnesium (Mg) alloys are attractive for the application in aerospace, transportation and other weight-saving-required fields. The mechanical properties and corrosion properties of Mg alloys are the key-property issues for the wide application. It is surprising to find that the solid solution of alloying elements in the α-Mg phase can have multi-effects on the properties of Mg alloys, e.g., solid solution strengthening, solid solution corrosion-resistance-enhancing, etc. Additionally, the alloy design theory of "solid solution strengthening and ductilizing" proposed by Pan and co-workers has attracted extensive attentions. It is promising that by selected proper multi-alloying-elements (with optimal ratio) solid solutioned in the α-Mg phase, the comprehensive properties of Mg alloys can be synergistically improved. In this work, the solid solution behavior of Mg alloys and the followed solid solution property-enhancing effects were reviewed. The mechanisms proposed recently by researchers for these solid solution property-enhancing behaviors were presented, and the related calculations and predictions were also described. It is shown the demonstrations of the fundamentals for the solid solution property-enhancing of Mg alloys, especially from the atomic inter-reaction aspects, still require elaborated characterization work and calculation work. Additionally, it could be expected that the multi-solute in Mg alloys can bring many possibilities, or, in another saying, "cocktail effects". With understanding the multi-solute interaction behavior and the corresponded solid solution property-enhancing effects, the good balanced high-performance Mg alloys can be developed. [ABSTRACT FROM AUTHOR] more...
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- 2022
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13. Active corrosion protection of phosphate loaded PEO/LDHs composite coatings: SIET study.
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Zhang, Gen, Jiang, E, Wu, Liang, Tang, Aitao, Atrens, Andrej, and Pan, Fusheng
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PHOSPHATE coating ,COMPOSITE coating ,ELECTROLYTIC oxidation ,MAGNESIUM alloys ,PHOSPHATES ,LAYERED double hydroxides ,HYDROXIDES ,ION exchange (Chemistry) - Abstract
This work produced a MgAl-layered double hydroxide by hydrothermal treatment of a plasma electrolytic oxidation (PEO) coating on magnesium alloy AZ31 in an phosphate electrolyte, followed by an ion-exchange reaction in 0.1 M phosphate solution. The coated specimens were scratched. Characterization, including utilization of the localized technique SIET, measured the pH and pMg distributions and optical morphologies around the artificial defects during immersion in 0.05 M NaCl solution. In contrast with phosphate loaded PEO/LDHs, a stronger alkalinization area (with pH 11.4∼12.3) appeared in the passive PEO specimens. Due to formation of insoluble Mg(OH) 2 products, the pMg map showed depletion of Mg
2+ in this high pH area. Combined with optical morphologies and SEM images, the better self-healing ability toward defects for phosphate loaded PEO/LDHs was confirmed. [ABSTRACT FROM AUTHOR] more...- Published
- 2022
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14. Coupling a titanium dioxide based heterostructure photoanode with electroless-deposited nickel-phosphorus alloy coating on magnesium alloy for enhanced corrosion protection.
- Author
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Liu, Yue, Peng, Feng, Yang, Guang-Ling, Xie, Zhi-Hui, Dai, Wenxin, Ouyang, Yuejun, Wu, Liang, and Zhong, Chuan-Jian
- Subjects
MAGNESIUM alloy corrosion ,MAGNESIUM alloys ,CORROSION & anti-corrosives ,TITANIUM dioxide ,CATHODIC protection ,FIELD emission electron microscopy ,ELECTRON paramagnetic resonance - Abstract
• Covalent organic framework (COF) modified TiO 2 nanoarray composite was prepared. • Composite shows superior photoelectrochemical conversion and cathodic protection. • Achieved 0.42 mA cm
ipt>−2 photocurrent density and 0.66 V open circuit potential drop. • Formation of a direct Z-scheme heterojunction between COF and TiO 2 is verified. • Synergistic corrosion protection of ni interlayer and composite is discussed. The utilization of photoelectrochemical cathodic protection (PECCP) enables an indirect corrosion protection of metals with low self-corrosion potential by introducing a metallic nickel interlayer. However, the ability to enhance the PECCP efficiency remains challenging because of the inherent property of the semiconductor. Herein, this ability is demonstrated by coupling a covalent organic framework (TpBD) decorated TiO 2 photoanode (TiO 2 /TpBD) with nickel coating on magnesium alloy for an effective corrosion protection. The composite photoanode showed direct PECCP for the nickel interlayer and indirect corrosion protection of the magnesium alloy. The composite structure of the nanotube array and the covalent organic framework for the photoanode were confirmed by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The enhanced photoelectrochemical conversion capability and PECCP performance of the nickel-coated Mg alloy were evidenced by the results from electrochemical and photoelectrochemical measurements including Mott-Schottky curves, photoinduced potential variations, and electrochemical impedance spectroscopy (EIS). Lastly, a corrosion protection mechanism is proposed, where the enhanced PECCP efficiency is attributed to the formation of a direct Z-scheme heterojunction, which is substantiated by the results from valence band (VB) XPS and electron spin resonance characterizations. [ABSTRACT FROM AUTHOR] more... - Published
- 2022
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15. Micro‐arc oxidation of magnesium alloys: A review.
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Yao, Wenhui, Wu, Liang, Wang, Jingfeng, Jiang, Bin, Zhang, Dingfei, Serdechnova, Maria, Shulha, Tatsiana, Blawert, Carsten, Zheludkevich, Mikhail L., and Pan, Fusheng
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MAGNESIUM alloys ,WEAR resistance ,SURFACE preparation ,OXIDATION ,CORROSION resistance ,ALLOYS - Abstract
Magnesium (Mg) and its alloys present great potential to be extensively applied in different applications. However, the relatively poor resistance to corrosion and wear significantly restricts their applications in practice. As one of strategies of surface treatment, micro-arc oxidation (MAO) process attracts a lot of attention, since it does not use neither expensive equipment, nor complicated manipulation. This review systematically discusses MAO mechanism and some typical models, which still need to be further developed to provide a better understanding and guide for future researchers. Subsequently, main influencing factors of MAO process are analyzed in detail. Further, some popular applications of MAO coatings are respectively reviewed, including biomedical application, decoration, thermal control, corrosion and wear resistance, and industrial applications in practice. The existing issues and future perspectives are finally discussed to further accelerate extensive applications of Mg alloys. [Display omitted] [ABSTRACT FROM AUTHOR] more...
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- 2022
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16. Preparing superhydrophobic nanocomposite coating with SiO2 nanoparticles on magnesium alloy.
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Luo, Yufang, Yao, Wenhui, Fu, Wensheng, Wu, Liang, Zhang, Dingfei, and Pan, Fusheng
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SURFACE coatings ,MAGNESIUM alloys ,NANOCOMPOSITE materials ,CONTACT angle ,POLYVINYLIDENE fluoride ,NANOPARTICLES - Abstract
Magnesium (Mg) alloys attract a lot of attention owing to their superior properties, while the poor corrosion resistance significantly restricts their extensive applications in practice. The development of a superhydrophobic coating can effectively decrease the contact area between corrosive solutions and the Mg substrate, consequently providing corrosion protection. Herein, a facile approach was proposed, with low cost and no damage to the environment. A nanocomposite coating composed of polyvinylidene fluoride and chemically modified SiO
2 nanoparticles was successfully constructed on the Mg alloy by a spraying method. The nanocomposite coating presented irregular structures with accumulated SiO2 nanoparticles, entrapped a lot of air pockets. The water contact angle was up to 151.8°. The corrosion current density was reduced by one order of magnitude compared to that of the bare substrate. Therefore, the nanocomposite coating can provide good corrosion protection for the Mg substrate, accelerating the extensive applications of Mg alloys. [ABSTRACT FROM AUTHOR] more...- Published
- 2021
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17. Self-healing PEO/MgAlLa LDHs-MXene composite coating loaded with 4-aminophenol for corrosion protection of Mg-Gd-Y-Zn LPSO Mg alloy.
- Author
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Wu, Jiahao, Wu, Liang, Yao, Wenhui, Zhou, Yan, Wu, Mingyi, Yuan, Yuan, Xie, Zhihui, Atrens, Andrej, Wang, Jingfeng, and Pan, Fusheng
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COMPOSITE coating , *SELF-healing materials , *CORROSION & anti-corrosives , *MAGNESIUM alloys , *CORROSION resistance , *ALLOYS , *MICROPORES - Abstract
• A PEO/MgAlLa LDHs-MXene@A composite coating was prepared on LPSO Mg-Gd-Y-Zn alloy. • Aminosilane promoted the compounding of MXene sheets with 4-aminophenol corrosion inhibitor. • The structure of LDHs was optimized by MXene@4-Aminophenol and can carry more corrosion inhibitor. • The P/MgAlLa LDHs-M@A coating had excellent corrosion resistance and self-healing properties. • The self-healing mechanism and process of the P/MgAlLa LDHs-M@A coating were elucidated. This paper provides an effective method to solve the problems that magnesium alloys easily corrode and their coatings are easily damaged. The micro-pores of PEO coating on the Mg alloy were sealed by in-situ growth of MgAlLa LDHs, and then compounded with MXene doped 4-aminophenol corrosion inhibitor to obtain PEO/MgAlLa LDHs-MXene@4-Aminophenol (P/MgAlLa LDHs-M@A) composite coating. The structure, morphology and composition of the P/MgAlLa LDHs-M@A coating contained the successful combination of MgAlLa LDHs and MXene@4-Aminophenol. The P/MgAlLa LDHs-M@A coating had excellent corrosion resistance and self-healing properties, with an impedance modulus | Z | 0.01 of 8.8 × 107 Ω cm2. Scratch defects were self-healed within 12 h. In addition, the mechanisms of corrosion resistance and self-healing were explained. [Display omitted] [ABSTRACT FROM AUTHOR] more...
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- 2024
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18. Corrosion resistance study of ZIF-67/Co-Fe LDHs composite coating on the surface of AZ31 magnesium alloy micro-arc oxidation film.
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Chen, Yonghua, Wu, Liang, He, Xiaoxiao, Yao, Wenhui, Wu, Jiahao, He, Yuantai, Zhou, Yan, Yuan, Yuan, Wang, Jingfeng, Xie, Zhihui, Atrens, Andrej, and Pan, Fusheng
- Subjects
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COMPOSITE coating , *MAGNESIUM alloys , *CORROSION resistance , *SURFACE coatings , *LAYERED double hydroxides , *OXIDATION - Abstract
Magnesium (Mg) alloys can be applied in many fields, but their poor corrosion resistance limits their widespread applications. This study prepared a zeolitic imidazolate framework (ZIF-67)/Co-Fe layered double hydroxides (LDHs) composite coating on micro-arc oxidation (MAO) coated Mg alloy AZ31. The surface, interface, and corrosion resistance of the composite coating were studied. The results demonstrate that the ZIF-67/LDHs composite coating showed lower corrosion current density i corr (1.31×10−8 A∙cm–2) than AZ31 (5.20×10−5 A∙cm–2), MAO (1.16×10−7 A∙cm–2) or LDHs (7.78×10−8 A∙cm–2). After immersing in a 3.5 wt% NaCl solution for 14 days, its i corr still remained the lowest, exhibiting excellent corrosion resistance to AZ31. It was of great significance in improving the corrosion resistance of Mg alloys, and this compositely growth technology was expected to be applied to other metals. [Display omitted] • A ZIF-67/LDHs composite coating was obtained on the surface of MAO-coated magnesium alloy. • ZIF-67 nanoparticles made MAO and Co-Fe LDHs coatings denser. • ZIF-67/LDHs composite coating exhibited excellent corrosion resistance to AZ31. • ZIF-67/LDHs composite coating provided active and passive protection for Mg alloy. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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19. The high-temperature oxidation resistance properties of magnesium alloys alloyed with Gd and Ca.
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Wu, Jiajia, Yuan, Yuan, Yu, Xiaowen, Chen, Tao, Li, Dajian, Wu, Liang, Jiang, Bin, Atrens, Andrej, and Pan, Fusheng
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ALLOYS ,OXIDE coating ,OXIDATION kinetics ,OXIDATION ,SURFACE roughness ,MAGNESIUM alloys ,HEAT resistant alloys - Abstract
This work studied the high-temperature oxidation resistance properties of Mg alloys with Gd and Ca. The oxidation property of Mg-3.5Gd-xCa (x = 0, 0.5, 1.0 and 3.0 wt%) alloys followed parabolic oxidation kinetics at 500 °C. A stable oxide film was formed on the alloy surface and limited further oxidation. The oxide film was composed of Gd
2 O3 , MgO and MgCO3 for Mg-3.5Gd and was mainly CaO and CaCO3 with increasing Ca content for Mg-3.5Gd-xCa alloys. The high oxidation affinity of Ca caused it to be oxidized preferentially and the fast diffusion of Ca in Mg alloys provided a source for the continuous oxidation of Ca at the surface. The parabolic rate constant, grains size and surface roughness of the oxide film increased with the increasing Ca content in Mg-3.5Gd-xCa alloy. The understanding of multi-element alloying on the oxidation behavior of Mg alloy is helpful for the design of multi-element oxidation-resistant Mg alloys. [ABSTRACT FROM AUTHOR] more...- Published
- 2021
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20. One-pot scalable in situ growth of highly corrosion-resistant MgAl-LDH/MBT composite coating on magnesium alloy under mild conditions.
- Author
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Hu, Ting, Ouyang, Yuejun, Xie, Zhi-Hui, and Wu, Liang
- Subjects
COMPOSITE coating ,MAGNESIUM alloys ,SALT spray testing ,SURFACE coatings ,X-ray photoelectron spectroscopy ,LAYERED double hydroxides - Abstract
• MgAl-LDH coating in-situ grows on magnesium alloy surface under mild conditions. • MgAl-LDH/MBT composite coating is obtained by a one-pot method under mild conditions. • Both MgAl-LDH and MgAl-LDH/MBT coatings show good corrosion protection to Mg alloy. • Growth and anti-corrosion mechanisms of the LDH coating are discussed and proposed. Current corrosion-resistant layered double hydroxide (LDH) coating on Mg alloy is usually in situ grown in autoclave by hydrothermal methods under high temperature and high-pressure conditions, which is unfavorable for industrial application. We report that an inhibitor (2-mercaptobenzothiazole, MBT) incorporated composite (MgAl-LDH/MBT) coating can be in situ deposited on bare AZ31 Mg alloy surface with the assistance of a chelating agent (ethylenediaminetetraacetic acid) under a relatively low temperature (95 °C) and ambient pressure by a one-pot method. The successful formation of LDH/MBT composite coating is confirmed by a series of characterizations, such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and energy dispersive spectroscopy (EDS). The corrosion resistance of the composite coating is evaluated by means of hydrogen evolution measurement, electrochemical impedance spectroscopy (EIS), Tafel polarization curves, and neutral salt spray test. The tests show that the LDH/MBT composite coating has a very low corrosion current density (1.73 10
−8 A cm−2 ), an extremely high charge transfer resistance (2.336 MΩ cm2 ), and does not show any corrosion pits even after 15 d of exposure to a NaCl solution or 7 d of exposure to salt fog environment, manifesting the good and robust corrosion protection. Lastly, the deposition and corrosion protection mechanisms of the MgAl-LDH/MBT composite coating are also discussed and proposed based on the EDS characterization of the coating after long-time exposure. [ABSTRACT FROM AUTHOR] more...- Published
- 2021
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21. MgAl-V2O74- LDHs/(PEI/MXene)10 composite film for magnesium alloy corrosion protection.
- Author
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Wu, Yulong, Wu, Liang, Zheludkevich, Mikhail L., Chen, Yanning, Serdechnova, Maria, Yao, Wenhui, Blawert, Carsten, Atrens, Andrej, and Pan, Fusheng
- Subjects
MAGNESIUM alloy corrosion ,MAGNESIUM alloys ,LAYERED double hydroxides ,INTERCALATION reactions ,NANOSTRUCTURED materials ,CONSTRUCTION defects (Buildings) - Abstract
1 The physical defects built by LDHs nanosheets are fully covered by (PEI/MXene) layer via layer-by-layer assembly. 2 The 2D MXene materials can effectively block the attack of corrosive species and enhance the corrosion protection of Mg alloy. 3 The MgAl-V 2 O 7
4- LDHs/(PEI/MXene) 10 composite films provided a better corrosion protection ability than that of n= 5 and 20. In this study, MgAl-V 2 O 74- LDHs/(poly(ethyleneimine)(PEI)/MXene) n composite films were synthesized via (i) in-situ hydrothermal growth of Mg-Al layered double hydroxides (LDHs) on AZ31 alloy followed by vanadate intercalation reactions, and (ii) the as-prepared MgAl-V 2 O 74- LDHs film was covered by layer-by-layer assembly using (PEI/MXene) n , where n=5, 10, and 20. Film characterization revealed that the outer layers (PEI/MXene) were assembled on the surface by electrostatic interaction and provided a good coverage of LDHs nanosheets. But, microcracks appeared gradually on the surface and destroyed the film integrity with increasing number of PEI/MXene layers. The corrosion tests indicated that the MgAl-V 2 O 74- LDHs/(PEI/MXene) 10 composite films provided a better corrosion protection ability than that of n=5 and 20. The outer layers (PEI/MXene) had a corrosion inhibition protective effect on MgAl-V 2 O 74- LDHs film. This work opened a new perspective of the MXene materials for anticorrosion application via a layer-by-layer assembly method. [ABSTRACT FROM AUTHOR] more...- Published
- 2021
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22. Corrosion protection properties of different inhibitors containing PEO/LDHs composite coating on magnesium alloy AZ31.
- Author
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Zhang, Gen, Jiang, E, Wu, Liang, Ma, Weigang, Yang, Hong, Tang, Aitao, and Pan, Fusheng
- Subjects
CORROSION & anti-corrosives ,MAGNESIUM alloys ,LAYERED double hydroxides ,COMPOSITE coating ,CERIUM oxides - Abstract
Corrosion inhibitors 2,5-pyridinedicarboxilate (PDC), sodium metavanadate (SMV) and 5-aminosalicylate (AS) were impregnated into porous PEO coatings respectively via vacuuming process, followed by fast sealing treatment in a Ce containing solution. After that layered double hydroxides (LDHs) based nanocontainers were respectively prepared on them via hydrothermal treatment. In frame of this work it was shown, that sealing effect for the pore was provided by formation of new phase CeO
2 on the surface of PEO coatings. And, hydrothermal preparation for preparing LDHs leaded obvious changes in structure and thickness of the coatings. In addition, impregnation of inhibitors was in favor of improving LDHs content in final composite coatings. EIS result indicated that AS/Ce-HT specimen exhibited a best corrosion protection. [ABSTRACT FROM AUTHOR] more...- Published
- 2021
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23. Active corrosion protection of super-hydrophobic corrosion inhibitor intercalated Mg–Al layered double hydroxide coating on AZ31 magnesium alloy.
- Author
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Wang, Xin, Jing, Chuan, Chen, Yuxiang, Wang, Xiushuang, Zhao, Gang, Zhang, Xing, Wu, Liang, Liu, Xiaoying, Dong, Biqin, and Zhang, Yuxin
- Subjects
MAGNESIUM alloys ,CORROSION & anti-corrosives ,LAYERED double hydroxides ,CORROSION resistance ,CONTACT angle ,ALUMINUM-zinc alloys ,ALUMINUM-magnesium alloys - Abstract
Magnesium alloys, the advanced lightweight structural materials, have been successfully applied in the manufacturing field. Unfortunately, their poor corrosion resistance restrains the potential wide applications. In this work, anti-corrosion coatings were fabricated via the in-situ growth of the corrosion inhibitors intercalated magnesium-aluminum layered double hydroxide (Mg–Al LDH) on AZ31 magnesium alloy and then post-sealing it by a super-hydrophobic coating. SEM, XRD, EDS, FTIR, XPS and contact angle test were conducted to analyze physical/chemical features of these coatings. Potentiodynamic polarization curves and electrochemical impedance spectroscopy were recorded to assess the anti-corrosion performance of prepared coatings. Surprisingly, Mg–Al LDH with molybdate intercalation and lauric acid modification achieves the excellent corrosion inhibition performance (99.99%) due to the multicomponent synergistic effect such as the physical protection of Mg–Al LDH, the corrosion inhibition of molybdate and super-hydrophobic properties of lauric acid. This work presents a scientific perspective and novel design philosophy to fabricate the efficient anti-corrosion coating to protect magnesium alloys and then expand their potential applications in other field. [ABSTRACT FROM AUTHOR] more...
- Published
- 2020
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24. Effects of deformation processes on morphology, microstructure and corrosion resistance of LDHs films on magnesium alloy AZ31.
- Author
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Chen, Jing, Wu, Liang, Ding, Xingxing, Liu, Qiang, Dai, Xu, Song, Jiangfeng, Jiang, Bin, Atrens, Andrej, and Pan, Fusheng
- Subjects
MAGNESIUM alloys ,CORROSION resistance ,MICROSTRUCTURE ,CORROSION & anti-corrosives ,LAYERED double hydroxides ,CESIUM ions ,PYROLYTIC graphite - Abstract
Highly oriented Mg-Al layered double hydroxide (LDHs) films were deposited on magnesium alloy AZ31 with different deformation processes by an easy in-situ growth method. The characteristics of the films were investigated by optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical, immersion and hydrogen evolution tests. The corrosion protection performance ranked the LDHs films as the increasing series: CS-LDHs (as-cast sample with LDHs) < AE-LDHs (asymmetric extrusion sample with LDHs) < SE-LDHs (symmetric extrusion sample with LDHs) < RS-LDHs (rolled sample with LDHs). A thicker and more compact LDH conversion coating was formed on the RS sample, and had the best corrosion protection performance. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
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25. Doublely-doped Mg-Al-Ce-V2O74- LDH composite film on magnesium alloy AZ31 for anticorrosion.
- Author
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Wu, Liang, Ding, Xingxing, Zheng, Zhicheng, Tang, Aitao, Zhang, Gen, Atrens, Andrej, and Pan, Fusheng
- Subjects
MAGNESIUM alloys ,MILD steel ,LAYERED double hydroxides ,X-ray diffractometers ,CRYSTAL structure ,COPPER corrosion - Abstract
A doublely-doped layered double hydroxide (LDH) film was produced on an anodized magnesium alloy AZ31. The Ce-doped Mg-Al LDH film was prepared by in-situ hydrothermal treatment method, and the intercalation of vanadate was realized by ion-exchange reaction. The structure, morphology and composition of as-prepared LDH film were investigated by X-ray diffractometer, field-emission scanning electronic microscope and energy dispersive spectrometry. Results indicated that a uniform and compact LDH film was formed and the intercalation of Ce
3+ and vanadate would change the crystal structure of LDHs. The results of the potentiodynamic polarization, electrochemical impedance spectra, hydrogen evolution and corrosion weight loss tests showed the Ce3+ and vanadate anions significantly improve the impedance of LDH film, and the active double-doped LDH film could effectively protect the magnesium substrate from corrosion. [ABSTRACT FROM AUTHOR] more...- Published
- 2021
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26. Clarifying the roles of grain boundary and grain orientation on the corrosion and discharge processes of α-Mg based Mg-Li alloys for primary Mg-air batteries.
- Author
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Yang, Huabao, Wu, Liang, Jiang, Bin, Liu, Wenjun, Song, Jiangfeng, Huang, Guangsheng, Zhang, Dingfei, and Pan, Fusheng
- Subjects
ALUMINUM-lithium alloys ,CRYSTAL grain boundaries ,MAGNESIUM alloys ,OPEN-circuit voltage ,ALLOYS ,GRAIN refinement ,ELECTRIC batteries - Abstract
• The macro and micro grain boundaries morphologies of α-Mg based Mg-Li alloys after corrosion and discharge are observed. • The correlation between microstructure and anode performance is defined. • The discharge properties of LAZ131 and LAZ531 alloys are measured. • The LAZ531 alloy possesses high and steady discharge voltage at small discharge current density for long time. The corrosion behavior at open circuit potential (OCP) and discharge properties under applied anodic currents of two α-Mg based Mg-Li alloys, i.e., LAZ131 and LAZ531, with different microstructural features for primary Mg-air batteries are investigated. The results show that the grain boundaries contribute equally to the corrosion and discharge processes, which are attacked preferentially than the grain interiors and accelerate the dissolution processes of α-Mg based Mg-Li alloys. The (10−10)/(11–20) orientated grains are attacked preferentially than the (0002) orientated grains on the corrosion and discharge process. The increased corrosion rate and improved discharge properties are attributed to the refinement of grain size, decreased content of (0002) orientated grains and increased content of (10−10)/(11–20) orientated grains. Of those, the LAZ531 alloy possesses high and steady discharge voltage at small discharge current density for long time, with the values of 1.4801 V at 2.5 mA cm
−2 and 1.3742 V at 10 mA cm−2 . [ABSTRACT FROM AUTHOR] more...- Published
- 2021
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27. Smart epoxy coating containing zeolites loaded with Ce on a plasma electrolytic oxidation coating on Mg alloy AZ31 for active corrosion protection.
- Author
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Zhang, Gen, Wu, Liang, Tang, Aitao, Ding, Xingxing, Jiang, Bin, Atrens, Andrej, and Pan, Fusheng
- Subjects
- *
EPOXY resins , *ZEOLITES , *MAGNESIUM alloys , *CORROSION & anti-corrosives , *CERIUM , *SELF-healing materials , *ELECTROLYTIC oxidation - Abstract
• The stimuli for release of the cerium ions from modified zeolites were studied. • The epoxy resin was doped with CeNaX and then PEO treated AZ31 specimens were coated with such epoxy resin. • The specimen modified by CeNaX had a good self-healing ability against corrosion. In present work, zeolite microparticles (NaX) were loaded with Ce3+, and the amount of Na exchanged for Ce was evaluated using EDS and EDXRF. Then the stimuli for release of cerium ions including pH, Mg2+ and Na+ cations were studied using ICP. Finally, the epoxy resin was doped with Ce-loaded zeolite microparticles (CeNaX), and was coated on PEO treated AZ31 substrate. The surface morphologies and self-healing ability also were characterized. The obtained results showed that NaX and CeNaX microparticles evenly embedded into the epoxy coating and the specimen modified by CeNaX had a good self-healing ability against corrosion. [ABSTRACT FROM AUTHOR] more...
- Published
- 2019
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- View/download PDF
28. Rapid hardening during natural aging of Al-Cu-Li based alloys with Mg addition.
- Author
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Wu, Liang, Chen, Yanchi, Li, Xianfeng, Ma, Naiheng, and Wang, Haowei
- Subjects
- *
MAGNESIUM alloys , *HARDENING (Heat treatment) , *ALUMINUM composites , *MECHANICAL properties of metals , *CHROMIUM-cobalt-nickel-molybdenum alloys - Abstract
Abstract With the introduction of 0.3 (wt%) Mg, the precipitation of monolayer GP zone was promoted in the quaternary alloy in comparison with the ternary alloy. The studied Al-Cu-Li-Mg alloy exhibited the accelerated aging response, enhanced Vickers hardness, superior yield strength and ultimate tensile strength over the ternary Al-Cu-Li alloy. [ABSTRACT FROM AUTHOR] more...
- Published
- 2019
- Full Text
- View/download PDF
29. Growth behavior of MgAl-layered double hydroxide films by conversion of anodic films on magnesium alloy AZ31 and their corrosion protection.
- Author
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Zhang, Gen, Wu, Liang, Tang, Aitao, Chen, Xiao-Bo, Ma, Yanlong, Long, Ying, Peng, Peng, Ding, Xingxing, Pan, Huiling, and Pan, Fusheng
- Subjects
- *
HYDROXIDES , *MAGNESIUM alloys , *ELECTROLYTIC oxidation , *THIN films , *CORROSION & anti-corrosives - Abstract
MgAl-LDH films were produced through hydrothermally chemical conversion of pre-prepared anodic films on Mg alloy AZ31. The growth behavior and corrosion performance of the LDH films were investigated. Results reveal that morphology, chemical compositions and structure of LDH films vary greatly as a function of the conversion treatment conditions. Internal sources of Mg 2+ and Al 3+ cations for the formation of LDH films were ascribed to: (i) degradation of the anodic films; and (ii) dissolution of the AZ31 substrate. Moreover, the Stranski-Krastanov (SK) growth mode, two-dimensional layer growth (2D) to three-dimensional (3D) growth, was proposed to explain the transformation process. [ABSTRACT FROM AUTHOR] more...
- Published
- 2018
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30. Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31.
- Author
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Zhang, Gen, Wu, Liang, Tang, Aitao, Ma, Yanlong, Song, Guang-Ling, Zheng, Dajiang, Jiang, Bin, Atrens, Andrej, and Pan, Fusheng
- Subjects
- *
ALUMINUM-magnesium alloys , *PROTECTIVE coatings , *LAYERED double hydroxides , *CORROSION & anti-corrosives , *ELECTROLYTIC oxidation - Abstract
A composite coating was produced via (i) plasma electrolytic oxidation (PEO) with Ce salt sealing, on which layered double hydroxides (LDHs) were deposited via a hydrothermal treatment, and (ii) then modified by phytic acid (PA) via an ion-exchange reaction. The final coating (characterized using XRD, XPS, FT-IR, SEM, EDS and GDOES) consisted of LDHs/Mg(OH) 2 /CeO 2 /Ce(OH) 3 with a non-uniform Ce distribution. The corrosion protection and self-healing ability were investigated using polarization curves, EIS, immersion tests and SVET. The composite coating modified with PA showed the most superior corrosion protection and self-healing ability, attributed to the synergistic effect between Ce species and phosphate. [ABSTRACT FROM AUTHOR] more...
- Published
- 2018
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31. Effects of Fe concentration on microstructure and corrosion of Mg-6Al-1Zn-xFe alloys for fracturing balls applications.
- Author
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Zhang, Cheng, Wu, Liang, Huang, Guangsheng, Chen, Lin, Xia, Dabiao, Jiang, Bin, Atrens, Andrej, and Pan, Fusheng
- Subjects
CORROSION in alloys ,MAGNESIUM alloys ,POWDER metallurgy ,HEAT treatment ,MICROSTRUCTURE ,COMPRESSIVE strength - Abstract
• The Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7, wt.%) alloys were prepared by powder metallurgy and hot extrusion. • The heat treatment somewhat decreased the corrosion rates whilst improved mechanical properties. • The Mg-6Al-1Zn-xFe alloys with high degradation rate and suitable compressive strength can be applied in fracturing balls. Mg-6Al-1Zn-xFe (x = 0, 1, 3, 5 and 7 wt%) alloys were prepared by powder metallurgy and followed by hot extrusion. Majority of Fe element exists as insoluble particles in the alloys. The as-extruded alloys showed higher degradable rates but less stable mechanical properties than as-annealed alloys. Corrosion rate of all the alloys increased with increasing Fe concentration, reaching 2.4 mL cm
−2 h-1 . 0.2% yield strength of all the alloys was higher than 150 MPa. In short, Mg-6Al-1Zn-xFe alloys have an attractive combination of corrosion and mechanical properties, which holds a bright future for fracturing balls applications. [ABSTRACT FROM AUTHOR] more...- Published
- 2019
- Full Text
- View/download PDF
32. Preparation and corrosion behavior of Mg(Li)-M layered double hydroxides films on the surface of magnesium-lithium alloy.
- Author
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Wu, Jiahao, Wu, Liang, Yao, Wenhui, Chen, Yonghua, Zhou, Yan, Wu, Mingyi, Yuan, Yuan, Xie, Zhihui, Wang, Jingfeng, and Pan, Fusheng
- Subjects
- *
MAGNESIUM-lithium alloys , *ALUMINUM-lithium alloys , *LAYERED double hydroxides , *MAGNESIUM alloys , *CORROSION resistance , *TARTARIC acid - Abstract
Different Mg(Li)-M (M: Al, Fe, Cr) layered double hydroxides (LDHs) films were successfully prepared on Mg-Li alloy with in-situ growth method. Further, the corrosion inhibitor was screened and the tartaric acid-loaded LDHs (Mg(Li)-M LDHs-TA) films were prepared. The morphologies, compositions, structures and corrosion resistance of the LDHs films changed before and after tartaric acid loading. The Mg(Li)-Cr LDHs-TA film exhibits the most excellent corrosion resistance with a current density i corr 1.5 × 10–9 A cm–2. Moreover, corrosion mechanisms of the Mg(Li)-M LDHs and Mg(Li)-M LDHs-TA films were discussed in combination with Scanning Vibrating Electrode Technique. [Display omitted] • Mg(Li)-M (M: Al, Fe, Cr) LDHs films were prepared on Mg-Li alloy by in-situ growth method. • The structures, compositions and corrosion resistance of six LDHs films were compared. • The corrosion resistance of Mg(Li)-Cr LDHs-TA film was improved by four orders of magnitude. • The corrosion behaviors of the Mg(Li)-M LDHs and Mg(Li)-M LDHs-TA films were analyzed by SVET. • A "dissolution – reproduction" cycle behavior of sediments inhibits or mitigates the corrosion. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
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33. Slippery liquid-infused porous surface by ZnAl-layered double hydroxide on AZ31 Mg alloys.
- Author
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Yao, Wenhui, Wu, Liang, Jiang, Bin, and Pan, Fusheng
- Subjects
ALLOYS ,PROTECTIVE coatings ,SUPERHYDROPHOBIC surfaces ,CONTACT angle ,HYDROXIDES ,MAGNESIUM alloys - Abstract
• ZnAl-LDH is in-situ synthesized on AZ31 Mg alloys. • The good ion exchangeability of LDH imparts load of corrosion inhibitor. • The nanopores of LDHs can anchor silicone oil well to form a SLIPS. • The SLIPS provides effective corrosion resistance for AZ31 Mg alloys. • The good long-term and reliable protection of SLIPS promotes wide use of Mg alloys. Metal corrosion causes tremendous economic losses, including Mg and its alloys. The development of protective coatings is a good strategy to alleviate or inhibit corrosion. Herein, a slippery liquid-infused porous surface (SLIPS) was fabricated on the AZ31 Mg alloy substrate, based on ZnAl-layered double hydroxide (ZnAl-LDH). Especially, the electrolyte pH was adjusted to synthesize ZnAl-LDH with different morphology to accommodate the most silicone oil for SLIPSs. A smooth and homogeneous liquid layer was stably anchored in the ZnAl-LDH, forming a SLIPS. Although water contact angle was less than 150° for the SLIPS, the water droplet can easily slide on the surface, presenting low adhesion to the external species. The SLIPS showed the best corrosion protection, with the lowest corrosion current density of 5.01 × 10
−9 A cm−2 and largest impedance modulus of 4.92 × 107 Ω cm2 . Moreover, a long-term immersion test and stability examinations in harsh conditions were carried out to further evaluate the performances of superhydrophobic surface and SLIPS. The much more stable liquid layer than air pockets made the SLIPS perform better and provide reliable corrosion protection. Therefore, SLIPSs can further promote the wide applications of Mg alloys. [Display omitted] [ABSTRACT FROM AUTHOR] more...- Published
- 2023
- Full Text
- View/download PDF
34. Synergistic effect of graphene oxide/ ternary Mg-Al-La layered double hydroxide for dual self-healing corrosion protection of micro-arc oxide coating of magnesium alloy.
- Author
-
Chen, Yanning, Wu, Liang, Yao, Wenhui, Wu, Jiahao, Yuan, Yuan, Xie, Zhihui, Jiang, Bin, and Pan, Fusheng
- Subjects
- *
MAGNESIUM alloys , *SELF-healing materials , *LAYERED double hydroxides , *OXIDE coating , *MAGNESIUM oxide , *GRAPHENE oxide , *GRAPHENE - Abstract
Micro-arc oxidation (MAO) coatings have good corrosion protection properties and can effectively inhibit the corrosion of magnesium alloy surfaces in salt environments. This study aimed to achieve and improve the dual self-healing and corrosion resistance of MAO coating by in-situ growth to form a hybrid coating of vanadate (V 2 O 7 4-) intercalated a graphene oxide (GO)-doped ternary Mg-Al-La layered double hydroxides (LDHs) (ternary L/G-V coating). The corrosion resistance and self-healing properties were verified by electrochemical experiments and scratch tests. Due to the synergistic effect of the strong barrier properties of GO and LDHs, the ternary L/G-V coating exhibits excellent anticorrosion ability. Interestingly, the ternary L/G-V coating also exhibits self-healing properties when corrosion ions reach the metal/coating interface due to the release of interlayer anionic corrosion inhibitor (vanadate) and rare earth cationic corrosion inhibitor (lanthanum) of LDHs. It makes up for coating defects in time and realizes the dual self-healing function of corrosion protection of MAO coating. [Display omitted] • The ternary Mg-Al-La layered double hydroxide (LDHs) was successfully constructed. • Graphene oxide (GO) and V 2 O 7 4− were doped into ternary LDHs (ternary L/G-V coating). • Ternary L/G-V coating has dual self-healing properties. • Ternary L/G-V coating improves corrosion resistance of AZ31 alloys. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
35. In situ growth of Mg-Zn-Al LDHs by ZIF-8 carrying Zn source and micro-arc oxidation integrated coating for corrosion and protection of magnesium alloys.
- Author
-
Chen, Yanning, Wu, Liang, Yao, Wenhui, Wu, Jiahao, Xie, Zhihui, Yuan, Yuan, Jiang, Bin, and Pan, Fusheng
- Subjects
- *
MAGNESIUM alloys , *MAGNESIUM alloy corrosion , *X-ray photoelectron spectroscopy , *SURFACE coatings , *CORROSION potential , *SCANNING electron microscopy - Abstract
For realistic large-scale applications, it is essential to prepare effective anti-corrosion coatings. In this study, ZIF-8 was first grown in situ on the pre-prepared MAO coating. Then, the Zn source in ZIF-8 and Mg and Al in the MAO coating were used to form an integrated coating, and the Mg-Zn-Al LDHs coating was formed on the MAO coating in one step by hydrothermal method (Mg-Zn-Al/Z LDHs). X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to confirm the chemical states, structural composition, and morphology of the Mg-Zn-Al/Z LDHs coating. The potentiodynamic polarization revealed that the corrosion protection ability of Mg-Zn-Al/Z LDHs coating (1.48 × 10−8 A/cm2) in 3.5 wt% NaCl solution is stronger than MAO coating (3.17 × 10−6 A/cm2). The feasibility of boosting the anti-corrosion ability of MAO coating was established by thorough examination of potential corrosion protection mechanisms in relation to Mg-Zn-Al/Z LDHs coating. [Display omitted] • The ZIF-8 particles and the MAO coating constitute an integral coating. • ZIF-8 carrying a Zn source anchored to MAO promotes the nucleation of ternary LDHs. • The immobilization of ZIF-8 facilitates Zn2+ trapping and corrosion resistance. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
36. Preparation of slippery liquid-infused porous surface based on MgAlLa-layered double hydroxide for effective corrosion protection on AZ31 Mg alloy.
- Author
-
Yao, Wenhui, Chen, Yonghua, Wu, Liang, Jiang, Bin, and Pan, Fusheng
- Subjects
PROTECTIVE coatings ,MAGNESIUM alloys ,CORROSION & anti-corrosives ,ALLOYS ,ELECTROMAGNETIC shielding ,CORROSION resistance ,SODIUM benzoate ,HYDROXIDES - Abstract
• MgAlLa-LDH is in-situ synthesized on AZ31 Mg alloy. • The nanopores of LDH provide accommodation for silicone oil to form a SLIPS. • The SLIPS provides better corrosion protection than a superhydrophobic coating. • Corrosion inhibitor of NaB is detected by HPLC after immersion test. • The SLIPS shows good self-cleaning and self-healing performances. The relatively poor corrosion resistance of magnesium (Mg) alloys significantly restricts their extensive applications in industry despite their superior properties such as good electromagnetic shielding, low density, and good biocompatibility. The formation of a protective coating, especially a hydrophobic coating, can provide corrosion protection for the underlying Mg alloys. Herein, a slippery liquid-infused porous surface (SLIPS) with good hydrophobicity was developed by infusing MgAlLa-layered double hydroxide (LDH) with silicone oil. In particular, the MgAlLa-LDH was intercalated with sodium benzoate to further improve the corrosion resistance. A homogeneous liquid layer was generated on the SLIPS, which can effectively prevent corrosion from external corrosive species. Compared with a superhydrophobic coating, the SLIPS showed better corrosion protection in both electrochemical and immersion tests, attributed to the better stability of liquid layer than air pockets. After immersion in 3.5 wt.% NaCl solution for 7 days, no obvious corrosion was observed on the SLIPS. Moreover, the SLIPS presents good self-cleaning and self-healing properties. These good performances made the SLIPS possible to be extensively applied in practice. [Display omitted] [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
37. A self-healing corrosion protection coating with graphene oxide carrying 8-hydroxyquinoline doped in layered double hydroxide on a micro-arc oxidation coating.
- Author
-
Chen, Yanning, Wu, Liang, Yao, Wenhui, Chen, Yonghua, Zhong, Zhiyong, Ci, Wenjun, Wu, Jiahao, Xie, Zhihui, Yuan, Yuan, and Pan, Fusheng
- Subjects
- *
LAYERED double hydroxides , *GRAPHENE oxide , *SURFACE coatings , *SELF-healing materials , *MAGNESIUM alloys , *OXIDE coating , *RING-opening reactions , *EPOXY coatings - Abstract
The fabrication of remarkable self-healing coatings is the key to achieving excellent anti-corrosion of magnesium (Mg) alloys. In this research, 8-hydroxyquinoline@graphene oxide (8-HQ@GO) composite was successfully synthesized through ring-opening reaction and a micro-arc oxidation (MAO) coating was grown on AZ31 beforehand. Afterwards, the 8-HQ@GO composite was doped into the layered double hydroxides (LDHs) sheet by hydrothermal chemical transformation based on the MAO coating without introducing any kind of salts. The incorporation of 8-HQ@GO composite and Mg-Al LDHs sheets can distinctly boost the corrosion resistance of AZ31 alloy. The self-healing performance and the anti-corrosion mechanism of MAO-LDHs/HG coating are discussed. [Display omitted] • The 8-hydroxyquinoline (8-HQ) successfully loaded on the graphene oxide (GO). • The 8-HQ@GO composite was doped into the layered double hydroxides (LDHs). • MAO-LDHs/8-HQ@GO (MAO-LDHs/HG) coating improves corrosion resistance of AZ31 alloys. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
38. Improving Mechanical Properties of Mg–Sc Alloy by Surface AZ31 Layer.
- Author
-
Zhang, Cheng, Peng, Cheng, Huang, Jin, Zhao, Yanchun, Han, Tingzhuang, Wang, Guangang, Wu, Liang, and Huang, Guangsheng
- Subjects
MAGNESIUM alloys ,ALLOYS ,LAMINATED materials ,SOLUTION strengthening ,SURFACE temperature ,MICROSTRUCTURE - Abstract
Building a gradient structure inside the Mg alloy structure can be expected to greatly improve its comprehensive mechanical properties. In this study, AZ31/Mg–Sc laminated composites with gradient grain structure were prepared by hot extrusion. The microstructure and mechanical properties of the Mg–1Sc alloy with different extrusion temperatures and surface AZ31 fine-grain layers were investigated. The alloy has a more obvious gradient microstructure when extruded at 350 °C. The nanoscale hardness value of Mg–1Sc alloy was improved through fine-grain strengthening and solution strengthening of the surface AZ31 fine-grain layer. The strength of Mg–1Sc alloy was improved due to the fine-grain strengthening and dislocation strengthening of the surface AZ31 fine-grain layer, and the elongation of Mg–1Sc alloy was increased by improving the distribution of the microstructure. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
- Full Text
- View/download PDF
39. Intercalation of Y in Mg-Al layered double hydroxide films on anodized AZ31 and Mg-Y alloys to influence corrosion protective performance.
- Author
-
Dai, Xu, Wu, Liang, Xia, Yu, Chen, Yanning, Zhang, You, Jiang, Bin, Xie, Zhihui, Ci, Wenjun, Zhang, Gen, and Pan, Fusheng
- Subjects
- *
MAGNESIUM alloys , *LAYERED double hydroxides , *RARE earth metal alloys , *CORROSION in alloys , *FOURIER transform infrared spectroscopy , *X-ray photoelectron spectroscopy , *EMISSION spectroscopy - Abstract
[Display omitted] • Yttrium-doped layered double hydroxide (LDH) films were firstly fabricated successfully in the coating field. • Large amounts of chloride ions in corrosion environment can trigger the stable emerge of Y ions from MgAlY-LDHs. • Anodized Mg-Y alloys composed of Y 2 O 3 are conducive to the in-situ growth of ternary LDHs. Yttrium-doped Mg-Al layered double hydroxide films (MgAlY-LDHs) were firstly fabricated by a hydrothermal method on anodized AZ31 and Mg-Y alloys. The structure, morphology, and composition of MgAlY-LDHs were characterized by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), X-ray fluorescence spectrometry (XRF), backscattered electron spectrometer (BSE), field-emission scanning electronic microscope (FE-SEM), energy dispersive spectrometry (EDS) and glow discharge optical emission spectroscopy (GDOES), respectively. The electrochemical behavior was investigated using polarization curves, electrochemical impedance spectroscopy (EIS), and immersion tests. The results indicated that the Y ions can be successfully intercalated in the MgAl-LDH lamella by isomorphous replacement, which can enhance corrosion protective performance and possess the self-healing ability of coatings. Furthermore, the in-situ growth of ternary LDHs film on high-strength Mg-rare earth (RE) alloys demonstrated the considerable potential of anti-corrosion protection for industrial application. The schematic representation of the growth mechanism and electrochemical behavior of MgAlY-LDHs nanosheet was put forward finally. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
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40. One-step in situ synthesis of graphene oxide/MgAl-layered double hydroxide coating on a micro-arc oxidation coating for enhanced corrosion protection of magnesium alloys.
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Chen, Yanning, Wu, Liang, Yao, Wenhui, Zhong, Zhiyong, Chen, Yonghua, Wu, Jiahao, and Pan, Fusheng
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MAGNESIUM alloy corrosion , *HYDROXIDES , *X-ray photoelectron spectroscopy , *COMPOSITE coating , *ALUMINUM silicates , *MAGNESIUM alloys , *SURFACE coatings , *ALUMINUM-zinc alloys - Abstract
The preparation of excellent anti-corrosion coatings is necessary for practical large-scale applications. In this study, a micro-arc oxidation (MAO) coating was prepared on the AZ31 magnesium alloy in advance. Then, on the basis of the MAO coating, the graphene oxide (GO)/MgAl-layered double hydroxide (MgAl-LDH) composite was prepared by hydrothermal chemical transformation in pure GO solution with the mixed oxide of aluminum and magnesium in the MAO coating as the endogenous cation, without introducing any kind of salts. The chemical states, structural composition and morphology of the GO/LDH-MAO coating were confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The potentiodynamic polarization revealed that 0.1 GO/LDH-MAO coating (3.89 × 10−9 A/cm2) is more resistant to corrosion than MAO coating (9.89 × 10−6 A/cm2) in 3.5 wt% NaCl solution. The organic combination of Mg Al LDH and GO can obviously enhance the corrosion protection ability of the coating. This research explored in detail the possible corrosion protection mechanisms regarding GO/LDH-MAO coatings, which supplied the feasibility for enhancing the anti-corrosion performance of MAO coating. [Display omitted] • GO and LDH composite coating (GO/LDH) was built on MAO coating of AZ31 magnesium alloy. • GO/LDH-MAO coating improved the corrosion protection performance of AZ31 magnesium alloy in 3.5 wt% NaCl solution. • GO and LDH play a synergistic role in the corrosion protection of GO/LDH-MAO coatings. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
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41. Improved corrosion resistance of AZ31 Mg alloy coated with MXenes/MgAl-LDHs composite layer modified with yttrium.
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Wu, Yulong, Wu, Liang, Yao, Wenhui, Jiang, Bin, Wu, Jiahao, Chen, Yanning, Chen, Xiao-bo, Zhan, Qin, Zhang, Gen, and Pan, Fusheng
- Subjects
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COMPOSITE coating , *CORROSION resistance , *YTTRIUM , *ALUMINUM-magnesium alloys , *YTTRIUM aluminum garnet , *MAGNESIUM alloys , *ALLOYS , *COMPOSITE structures - Abstract
MXenes, a novel two-dimensional (2D) material of Ti 3 C 2 , present wide applications in energy-related fields. However, a mass of sedimentary multilayer Ti 3 C 2 was discarded and non-recyclable due to incomplete exfoliation in the preparation of single layer Ti 3 C 2. In this work, a composite structure, mixing MXenes/magnesium aluminum-layered double hydroxides (MXenes/MgAl-LDHs) with Y(OH) 3 , was synthesized in-situ as a smart coating on Mg alloy AZ31 via (i) exfoliating those multilayer Ti 3 C 2 to few-layer MXenes (FLMs), and (ii) adding Y(NO 3) 3 to FLMs solution for a one-step hydrothermal treatment. Results show the electronegative mainboard of MXenes can effectively absorb cations in the reaction solution, and promote growth of MgAl-LDHs and Y(OH) 3 on its surface. Moreover, MgAl-LDHs being the intermediate connector facilitate growth of MXenes upon the surface of Mg alloy AZ31. The corrosion tests indicated that the composite coating modified with yttrium had an excellent anticorrosion performance (E corr = −0.36 V SCE , I corr = 9.12 × 10−9 A cm−2) and self-healing ability. Further, the formation and corrosion mechanism of composite coatings were finally proposed. Image, graphical abstract [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
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42. Significant roles of minor Mg addition in microstructural evolution and mechanical properties of cast Al–3Li–2Cu-0.15Zr alloy.
- Author
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Wu, Liang, Li, Xianfeng, and Wang, Haowei
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MAGNESIUM alloys , *PRECIPITATION hardening , *ALUMINUM-lithium alloys , *ATOM-probe tomography , *ALUMINUM alloys , *ALLOYS , *LITHIUM alloys , *TRANSMISSION electron microscopes - Abstract
The impact of minor Mg addition on microstructure and mechanical properties of cast Al–Li–Cu–Zr alloy with high lithium content (3 wt % Li) were studied to understand a qualitative assessment of sequence and kinetics of multiple precipitations and its effect on mechanical properties. Scanning Electron Microscope and X-ray diffraction results suggested that raising the content of Mg gradually altered the grain structure of the as-cast alloys and increased the types and volume fraction of the grain boundary intermetallic phase. Unusually, solvus temperature is higher than solidus temperature in 0.5 Mg alloy (Al–3Li–2Cu-0.5Mg-0.15Zr, wt. %), resulting in the incipient melting of the matrix before the complete dissolution of the intermetallic phases. Prominent enhancements in both age-hardening and precipitation kinetics of the base alloy with the addition of Mg were also easily identified, indicating the important role of Mg during isothermal aging. Transmission Electron Microscope and atom probe tomography results showed that minor Mg addition (0.2 wt %, denoted by 0.2 Mg alloy) could encourage the diffusion of Cu atoms by the aggregation of Mg–Cu-vacancy co-clusters, thereby promoting the nucleation of the T 1 -Al 2 CuLi and θ′-Al 2 Cu precipitates. In addition, S′-Al 2 CuMg precipitate was therefore introduced as a result of Mg addition. With further increasing the content of Mg to 0.5 wt %, the nucleation and growth of S′ precipitate would be promoted at the expense of T 1 and θ′ precipitates, especially the latter. Based on the theoretical models and regression analysis, the formation mechanism of δ′-Al 3 Li precipitate-free-zones gradually changed from the initial vacancy-depletion mechanism to the solute-depletion mechanism, and Mg element could significantly inhibit the coarsening of δ′ precipitate-free-zones. The best balance between ductility and strength was obtained by 0.2 Mg alloy aged for 32 h, and the alloys have significant advantages in terms of density (2.437 g/cm3) and elastic modulus (82.65 GPa) over conventional cast aluminum alloys (density: 2.7–2.8 g/cm3; elastic modulus: 72 GPa). • Effects of Mg on the microstructure and properties of cast Al–3Li–2Cu (wt.%) alloy are reported for first time. • Remarkable improvements in both precipitation kinetics and age-hardening of Mg-bearing alloys are observed. • The precipitation sequence and precipitation behavior of the alloys are extremely sensitive to the content of Mg. • The formation mechanism of δ′-PFZ changes from the initial vacancy-depletion mechanism to solute-depletion mechanism. • The studied alloys have significant advantages in terms of density and elastic modulus over conventional cast Al alloys. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
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43. Effect of Microstructure on Layered Double Hydroxides Film Growth on Mg-2Zn- x Mn Alloy.
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Chen, Yonghua, Yao, Wenhui, Wu, Liang, Chen, Jing, and Pan, Fusheng
- Subjects
LAYERED double hydroxides ,ALLOYS ,MICROSTRUCTURE ,CORROSION & anti-corrosives ,CORROSION resistance ,MAGNESIUM alloys ,MANGANESE alloys - Abstract
The poor corrosion resistance of magnesium (Mg) alloys significantly restricts their wide applications. The preparation of a layered double hydroxides (LDHs) film can provide effective corrosion protection for Mg alloys. Nevertheless, research on the effect of the Mg alloy microstructure on LDHs film growth is paid less attention, which was studied in detail in this work. Herein, a Mg-2Zn-xMn alloy with different Mn contents was produced, and an LDHs film was then synthesized on their surfaces. The addition of Mn causes a different microstructure in the Mg-2Zn-xMn alloy, which is gradually refined with increasing Mn content, further affecting the surface morphology, surface chemistry, and corrosion protection of the LDHs film. When the Mn content is 1 wt.% (x = 1), the LDHs film presents the best corrosion protection, with the lowest corrosion current density. No obvious corrosion product could be observed by the naked eyes on the surface. By contrast, severe corrosion occurs on the Mg-2Zn-0Mn alloy (x = 0). Finally, the LDHs film growth mechanism was proposed. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
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44. Microstructure and chemistry of the composite precipitate structure in Al-Li-Cu alloy.
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Wu, Liang, Li, Xianfeng, and Wang, Haowei
- Subjects
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COMPOSITE structures , *PRECIPITATION (Chemistry) , *MAGNESIUM alloys , *SCANNING transmission electron microscopy , *MICROSTRUCTURE , *THREE-dimensional imaging - Abstract
• Two types of the composite precipitate structure were observed. • The microstructure and chemistry of this structure were accurately characterized. • The coarsening of the inward T 1 may would be depressed by the sideward δ′. A combination of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) imaging and three-dimensional atom probe analyses (3DAP) technologies was employed to accurately characterize the composite precipitate structure. Two types of the composite precipitate structure, i.e. δ′/T 1 and δ′/T 1 /δ′ (T 1 -Al 2 CuLi and δ′-Al 3 Li), were observed. 3DAP analysis further confirmed the existence of this structure and solutes distribution was precise determined by concentration profiles. We also found that the coarsening of T 1 was achieved by the nucleation of precursor on one side of matured T 1 precipitate uncovered by δ′ precipitate and the coarsening of the inward T 1 precipitate within the composite structure may would be depressed by the sideward δ′ precipitate. [ABSTRACT FROM AUTHOR] more...
- Published
- 2020
- Full Text
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45. Microstructure and corrosion behavior of Mg-Sc binary alloys in 3.5 wt.% NaCl solution.
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Zhang, Cheng, Wu, Liang, Liu, Han, Huang, Guangsheng, Jiang, Bin, Atrens, Andrej, and Pan, Fusheng
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BINARY metallic systems , *MICROSTRUCTURE , *CORROSION resistance , *MAGNESIUM alloys - Abstract
• Sc has a significant effect of refining grains of pure Mg. • Mg-Sc binary alloys show single-phase microstructure for Sc concentrations between 0.1−0.3 wt.%. • There are Mg-Sc precipitates in Mg-Sc binary alloys for higher Sc concentrations (0.5–1.5 wt.%). • The Sc additions obviously improve the corrosion resistance of pure Mg. • The corrosion rates of the Mg-Sc alloys firstly decrease and then increase with increasing Sc concentration. This paper studied the microstructure and corrosion behavior of Mg-xSc binary alloy (x = 0.1–1.5 wt.%) sheets. Sc has a significant effect of refining grains of Mg. The Mg-Sc binary alloys had a single-phase microstructure for Sc concentrations between 0.1−0.3 wt.%, while there were Mg-Sc precipitates for higher Sc concentrations. The Sc additions obviously improved the corrosion resistance of pure Mg due to the refinement of microstructure and the formation of a more protective corrosion products film. The corrosion rate firstly decreased and then increased with increasing Sc concentration. Mg-0.3Sc has the lowest corrosion rate. [ABSTRACT FROM AUTHOR] more...
- Published
- 2020
- Full Text
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46. Effect of microalloyed Ca on the microstructure and corrosion behavior of extruded Mg alloy AZ31.
- Author
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Zhang, Cheng, Wu, Liang, Huang, Guangsheng, Huang, Yu, Jiang, Bin, Atrens, Andrej, and Pan, Fusheng
- Subjects
- *
MICROSTRUCTURE , *ALLOYS , *GRAIN size , *MAGNESIUM alloys , *ELECTRON microscopy , *MICROSCOPY , *ELECTROLYTIC corrosion - Abstract
The present work investigated the effect of microalloyed Ca on the microstructure and corrosion properties of extruded Mg alloy AZ31. The microstructure and corrosion behaviors were examined using optical and electron microscopies, immersion tests and electrochemical measurements. The grain size of AZ31 was refined by the addition of Ca and complete recrystallization occurred in AZ31-0.2Ca which had fine uniform grains. AZ31–0.05Ca showed a small number of Mg–Al–Ca phase particles, which may lead to severe microgalvanic corrosion and a higher corrosion rate than AZ31. AZ31-0.1Ca and AZ31-0.2Ca possess many dispersed fine Al 2 Ca phase particles, which could be beneficial to form continuous corrosion products and a more protective corrosion products film. Thus, AZ31-0.1Ca and AZ31-0.2Ca had a somewhat lower corrosion rate than AZ31. • Effects of microalloying addition of Ca on corrosion behavior of extruded AZ31 were studied. • The microstructure of AZ31 was refined by alloying of Ca and complete recrystallization occurred in AZ31-0.2Ca. • AZ31-0.05Ca had a higher corrosion rate than AZ31, which may attribute to severe microgalvanic corrosion. • AZ31-0.1Ca and AZ31-0.2Ca had a lower corrosion rate due to the modified microstructure and a more protective corrosion film. [ABSTRACT FROM AUTHOR] more...
- Published
- 2020
- Full Text
- View/download PDF
47. Effect of solution pH value on the corrosion resistance of Co-Fe LDHs coating developed on MAO treated magnesium alloy AZ31.
- Author
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Chen, Yonghua, Li, Jiaxin, Wu, Liang, Zhang, Yuhan, Deng, Jiahao, Yao, Wenhui, Wu, Jiahao, Yuan, Yuan, Xie, Zhihui, Atrens, Andrej, and Pan, Fusheng
- Subjects
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MAGNESIUM alloys , *CORROSION resistance , *PH effect , *SURFACE coatings , *CORROSION in alloys , *ALLOYS - Abstract
As a post-treatment method of MAO coating, layered doubled hydroxides (LDHs) can improve the corrosion/degradation resistance of magnesium (Mg) alloys. This study innovatively prepared Co-Fe LDHs coatings on MAO treated Mg alloy AZ31, and investigated the effect of pH value on the corrosion/degradation resistance of the coatings. The results indicate that the corrosion/degradation resistance of LDHs coatings first increase and then decrease with the increase of pH. The best corrosion/degradation resistance occurred for pH = 12, with a corrosion current density (i corr) of 5.18×10–8 A∙cm–2. The i corr after immersing in NaCl solution for 14 days was 1.65×10–6 A∙cm–2. The Co-Fe LDHs nanosheets (pH = 12) effectively sealed the pores of the MAO coating, resulting in increased coating density and hindering the diffusion of corrosive media, thereby effectively protecting the Mg alloy. This study is of great significance for the corrosion protection and rapid degradation prevention of Mg alloys and other alloys. [Display omitted] • The Co-Fe LDHs coatings with different pH conditions were prepared on MAO treated Mg alloy AZ31. • The Co-Fe LDHs nanosheets successfully sealed the pores of the MAO coating. • As the pH value increased, the corrosion/degradation resistance of the LDHs coatings first increased and then decreased. • The Co-Fe LDHs coating endowed Mg alloys with good corrosion/degradation resistance. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
48. Corrigendum to "Cerium nitrate and stearic acid modified corrosion-resistant micro-arc oxidation coating on magnesium alloy" [Surf. Coat. Technol. 478 (2024) 130461].
- Author
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Liu, Yan, Yong, Qiwen, Wu, Liang, Yu, Gang, and Xie, Zhi-Hui
- Subjects
- *
STEARIC acid , *CERIUM oxides , *CERIUM , *MAGNESIUM alloys , *SURFACE coatings , *OXIDATION , *NITRATES - Published
- 2024
- Full Text
- View/download PDF
49. In-situ grown super- or hydrophobic Mg-Al layered double hydroxides films on the anodized magnesium alloy to improve corrosion properties.
- Author
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Zhang, Gen, Tang, Aitao, Wu, Liang, Zhang, Zeyu, Liao, Hongxin, Long, Ying, Li, Lingjie, Atrens, Andrej, and Pan, Fusheng
- Subjects
- *
LAYERED double hydroxides , *MAGNESIUM alloy corrosion , *ALUMINUM-zinc alloys , *MAGNESIUM alloys , *IMPEDANCE spectroscopy - Abstract
Abstract Mg-Al layered double hydroxides (LDHs) were deposited on the anodized magnesium alloy AZ31 via an easy in-situ method, and the surfaces of MgAl-LDHs were modified with myristic acid (MA) and 1H, 1H, 2H, 2H-Perfluorodecyltrimethoxysilane (PFDTMS). The obtained results showed that LDHs with the biggest flakes were preferential sites for absorption of MA, while unfavorable for the adsorption of PFDTMS. All of films modified with MA were superhydrophobic. The corrosion behavior of the AZ31 with modified LDH films was evaluated using hydrogen collection, electrochemical impedance spectroscopy (EIS), polarization potentiodynamic curves and the immersion tests. The superhydrophobic films considerably improved the corrosion performance of the LDH films on the AZ31 substrate. Highlights • LDHs were prepared on anodized AZ31, and then these surfaces were modified with MA and PFDTMS. • LDHs with the biggest flakes were preferential sites for absorption of MA, while unfavorable for the adsorption of PFDTMS • The superhydrophobic films considerably improved the corrosion performance of AZ31 substrate. [ABSTRACT FROM AUTHOR] more...
- Published
- 2019
- Full Text
- View/download PDF
50. Cerium nitrate and stearic acid modified corrosion-resistant micro-arc oxidation coating on magnesium alloy.
- Author
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Liu, Yan, Yong, Qiwen, Wu, Liang, Yu, Gang, and Xie, Zhi-Hui
- Subjects
- *
STEARIC acid , *CERIUM oxides , *MAGNESIUM alloys , *CERIUM , *PROTECTIVE coatings , *SURFACE coatings , *OXIDATION - Abstract
This paper aims to overcome the adverse influence of intrinsic micropores and microcracks in the micro-arc oxidation (MAO) layer by creating a hydrophobic cerium-based conversion top layer through a vacuum-assisted post-treatment. The electrochemical results reveal that the corrosion current density (j c) and impedance modulus at the low-frequency region of the duplex protective coating system are significantly lower and higher than that of the bare magnesium alloy and MAO coating without modification. The unprecedentedly low j c and high impedance of the as-prepared coating are attributed to the notable improvement in hydrophobicity, sealing effect to micropores, and self-healing function of the outer cerium-based film. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
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