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7 results on '"Shuanglu Duan"'

1. Anodic electrochemical behaviors of Inconel 718 and Rene 65 alloys in NaNO3 solution

Author

Shuanglu Duan, Jia Liu, Jingtao Wang, Bo Tang, and Di Zhu

Subjects
Electrochemical machining, Anodic electrochemical behavior, Inconel 718 alloy, Rene 65 alloy, Morphology of dissolution, Mining engineering. Metallurgy, TN1-997
Abstract

Studying the behavior of anode materials during their electrochemical dissolution is the premise for and key to their electrochemical machining (ECM). In this study, electrochemical tests and ECM experiments on the Inconel 718 (IN718) and Rene 65 (R65) alloys in a 20 wt% NaNO3 solution were conducted to investigate their behaviors during anodic electrochemical dissolution. The passivation-related behaviors and structures of the interface of the two materials were measured based on the curves of potentiodynamic polarization and EIS. Information on the growth and composition of the passive film was obtained by potentiostatic polarization and XPS. The results showed that compared with IN718, the structure of the passive film on the surface of R65 was loose and unstable such that it had a weak resistance to corrosion. ECM tests were performed under different current densities, and the morphology of dissolution was identified. The grain boundaries of IN718 were completely exposed in the dissolved surface, and it had a lower surface roughness than R65. For R65, a high current density was conducive to the removal of blocky protrusions and lath structures. Finally, a model of dissolution is proposed to characterize the behaviors of IN718 and R65 during electrochemical dissolution.

Published
2023
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5. Electrochemical Corrosion Behavior of Ni-Fe-Co-P Alloy Coating Containing Nano-CeO2 Particles in NaCl Solution

Author

Wenke Ma, Jinran Lin, Xiuqing Fu, Shuanglu Duan, and Qingqing Wang

Subjects
Ni-Fe-Co-P-CeO2 composite coating, Materials science, Scanning electron microscope, Energy-dispersive X-ray spectroscopy, engineering.material, lcsh:Technology, electrochemical corrosion behavior, Article, Corrosion, Coating, corrosion mechanism, General Materials Science, scanning electrodeposition, Polarization (electrochemistry), lcsh:Microscopy, lcsh:QC120-168.85, Tafel equation, lcsh:QH201-278.5, lcsh:T, Amorphous solid, Dielectric spectroscopy, Chemical engineering, lcsh:TA1-2040, engineering, lcsh:Descriptive and experimental mechanics, lcsh:Electrical engineering. Electronics. Nuclear engineering, lcsh:Engineering (General). Civil engineering (General), lcsh:TK1-9971
Abstract

In order to study the effect of nano-CeO2 particles doping on the electrochemical corrosion behavior of pure Ni-Fe-Co-P alloy coating, Ni-Fe-Co-P-CeO2 composite coating is prepared on the surface of 45 steel by scanning electrodeposition. The morphology, composition, and phase structure of the composite coating are analyzed by means of scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The corrosion behavior of the coatings with different concentrations of nano-CeO2 particles in 50 g/L NaCl solution is studied by Tafel polarization curve and electrochemical impedance spectroscopy. The corrosion mechanism is discussed. The experimental results show that the obtained Ni-Fe-Co-P-CeO2 composite coating is amorphous, and the addition of nano-CeO2 particles increases the mass fraction of P. With the increase of the concentration of nano-CeO2 particles in the plating solution, the surface flatness of the coating increases. The surface of Ni-Fe-Co-P-1 g/L CeO2 composite coating is uniform and dense, and its self-corrosion potential is the most positive, the corrosion current and corrosion rate are the smallest, and the charge transfer resistance is the largest, showing the best corrosion resistance.

Published
2019

6. Effect of Current Density on the Performance of Ni–P–ZrO2–CeO2 Composite Coatings Prepared by Jet-Electrodeposition

Author

Shuanglu Duan, Zhaoyang Song, Qingqing Wang, Jinran Lin, Xiuqing Fu, Hongwen Zhang, and Moqi Shen

Subjects
Diffraction, jet-electrodeposition, current density, Jet (fluid), Materials science, Scanning electron microscope, composite coatings, Composite number, CeO2 nanoparticles, Surfaces and Interfaces, Surfaces, Coatings and Films, Corrosion, lcsh:TA1-2040, ZrO2 nanoparticles, Materials Chemistry, Composite material, Current (fluid), lcsh:Engineering (General). Civil engineering (General), Spectroscopy, Current density
Abstract

The objective of this study was to improve the surface properties, hardness, wear resistance and electrochemical corrosion resistance of #45 steel. To this end, Ni&ndash, P&ndash, ZrO2&ndash, CeO2 composite coatings were prepared on the surface of #45 steel using the jet-electrodeposition technique by varying the current density from 20 to 60 A/dm2. The effect of current density on the performance of the composite coatings was evaluated. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) were applied to explore the surface topography, elemental composition, hardness and electrochemical corrosion resistance of the composite coatings. The results showed that with the increase in the current density, the hardness, wear resistance, and electrochemical corrosion resistance tends to increase first and then decrease. At a current density of 40 A/dm2, the hardness reached a maximum of 688.9 HV0.1, the corrosion current reached a minimum of 8.2501&times, 10&minus, 5 A&middot, cm&minus, 2, and the corrosion potential reached a maximum of &minus, 0.45957 V. At these values, the performance of the composite coatings was optimal.

Published
2020
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7. Microstructure and Wear Resistance of a Ni–Fe–Co–P/CeO2 Composite Coating after Heat Treatment.

Author

Fu Xiuqing, Moqi, Shen, Jinran, Lin, Shuanglu, Duan, and Qingqing, Wang

Subjects
HEAT treatment, WEAR resistance, COMPOSITE coating, DISPERSION strengthening, INTERMETALLIC compounds, FLUX pinning
Abstract

To extend the service time of #45 steel, Ni–Fe–Co–P alloy coatings were prepared on workpieces. CeO2 nanoparticles were also added and a heat treatment was carried out. Both the addition of CeO2 nanoparticles and the heat treatment had a positive influence on the dispersion strengthening, the fine grain strengthening, and the pinning effect. The surface topography and the chemical composition of the coatings as well as the microstructure were analyzed by Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometry (EDS), and X-ray diffraction (XRD). The microhardness was tested with a Duramin-40 hardness tester. The wear resistance reflected by the wear mark was observed by a LEXT4100 laser confocal microscope The coating with the stable intermetallic compounds and the highest wear resistance were obtained for a CeO2 nanoparticles content of 1g/L and a heat treatment temperature of 400°C because the main phase is NiP3 and the wear mark is the smallest for these parameters. [ABSTRACT FROM AUTHOR]

Published
2020
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