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The nanocomposite BTA-SiO

In this work, a nanocomposite with active and passive corrosion protection performances was synthesized through a facile method. A metal organic framework (UIO-66) was chosen as the nanocontainer to encapsulate the corrosion inhibitor benzotriazole (BTA). Graphene oxide (GO) was utilized to act as a physical barrier. The active protection ability was achieved by two aspects. One is the pH-stimulated release of the loaded inhibitors from nanocontainers and the other is the passive film (ZrO2), which resulted from the disintegrated UIO-66 under alkaline conditions. The passive protection capacity was provided by the outstanding barrier property of GO.

Herein, a new strategy for improving anti-corrosion performance of epoxy coatings has been developed, which combined halloysite nanotubes (HNTs) with graphene oxide (GO). On one hand, the corrosion...

A nano-structured hybrid compound was fabricated with excellent corrosion inhibitor encapsulating capacity and the ability of controlled delivery of benzotriazole (BTA) for simultaneous enhancement of the hydrophobic property and corrosion resistance of epoxy coatings. The Ce-metal organic frameworks (Ce-MOF) were synthesized and served as nanocontainers, tetraethyl orthosilicate (TEOS) was further added to form a film to wrap Ce-metal organic frameworks. The addition of benzotriazole into nanocontainers endowed coating system with excellent anti-corrosion performance. The novelty lies in that the tetraethyl orthosilicate membrane would break and produce pores to release benzotriazole uniformly under acid condition, which was a pH-controlled self-healing process through polymer coatings providing an effective release of corrosion inhibitor. The fabricated hybrid compounds were comprehensively characterized with Fourier Transform infrared spectroscopy (FTIR), Ultraviolet–visible spectroscopy (UV-vis), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Electrochemical Impedance Spectroscopy (EIS) was performed to characterize the corrosion behavior of various composite coatings. Results indicated that the 3 wt.%Ce-metal organic frameworks incorporated into the epoxy coatings showed the most excellent anti-corrosion property.

In this work, a superhydrophobic MgAl-layered double hydroxide with F− intercalation (LDH-F) was fabricated by a facile method and further modification by stearate (St) anions. Then, the composite was dispersed in the epoxy resin to prepare anti-corrosion coatings, which was applied for corrosion protection of Mg alloy. This kind of coatings protects Mg alloy from some aspects. Firstly, the superhydrophobic film impedes the water molecules penetrating into Mg substrate. Secondly, the superior anions exchange ability of LDH can be used to stockpile chloride ions and the release of fluorine ions can react with magnesium ions to form a magnesium fluoride (MgF2) protective film at the corrosion area of the Mg alloy. Lastly, the LDH itself layered structure is a physical barrier. The fabricated composites were comprehensively characterized with Fourier Transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), water contact angle (CA) and scanning electron microscopy (SEM). Electrochemical Impedance Spectroscopy (EIS) was conducted to investigate the corrosion behavior of various composite coatings and the results demonstrated that the impedance modulus of the superhydrophobic layered double hydroxide epoxy (LDH-F-St-EP) coating reached 1.2 × 109 Ω cm2, showing excellent anti-corrosion performances.

A nanocomposite was fabricated with both excellent corrosion inhibitor encapsulating capacity and the ability of controlled delivery of benzotriazole (BTA) for simultaneously endowing coating systems with both active and passive anti-corrosion performances. The metal organic frameworks (MOFs) were synthesized and served as nanocontainers to load BTA. On this basis, tetraethyl orthosilicate (TEOS) was further added to form a film to wrap MOFs. The addition of TEOS endowed coatings with pH-responsive and active inhibition abilities, due to the film would break under acid or alkaline conditions. Moreover, the resultant compounds were further combined with graphene oxide (GO), cause GO had an superior barrier property and impermeability. On the other hand, there were abundant oxygen-containing functional groups on GO, which could be modified to improve the dispersion of GO in epoxy coatings. The fabricated nanocomposites were comprehensively characterized with Fourier Transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric Analysis (TGA), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Ultraviolet-visible spectroscopy (UV–vis) test was utilized to estimate the release behavior of BTA. Electrochemical Impedance Spectroscopy (EIS) was performed to characterize the corrosion behavior of various composite coatings. Results demonstrated that the BTA-MOF-TEOS-GO incorporated into the epoxy coatings showed the highest impedance values up to 8.6 × 108 Ω cm2, indicating the most excellent and durable anti-corrosion properties.

In this work, a multi-site adsorption inhibitor (DBI) was synthesized and characterized. The corrosion inhibition performance of symmetric benzyl lauric acid imidazoline quaternary ammonium salt under 1 M hydrochloric acid (HCl) condition was studied by weight loss test, potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS), SEM and XRD techniques. The experiment results have shown that the inhibition efficiency increases with an increase in an inhibitor concentration. Potentiodynamic polarization showed that this inhibitor is an anodic-type inhibitor. It is proved that the corrosion inhibitor has high surface properties and good adsorption performance on the surface of P110 steel through the contact angle and surface tension test. Furthermore, the adsorption of the corrosion inhibitor conforms to the Langmuir's adsorption isotherm on the surface of P110 steel.