Ce-loaded silica nanoparticles in the epoxy nanocomposite coating for anticorrosion protection of carbon steel

Abstract

Purpose This study aims to explore how the inhibitor-loaded nanocontainers can be used in the epoxy coating for protection of steel against corrosion. A self-healing anticorrosive coating can be easily fabricated by embedding the inhibitor-loaded nanocontainers into the epoxy coating matrices. For this purpose, first, cerium (a catholic corrosion inhibitor) is encapsulated into silica nanoparticles (SiO2@Ce). Thereafter, an epoxy nanocomposite coating has been prepared on steel substrate using these SiO2@Ce nanoparticles as nanofillers. Design/methodology/approach To examine the effect of SiO2@Ce nanocontainers on mechanical properties of epoxy coating, the abrasion resistance, impact resistance and adhesion strength of coating have been evaluated. To reveal the effect of SiO2@Ce nanocontainer on corrosion behavior of epoxy-coated steel, the electrochemical impedance spectroscopy (EIS) has been conducted in NaCl solution. Findings Transmission electron microscopy and scanning electron microscopy/Energy-dispersive X-ray spectroscopy analyses indicate that Ce3+ cations have been successfully loaded into the surface of silica nanoparticles (at the content of approximately 2 Wt.%). Mechanical tests of epoxy nanocomposite coatings indicate that the nanocomposite coatings with nanoparticles content of 2.5 Wt.% provide the highest values of abrasion resistance, impact resistance and adhesion strength. EIS results show that the presence of SiO2@Ce3+ nanocontainers increases both coating resistance and polarization resistance. Along with the improvement the coating barrier performance, Ce inhibitor plays an important role in improving the anticorrosive performance at the steel–electrolyte interface. Originality/value The application of self-healing epoxy/SiO2@Ce nanocomposite coatings for the protection of carbon steel is very promising.

Cerium dioxide modified with fumaric acid as corrosion inhibitor for epoxy coatings on Q235

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Surface-modified cerium oxide as a corrosion inhibitor to enhance the performance of epoxy coatings

“…After 60 days, the Nyquist plot showed significant double capacitive arcs and the Bode phase angle plot presented two time constants. The appearance of the capacitive arc in the low-frequency phase suggests that corrosion has occurred, indicating that electrolyte has initiated electrochemical reaction at the substrate interface (Nguyen et al , 2022). The chemical bond between the coatings and the substrate has been reduced or broken, resulting in a reduction in the protective effect of the coating.…”

Effects of nano-SiO2 and trivalent chromium conversion on corrosion resistance of NiZn-plated steel: towards a multilayer coating for steel protection

“…In fitting software, Q stands for CPE in EEC code. CPE has been used widely for fitting EIS data of coated metals in NaCl solution (Xia et al , 2022; Pan et al , 2020; Nguyen et al , 2022). As shown in Table 4, the C dl value of our ZnNi sample was 0.28 mF.cm −2 in NaCl solution.…”