Improvement of the Abrasion and Corrosion Resistance of a Waterborne Epoxy Coating by α‑ZrP@PTA-Ce(III) with Dual Corrosion Inhibition Effects

• Published in: Langmuir Vol. 40; no. 39; pp. 20679 - 20691
• Main Authors: Ren, Wei, Gao, Qiuying, Guo, Yujie, Li, Changhua, Mao, Xiaoyu, Sun, Haijiao, He, Yi, Bai, Yang
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 01.10.2024
• ISSN: 0743-7463; 1520-5827; 1520-5827
• DOI: 10.1021/acs.langmuir.4c02758

The introduction of poly­(tannic acid) (PTA) and cerium ion [Ce­(III)] on the surface of α-zirconium phosphate (α-ZrP) endowed the α-ZrP@PTA-Ce­(III)/waterborne epoxy composite coating with enhanced corrosion protection and wear resistance performances. The successful preparation of α-ZrP@PTA-Ce­(III) was confirmed through X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectra. PTA improved the compatibility between α-ZrP@PTA-Ce­(III) and the waterborne epoxy resin due to the presence of organic groups from tannic acid. The wear resistance test indicated that the incorporation of α-ZrP@PTA-Ce­(III) effectively reduced the coefficient of friction and the wear rate. Electrochemical impedance spectroscopy was used to analyze the corrosion protection performance of unbroken coatings and the self-healing ability of scratched coatings. The incorporation of α-ZrP@PTA-Ce­(III) improved the protection performace distinctly. In addition, α-ZrP@PTA-Ce­(III) endowed the composite coating with dual corrosion inhibition effects, originating from the PTA film, to prevent the penetration of corrosive media and a dense film that came from the Ce­(III) cation. The waterborne epoxy system with enhanced corrosion and wear resistance in this paper broadens the application of α-ZrP.