Abstract
Chemical conversion coatings can improve both anti-corrosion and adhesion properties in a wide range of applications. Due to the environmental and health issues of traditional chromate and phosphate coatings, more research has been carried out to develop environment-friendly and cost-effective chemical conversion coating. In this study, the coating formation mechanism of zirconium-based conversion coating and zirconium-polymer-based hybrid coating applied on carbon steel has been investigated. For zirconium-based coating, the kinetics of coating formation was characterized by the growth of the cluster size, as assessed by high-resolution SEM imaging; the evolution of the chemical composition was studied by Synchrotron X-ray Absorption Near Edge Spectroscopy (XANES) and X-ray Photoelectron Spectroscopy (XPS). Furthermore, the processing-structure-property correlation of an improved zirconium-based organic-inorganic “hybrid” coating was investigated. In both systems, corrosion tests have been carried out to understand the potential effects of post-coating processes. Overall, the study sheds light on the mechanism of the zirconium-based and hybrid coating formation, advancing the development of novel anti-corrosion technologies.
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