Zn-Ni-SiO₂ Composite Coating from Sulfate Solution and Application of Silan Coupling Treatment

Abstract

The present study was carried out to fix the silane coupling agent on Zn-Ni-SiO₂ composite coatings for the purpose of the development of an alternative process for chromating. The corrosion resistance of Zn-Ni-SiO₂ composite coatings was remarkably improved in terms of the silica nanoparticles which uniformly dispersed in the film. Furthermore, silane coupling agents will form chemical bonds with inorganic silica particles by silane coupling treatment for these composite coatings, and suppress the formation of white corrosion products as well as the chromating in salt spray tests.