Abstract
A water-based epoxy silane and titanium/zirconium composite chemical conversion coating was prepared on the surfaces of 6061 aluminum alloy, 7075 aluminum alloy, and galvanized steel simultaneously. Our findings revealed that the composite chemical conversion coating exhibited the strongest anti-corrosion effect on multi-metals surfaces as the concentration of silane was 0.4 vol% and the conversion time was 90 s. The analysis showed that a notable deposition of TiO2 and ZrO2 in close proximity to intermetallic compounds, segregation phases enriched with copper, and inclusions. Notably, the formation of the composite chemical conversion coatings on the multi-metals surface primarily follows a synergistic mechanism involving adsorption, oxidation, and readsorption. Consequently, a crosslinked siloxane network structure is formed, which offers additional filling sites for surplus particles of Al2O3, TiO2, ZrO2, and Fe2O3.
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