Abstract
Three titanium-zirconium-phosphonate hybrid fllms were formed on AA6061 aluminum alloy by immersing in ∞uorotitanic acid and ∞uorozirconic acid based solution containing difierent phosphonic acids for protective coatings of aluminium alloy. The corrosion resistance of three hybrid fllms as the substitute for chromate fllm were evaluated and compared. The neutral salt spray test was explored, the immersion test was conducted and electrochemical test was also executed. The hybrid fllms exhibited well-pleasing corrosion resistance and adhesion to epoxy resin paints. It was found out that the hybrid fllms could e‐ciently be a substitute for chromate based primer over aluminium alloy.
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