In recent years, chromate-free hot-dip galvanized steel sheet has been developed for reducing environmental pollution. Many studies on chromate-free coating have been reported. However, there are not many studies concerned with the effect of the surface condition of a zinc-coated layer on the performance of chromate-free hot-dipped galvanized steel sheet. This study revealed that aluminum oxide on the surface of a zinc-coated layer strongly affects the corrosion resistance of chromate-free coated hot-dipped galvanized steel sheet and adhesion between the zinc-coated layer and chromate-free coating.
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