Corrosion Resistance of Hot-Stamped Zinc-Coated Steel Sheet with a Coating Layer of the α-(Fe, Zn) Phase

The corrosion resistance of hot-stamped zinc-coated steel sheet with a coating layer of the -(Fe, Zn) phase is proposed based on the structural and electrochemical characterization of corrosion products.Goethite, lepidocrocite, akaganeite, and magnetite are the main corrosion products formed on the uncoated steel sheet.However, when the surface is coated with the -(Fe, Zn) phase, zinc ferrite is formed instead of magnetite in the inner layer of corrosion products.The formation of zinc ferrite is considered to suppress the cathodic reduction reactions of lepidocrocite and akaganeite, thereby enhancing the corrosion resistance of the steel sheet.