-- HOT DIP Zn-Al-Mg ALLOY PLATED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE AND METHOD FOR MANUFACTURING THE SAME

摘要

The present invention relates to a zinc-aluminum-magnesium alloy plated steel sheet excellent in corrosion resistance and a method of manufacturing the same. The hot-rolled steel sheet is shot blasted to remove the hot-rolled steel sheet and subjected to shot blasting to impart a compressive residual stress of -100 to -400 MPa Processing step; And a plating step of dipping the hot-rolled steel sheet in a zinc-aluminum-magnesium-based alloy plating bath to zinc-aluminum-magnesium plating, and also to provide a method of manufacturing a zinc- And a zinc-aluminum-magnesium-based alloy plating layer on the steel sheet. Corrosion products of Zn ₆ Al ₂ (CO ₃ ) (OH) ₁₆ · 4H ₂ O are formed near the interface of the plating layer under corrosive conditions, Zinc-aluminum-magnesium alloy-coated steel sheet.