HOT-DIP ZINC ALLOY COATED STEEL SHEET EXCELLENT IN COATING ADHESION, AND METHOD FOR PRODUCING THE SAME

摘要

[Problem] To produce a hot-dip Zn-Al-Mg alloy coatedsteel sheet that is excellent in coating adhesion, byusing, as a base sheet for coating, a steel sheet that isimparted with resistance to liquid metal embrittlementcracking by adding B.[Solution] A hot-dip zinc alloy coated steel sheetexcellent in coating adhesion containing at least one ofa Si simple oxide, a Mn simple oxide, a Cr simple oxide,a Si-Mn composite oxide, a Si-Cr composite oxide, a Mn-Crcomposite oxide, and a Si-Mn-Cr composite oxide in aportion within 10 µm from an interface between a steelsheet as a base sheet for coating, and a hot-dipgalvanized layer formed on a surface thereof.