METHOD FOR MANUFACTURING A ZN-MG ALLOY-COATED STEEL SHEET WITH EXCELLENT BLACKENING RESISTANCE AND EXCELLENT ADHESION

摘要

The present invention relates to a Zn-Mg alloy-coated steel sheet with excellent blackening resistance and excellent coating adhesion and to a method for manufacturing same. Provided are a Zn-Mg alloy-coated steel sheet with excellent blackening resistance and excellent adhesion and a method for manufacturing same, the steel sheet comprising: a substrate steel sheet; a Zn-Fe intermetallic compound layer formed on the substrate steel sheet; a first Zn-Mg coating layer formed on the Zn-Fe intermetallic compound layer and comprising a Zn-Fe intermetallic compound in which the content of Zn is 95 % by weight or higher; a second Zn-Mg coating layer formed on the first Zn-Mg coating layer and comprising a Zn-Mg intermetallic compound in which the content of On is 80 to 95 % by weight; and an oxide film formed on the second Zn-Mg coating layer and comprising a metallic oxide.