POSCO Holdings Inc.
PLATED STEEL MATERIAL HAVING EXCELLENT ADHESION TO PLATING AND CORROSION RESISTANCE, AND MANUFACTURING METHOD FOR SAME

Abstract:

A Zn--Mg alloy plated steel material having excellent adhesion to plating and corrosion resistance comprises base steel and a plating layer formed on the surface of the base steel, wherein the plating layer comprises a Zn single phase, a Mg single phase, an MgZn.sub.2 alloy phase, and an Mg.sub.2Zn.sub.11 alloy phase, the Zn single phase is contained in the plating layer at a proportion of 15 to 19 volume %, and the proportion of the Zn single phase in a lower t/2 area of the plating layer adjacent to the base steel may be greater than the proportion of the Zn single phase in an upper t/2 area of the plating layer on the surface layer side of the plating layer. (Here, t means the thickness (.mu.m) of the plating layer).