POSCO Holdings Inc.
ZN-MG ALLOY PLATED STEEL MATERIAL HAVING EXCELLENT CORROSION RESISTANCE AND PLATING ADHESION

Abstract:

Provided is a Zn--Mg alloy plated steel material comprising: a base steel material; and first to third Zn--Mg alloy layers sequentially formed on the base steel material, wherein the first to third Zn--Mg alloy layers have a Zn single phase, a Mg single phase, a MgZn.sub.2 alloy phase, and a Mg.sub.2Zn.sub.11 alloy phase, an area rate of the MgZn.sub.2 alloy phase included in the first to third Zn--Mg alloy layers is larger than an area rate of the Mg.sub.2Zn.sub.11 alloy phase included in the first to third Zn--Mg alloy layers, and an area rate of a MgZn.sub.2 alloy phase included in each of the first to third Zn--Mg alloy layers is larger than an area rate of a MgZn.sub.2 alloy phase included in the second Zn--Mg alloy layer.