Hot-dipped galvanized steel sheet having excellent bending workability and corrosion resistance and manufacturing method therefor

Abstract

A hot-dipped galvanized steel sheet of the present invention includes: a base steel sheet; a Zn—Mg—Al based plating layer provided on at least one surface of the base steel sheet and including, in wt %, with respect to components other than iron (Fe) diffused from the base steel sheet, 5.1 to 25% of Al and 4.0-10% of Mg, and the remainder of Zn and other inevitable impurities; and an interfacial alloy layer having a Fe—Al—Zn composition formed between the base steel sheet and the plating layer, wherein the interfacial alloy layer has a thickness of 0.5-2 μm and has a dendritic form, the Zn—Mg—Al based plating layer has a Zn—Al—MgZn2 ternary eutectic structure, a Zn—MgZn2 binary eutectic structure, and a structure including one or more of an Al single-phase structure having solid-solubilized Zn and a Zn single-phase structure, and agglomerated Al is included in a MgZn2 structure.

Dependencies are inferred from the claim text.