COMPOSITION FOR SURFACE TREATMENT OF MG-CONTAINING GALVANIZED STEEL SHEET AND MG-CONTAINING GALVANIZED STEEL SHEET SURFACE-TREATED USING SAME

Abstract: provided is a galvanized steel sheet including: a steel sheet comprising a galvanized layer; and a surface coating layer formed on the galvanized layer by using a composition which comprises a trivalent chromium compound, a carboxylated vinylidene copolymer, and a crosslinking agent. the galvanized layer includes mg.