POSCO Holdings Inc.
ZN-NI ELECTROPLATED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE AND FORMABILITY AND MANUFACTURING METHOD THEREFOR

Abstract:

Provided is a Zn--Ni electroplated steel sheet having excellent corrosion resistance and formability and a manufacturing method therefor. The steel sheet includes: abase steel sheet; and a Zn--Ni plated layer formed on the base steel sheet, wherein a Ni alloying degree within the Zn--Ni plated layer is 7.5-14%, and the Ni amount is 40-50 atom % in a region within 1 pm toward the Zn--Ni plated layer from an interface of the base steel sheet and the Zn--Ni plated layer. Provided is a Zn--Ni electroplated steel sheet, which has superior corrosion resistance and formability despite having a relatively low nickel alloying degree, has excellent price competitiveness compared with that of a conventional Zn--Ni plated steel sheet and two-layer plated steel sheet, and can ensure high productivity.