ELECTRO-GALVANIZED STEEL SHEET WITH EXCELLENT UNSUSCEPTIBILITY TO STAIN

摘要

Provided are a chromate-free electro-galvanized steel sheet having excellent unsusceptibility to stain and a process for producing the sheet. The electro-galvanized steel sheet has a zinc deposit formed by electroplating and a resinous coating film formed thereon which contains substantially no chromium and 0.05-5 mass% sodium. The zinc deposit formed by electroplating contains, in terms of atomic amount, (A) 60-3,000 ppm Fe and (B) at least one element selected from the group consisting of Ni, Cr, Mo, Sn, Cu, Cd, Ag, Si, Co, In, Ir, and W, the element (B) comprising 60-6,000 ppm Ni, 0.5-5 ppm Cr, 5-500 ppm Mo, 0.6-20 ppm Sn, 8-3,000 ppm Cu, 0.0001-0.02 ppm Cd, 1.0-400 ppm Ag, 30-2,000 ppm Si, 0.0003-0.3 ppm Co, 0.1-30 ppm In, 0.01-10 ppm Ir, and 0.1-50 ppm W.