Steel sheet with galvanic layers of zinc and of zine-iron

Details Steel sheet with galvanic layers of zinc and of zine-iron Steel sheet with galvanic layers of zinc and of zine-iron

C - Chemistry, Metallurgy

25

D

204/25

C25D 3/10 (2006.01) C25D 5/10 (2006.01)

Patent

CA 1124200

ELECTRO-GALVANIZED STEEL SHEET FOR COATING EXCELLENT IN BARE CORROSION RESISTANCE, CORROSION RESISTANCE AFTER COATING AND FORMABILITY ABSTRACT OF THE DISCLOSURE An electro-galvanized steel sheet for coating excellent in bare corrosion resistance, corrosion resistance after coating and formability, which comprises: a steel sheet; a first electro-galvanized layer, as a lower layer, in an amount of from 5 to 120 g/m2 per side, formed on at least one surface of said steel sheet, said first electro- galvanized layer comprising either an electro-galvanized layer consisting essentially of zinc or a compound electro- galvanized layer consisting essentially of zinc, cobalt and at least one of chromium,indium and zirconium; and a second electro-galvanized layer, as an upper layer, in an amount of from 0.2 to 10 g/m per side, formed on said first electro-galvanized layer, said second electro-galvanized layer consisting essentially of an alloy layer of zinc and from 1 to 60 wt.% iron. Said electro-galvanized steel sheet for coating is adapted to serve particularly for external, underside and closed structures of an automobile. - 1 -

338237

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