Dual layer-coated electro-galvanized steel sheet for coating wit

Details Dual layer-coated electro-galvanized steel sheet for coating wit Dual layer-coated electro-galvanized steel sheet for coating wit

1979-10-22

1981-02-24

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

75178R, 148 12D, 204 35R, 204 40, 204 43Z, 427406, 4273839, 428926, 428935, B32B 1518, B32B 1500, C25D 510

Patent

active

042528666

ABSTRACT:
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/m.sup.2 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.sup.2 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.

REFERENCES:
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patent: 3986843 (1976-10-01), Adaniya et al.
patent: 4064320 (1977-12-01), Adaniya et al.
patent: 4125679 (1978-11-01), Mino et al.
patent: 4143210 (1979-03-01), Hyner et al.
patent: 4188459 (1980-02-01), Hyner et al.
patent: 4190504 (1980-02-01), Usui

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