C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/22
C25D 5/12 (2006.01) B23K 35/00 (2006.01) B23K 35/22 (2006.01) C25D 5/10 (2006.01) C25D 5/50 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1240949
ABSTRACT OF THE DISCLOSURE Surface-treated steel strips suitable for electric resistance welding are prepared by forming a first layer of iron-nickel alloy on a steel strip, said first layer having a weight ratio of Ni/(Fe + Ni) in the range between 0.02 and 0.50 and a thickness of 10 to 5,000 angstroms, forming a second layer of tin or iron-tin-nickel alloy on said first layer by tin plating to a coating weight of 0.1 to 1 g/m2 of tin and optionally, causing the tin to reflow, and forming a third layer on said second layer by effecting an electrolytic chromate treatment, said third layer consisting essentially of metallic chromium and hydrated chromium oxide in a total amount of 5 to 20 mg/m2 calculated as elemental chromium. More preferably, the electrolytic chromate treatment is controlled such that at least 2 mg/m2 of metallic chromium is present in the third layer.
458141
Ichida Toshio
Irie Toshio
Mochizuki Kazuo
Nakakoji Hisatada
Ogata Hajime
Kawasaki Steel Corporation
Moffat & Co.
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