Hot-dipped galvanized steel sheet having excellent black...

Details Hot-dipped galvanized steel sheet having excellent black... Hot-dipped galvanized steel sheet having excellent black...

C - Chemistry, Metallurgy

23

C

117/117

C23C 18/32 (2006.01)

Patent

CA 1234318

ABSTRACT OF THE DISCLOSURE A zinc- or zinc alloy-hot-dipped, unpainted steel sheet having excellent black tarnish resistance, which has a coating of Ni, Co or a combination thereof deposited in an amount of from 0.1 to 15 mg/m2 on the zinc or zinc alloy plating layer of the sheet, and optionally a chromate layer on the deposited coating, is provided. The steel sheet is produced by immersing a zinc- or zinc alloy-hot-dipped steel sheet in an aqueous solution containing 1 to 20 g/? of Ni ions, Co ions or a combination thereof to deposit Ni, Co or a combination thereof in an amount of from 0.1 to 15 mg/m2 on the zinc or zinc alloy plating layer of the sheet, optionally followed by chromating in the usual manner.

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