Hot-dipped galvanized steel sheet having excellent black tarnish

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

1985-05-16

1987-05-05

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

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

428659, B32B 1504

Patent

active

046632450

ABSTRACT:
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/m.sup.2 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/l 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/m.sup.2 on the zinc or zinc alloy plating layer of the sheet, optionally followed by chromating in the usual manner.

REFERENCES:
patent: 3816082 (1974-06-01), Austin et al.
patent: 4500610 (1985-02-01), Gunn et al.

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