Trivalent chromium passivate solution and process

Details Trivalent chromium passivate solution and process Trivalent chromium passivate solution and process

1981-04-16

1982-11-16

Hoffman, James R.

Metal treatment

Compositions

Heat treating

148 621, C23F 900, C23F 726

Patent

active

043593453

ABSTRACT:
An aqueous acidic solution and process for treating metal surfaces, particularly zinc and zinc alloy surfaces, to impart improved corrosion resistance thereto. The solution contains effective amounts of chromium ions substantially all of which are in the trivalent state, hydrogen ions to provide a pH of about 1.5 to about 2.2, an oxidizing agent, iron ions in combination with at least one additional metal ion selected from the group consisting of cobalt, nickel, molybdenum, manganese, lanthanum and mixtures thereof. The treating solution may optionally further contain halide ions and a wetting agent.

REFERENCES:
patent: 4171231 (1979-10-01), Bishop et al.

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