Chromium-free passivate solution and process

Details Chromium-free passivate solution and process Chromium-free passivate solution and process

1981-04-16

1982-11-16

Hoffman, James R.

Metal treatment

Compositions

Heat treating

148 624, C23F 900, C23F 700

Patent

active

043593470

ABSTRACT:
An aqueous acidic solution and process for treating receptive metal surfaces, particularly zinc and zinc alloy surfaces, to impart a passivate film thereon imparting improved corrosion resistance thereto. The aqueous solution contains effective amounts of hydrogen ions to provide a pH of about 1.2 to about 2.5, an oxidizing agent and a combination of iron and cobalt ions present in an amount effective to activate the bath and promote the formation of a passivate film on the metal substrate. The treating solution may optionally further contain cerium ions present in an amount to further activate the bath and to impart a light-yellow color to the passivate film, halide ions and a wetting agent.

REFERENCES:
patent: 3852124 (1974-12-01), Fassell

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