Trivalent chromium passivate composition and process

Details Trivalent chromium passivate composition and process Trivalent chromium passivate composition and process

1981-06-15

1983-05-24

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 62, C23F 726, C23F 900

Patent

active

043849024

ABSTRACT:
An aqueous acidic solution and process for treating metal surfaces, particularly zinc and zinc alloy surfaces, for depositing a passivate film of improved clarity and hardness and 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 1.2 to about 2.5, an oxidizing agent, a bath soluble and compatible silicate compound present in an amount to provide improved corrosion protection to the substrate and increased hardness to the passivate film and at least one additional metal ion selected from the group consisting of iron, cobalt, nickel, molybdenum, manganese, aluminum, lanthanum, cerium, lanthanide mixtures as well as mixtures thereof. The treating solution may optionally further contain halide ions, a carboxylic acid or salt and a wetting agent.

REFERENCES:
patent: 2850415 (1958-09-01), Harrison
patent: 3421949 (1969-01-01), Halversen
patent: 3720549 (1973-03-01), Hirst et al.
patent: 3932198 (1976-01-01), Schneider
patent: 4171231 (1979-10-01), Bishop et al.

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