C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
6/4
C23C 22/30 (2006.01) C23C 22/48 (2006.01) C23C 22/53 (2006.01)
Patent
CA 1236655
ABSTRACT OF THE DISCLOSURE An aqueous acidic peroxide-free solution and process for treating receptive metal surfaces to impart a chromium passivate film thereon containing chromium ions substantially all of which are present in the trivalent state, hydrogen ions to provide a pH of about 1.2 to about 2.5, nitrate ions as the essential oxidizing agent present in an amount sufficient to activate the hydrated trivalent chromium to form a chromate film on the substrate, and at least one additional metal ion selected from the group consising of iron, cobalt, nickel, molybdenum, manganese, aluminum, lanthanum, cerium, lanthanide mixtures as well as mixtures thereof present in an amount effective to activate the formation of the chromate passivate film. The aqueous acidic solution can optionally, and preferably further contain controlled amounts of sulfate ions, halide ions, organic carboxylic acids, a bath soluble and compatible silicate compound, and one or a combination of wetting agents to further enhance the characteristics of the passivity film produced. 29
458956
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Omi International Corporation
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