Pre-treating zinciferous surfaces before conventional chromating

Details Pre-treating zinciferous surfaces before conventional chromating Pre-treating zinciferous surfaces before conventional chromating

1992-10-23

1997-09-16

Beck, Shrive

Coating processes

With pretreatment of the base

Preapplied reactant or reaction promoter or hardener

427318, 427328, 427405, 427436, 148267, 148268, B05D 304, C23C 2224

Patent

active

056678436

ABSTRACT:
The protection against black and white rust on zinciferous surfaces by a conventional chromating treatment is improved by drying into place on the zinciferous surface before chromating a pre-treatment composition that contains hexavalent chromium ion plus one or more salts of nickel and cobalt, in an amount to produce an add-on of 0.5 to 100 mg/m.sup.2 of metal.

REFERENCES:
patent: 3514343 (1970-05-01), Bauman
patent: 3954510 (1976-05-01), Gunn et al.
patent: 3990920 (1976-11-01), De Ridder et al.
patent: 4801337 (1989-01-01), Higgins
patent: 4840820 (1989-06-01), Schuitz et al.
patent: 5091223 (1992-02-01), Mori et al.

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