Composition for forming chromate coating

Details Composition for forming chromate coating Composition for forming chromate coating

1978-05-01

1978-11-21

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 62, C23F 726

Patent

active

041264908

ABSTRACT:
Compositions for forming chromate coatings on zinc metal or zinc alloys typically contain water as a solvent with hexavalent chromium compounds therein as active ingredients. Such hexavalent chromium compounds are environmentally undesirable. An aqueous composition for forming a chromate coating on zinc metal or zinc alloys is provided which does not contain hexavalent chromium compounds. The composition contains a trivalent chromium compound, an alum and a vanadate.

REFERENCES:
patent: 3053693 (1962-09-01), Schuster et al.
patent: 3066055 (1962-11-01), Pimbley
patent: 3391031 (1968-07-01), Russell et al.
patent: 3397090 (1968-08-01), Champaneria et al.
patent: 3501352 (1970-03-01), Shah
patent: 3808057 (1974-04-01), Labenski et al.
patent: 3857739 (1974-12-01), Prust et al.
patent: 3895969 (1975-07-01), Miller
patent: 3907610 (1975-09-01), Yamagishi et al.
patent: 4036667 (1977-07-01), Simon

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