Coating solutions of trivalent chromium for coating zinc surface

Details Coating solutions of trivalent chromium for coating zinc surface Coating solutions of trivalent chromium for coating zinc surface

1978-04-27

1979-10-16

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 62, C23F 726

Patent

active

041712315

ABSTRACT:
Aqueous acidic coating solutions are described for treating zinc or zinc alloy surfaces comprising trivalent chromium as substantially the only chromium ion present, fluoride ion, an acid other than nitric acid, and an oxidizing agent. The coating solutions containing trivalent chromium as substantially the only chromium ion present preferably are prepared by reducing an aqueous solution of hexavalent chromium with sufficient reducing agent to reduce all of the hexavalent chromium to trivalent chromium. Chromate coatings on zinc and zinc alloy surfaces are produced by contacting said surfaces with an aqueous acidic solution of the invention.

REFERENCES:
patent: 2559878 (1951-07-01), Johnson
patent: 3535168 (1970-10-01), Thompson
patent: 3932198 (1976-01-01), Schneider

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