Non-ferricyanide chromate conversion coating for aluminum surfac

Details Non-ferricyanide chromate conversion coating for aluminum surfac Non-ferricyanide chromate conversion coating for aluminum surfac

1977-03-02

1979-03-27

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 627, C23F 726

Patent

active

041464109

ABSTRACT:
A composition, and method for using the composition in applying a conversion coating on aluminum and aluminum alloy surfaces, is disclosed. In the method of this invention an aluminum containing metal surface is contacted with a ferricyanide free aqueous acidic solution containing zinc, hexavalent chromium, fluoride, and molybdate ions. The coated metal surface shows inhanced resistance to corrosion and improved paint adhesion. The absence of ferricyanide in the composition promotes easier disposal of the spent solutions.

REFERENCES:
patent: 2948643 (1960-08-01), Pimbley
patent: 3113051 (1963-12-01), Pimbley
patent: 3130085 (1964-04-01), Otto
patent: 3404043 (1968-10-01), Dell
patent: 3404044 (1968-10-01), Russell

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