No-rinse pre-paint coating composition and method

Details No-rinse pre-paint coating composition and method No-rinse pre-paint coating composition and method

1979-02-09

1980-10-14

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 62, C23F 708, C23F 726

Patent

active

042279461

ABSTRACT:
An acid aqueous coating composition and concentrate of chromic acid and chromium phosphate derived from phosphoric acid resulting from the oxidation of hypophosphorous acid in reacting with the chromic acid. The chromic acid is present in a stoichiometrically equivalent amount from about one percent to about one hundred percent over that needed to oxidize hypophosphorous acid to phosphoric acid. The composition may also contain a non-foaming wetting agent and particulate silica.

REFERENCES:
patent: 2768104 (1956-10-01), Schuster et al.
patent: 3720549 (1973-03-01), Hirst

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