Metal protective coating compositions, their preparation and use

Details Metal protective coating compositions, their preparation and use Metal protective coating compositions, their preparation and use

1972-10-25

1976-10-12

Welsh, John D.

Metal treatment

Compositions

Heat treating

148 315, C23C 1100

Patent

active

039855848

ABSTRACT:
Disclosed is an acid, aqueous metal surface treating composition comprising chromium phosphate, chromic acid, a phosphate ion providing compound and a polyvinyl alcohol polymer hydrolyzed to at least 99%. Also present is a phosphate of a water soluble amine.

REFERENCES:
patent: 2737498 (1956-03-01), Frasch
patent: 3175964 (1965-03-01), Watanabe et al.
patent: 3189489 (1965-06-01), Schiffman
Schildknecht, Vinyl and Related Polymers, Wiley & Sons, (1956), p. 345.

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