Coating compositions and method for the treatment of metal surfa

Details Coating compositions and method for the treatment of metal surfa Coating compositions and method for the treatment of metal surfa

1983-10-03

1984-09-11

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 627, C23F 700

Patent

active

044708530

ABSTRACT:
An aqeuous acidic composition provides improved coating for aluminum. The composition comprises from about 10 to about 150 ppm zirconium, from about 20 to about 250 ppm fluoride, from about 30 to about 125 ppm tannin, from about 15 to about 100 ppm phosphate and from about 5 to about 50 ppm zinc, said coating solution having a tannin to phosphate ratio in the range of at least about 1:1 to about 2:1 and a pH in the range of about 2.3 to about 2.95.

REFERENCES:
patent: 3682713 (1972-08-01), Ries
patent: 3964936 (1976-06-01), Das
patent: 4054466 (1977-10-01), King et al.
patent: 4071334 (1977-04-01), Matsushing
patent: 4111722 (1978-09-01), Reghi et al.
patent: 4273592 (1981-06-01), Kelly
patent: 4277292 (1981-07-01), Tupper
patent: 4313769 (1982-02-01), Frelin et al.
patent: 4391562 (1983-07-01), Das

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