Formation of zinc phosphate coating on metallic surface

Details Formation of zinc phosphate coating on metallic surface Formation of zinc phosphate coating on metallic surface

1980-05-01

1982-07-06

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

C23F 708

Patent

active

043381413

ABSTRACT:
An acidic aqueous zinc-containing coating solution containing about 0.4 to about 1 g/l of zinc, about 5 to about 40 g/l of phosphate, about 2 to about 5 g/l of chlorate, and about 0.01 to about 0.2 g/l of nitrite, and useful for forming on metal surfaces zinc phosphate coatings that exhibit excellent adhesion to a paint film and excellent corrosion resistance after painting when used as an undercoat for the cationic electrodeposition of a paint film, and a process for applying coating composition, including continuous spray or intermittent spray.

REFERENCES:
patent: 3333988 (1967-08-01), Douty et al.
patent: 3676224 (1972-07-01), Snee
patent: 3850700 (1974-11-01), Heller

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