Phosphating process of metal surface

Details Phosphating process of metal surface Phosphating process of metal surface

1981-04-06

1983-12-06

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23F 708

Patent

active

044191472

ABSTRACT:
A process for phosphating a metal surface to be electrocoated, which comprises treating the metal surface with an acidic phosphating solution comprising a zinc compound in a concentration of 0.5 to 1.5 g/l as zinc ion, a phosphate in a concentration of 5 to 30 g/l as phosphate ion and a nitrite in a concentration of 0.01 to 0.2 g/l as nitrite ion and/or an aromatic nitro compound in a concentration of 0.05 to 2 g/l in water at a temperature of 40 to 70.degree. C. first by dipping for not less than 15 seconds and then by spraying for not less than 2 seconds.

REFERENCES:
patent: 3676224 (1972-07-01), Snee
patent: 4053328 (1977-10-01), Oka et al.

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