Phosphating solutions and process

Details Phosphating solutions and process Phosphating solutions and process

1983-11-30

1984-12-25

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23F 710

Patent

active

044901852

ABSTRACT:
A process for phosphating metal surfaces, particularly iron, steel and zinc-plated steel, by treating them with aqueous, acidic zinc phosphate baths at only moderately elevated temperatures in the range of from 22.degree. to 38.degree. C. The baths used have 2 to 6 g/l of Zn; 4 to 23 g/l of PO.sub.4.sup.3- ; a free acid content of 0.05 to 0.4 points; and a pH-value of 3.0 to 4.0. The ratio of Zn to PO.sub.4.sup.3- is preferably in the range from 1:2 to 1:11. The baths can advantageously contain nickel-(II)-ions, with a nickel content not exceeding a Zn:Ni ratio of 1:0.5. This process gives iron-containing zinc phosphate layers having an iron content of from 5 to 20% by weight and is particularly useful for pretreatment for subsequent cathodic electro-dip-lacquering.

REFERENCES:
patent: 3104177 (1963-09-01), Corwin
patent: 3338755 (1967-08-01), Jenkins
patent: 3819385 (1974-06-01), Schumichen
patent: 4265677 (1981-05-01), Muller et al.
patent: 4292096 (1981-09-01), Murakami et al.

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