Process of producing phosphate coatings on metal surfaces

Details Process of producing phosphate coatings on metal surfaces Process of producing phosphate coatings on metal surfaces

1987-09-04

1989-07-18

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

427 12, 148261, 148262, 148263, C23C 2212

Patent

active

048490318

ABSTRACT:
Disclosed is a process of producing phosphate coatings on surfaces which consist of aluminum or its alloys and of at least one of the materials steel and galcanized steel by spraying or by spraying and dipping. Uniform phosphate layers having a high cover factor are obtained by the use of a phosphating solution which contains about 0.4 to about 0.8 g/l Zn, about 10 to about 20 g/l P.sub.2 O.sub.5, at least one accelerator and about 80 to about 220 mg/l fluoride ("F(el)"), as determined by a fluoride-sensitive electrode immersed into the bath solution and in which the content of free acid (FA) (in points) has been adjusted to and is maintained at a value corresponding to FA=(0.5 to 1.0)+K wherein K is calculated as K=(0.002 to 0.012).times.F(el). The free acid (FA) content is preferably adjusted to and maintained at FA=(0.04 to 0.06).times.C.sub.P.sbsb.2.sub.O.sbsb.5 +K and the content of free acid (FA) is determined using K=(0.003 to 0.009).times.F(el). The process is particularly suitable for preparing the surfaces for being painted, preferably by electrophoretic dip painting.

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patent: 3660172 (1972-05-01), Otto
patent: 3681207 (1972-08-01), Russell et al.
patent: 4419199 (1983-12-01), Hauffe
patent: 4595424 (1986-06-01), Hacias
patent: 4673444 (1987-06-01), Saito
Galvanotechnik, Band 67, Nr. 1, 15, Jan. 1976; Saulgau, DE; and DD-B-113 027 (G. Krebs) 9/29/82.

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