Process for the zinc/calcium phosphatizing of metal surfaces at

Details Process for the zinc/calcium phosphatizing of metal surfaces at Process for the zinc/calcium phosphatizing of metal surfaces at

1985-02-20

1986-11-11

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23C 2212

Patent

active

046220780

ABSTRACT:
The invention relates to a process for phosphatizing metal surfaces with an acidic phosphatizing solution containing zinc ions, calcium ions, phosphate ions and accelerators and, optionally, other additives, characterized in that, after degreasing and without activation, the metal surfaces are brought into contact at 30.degree. to 65.degree. C. with solutions which contain Zn.sup.2+, Ca.sup.2+, PO.sub.4.sup.3- and, as accelerators, nitrate and/or nitrite and/or chlorate ions and/or an organic nitro compound and/or H.sub.2 O.sub.2 or an inorganic peroxide and which have a pH-value of from 2.2 to 3.8, a ratio of free acid to toal acid of from 1:10 to 1:60 and a ratio by weight of (Ca.sup.2+ +Zn.sup.2+) to PO.sub.4.sup.3- of from 1:>8 to 1:40, and to the use of this process for pretreating the metal surfaces for painting by electrodeposition, particularly by cathodic electrodeposition.

REFERENCES:
patent: 4419199 (1983-12-01), Hauffe et al.
patent: 4498935 (1985-02-01), Kent et al.
A. Neuhaus & M. Gebhart, Werkstoffe und Korrosion, 567 (1966).

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