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AssigneeGerhard Collardin GmbH
InventorsReinhard Opitz, Manfred Breuer
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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.
A process for phosphatizing metal surfaces with an acidic phosphatizing solution containing zinc ions, calcium ions, phosphate ions and accelerators consisting essentially of contacting said metal surfaces after degreasing and without activation with an aqueous solution at a temperature of from 30.degree. to 65.degree. C., said aqueous solution containing
An aqueous acidic phosphatizing solution for treating metal surfaces after degreasing and without activation at a temperature of from 30.degree. to 65.degree. C. consisting essentially of
The aqueous solution of claim 10 wherein said weight ratio is from 1:1 to 1:1.5.
Dependencies are inferred from the claim text.