C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/17
C23C 22/22 (2006.01) C23C 22/12 (2006.01) C23C 22/13 (2006.01) C23C 22/14 (2006.01) C23C 22/16 (2006.01) C23C 22/17 (2006.01) C23C 22/36 (2006.01)
Patent
CA 1245951
ABSTRACT OF THE INVENTION A PROCESS FOR THE ZINC/CALCIUM PHOSPHATIZING OF METAL SURFACES AT LOW TREATMENT TEMPERATURES The invention relates to a process for phosphatiz- ing metal surfaces with an acidic phosphatizing solu- tion 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° to 65°C with solutions which contain Zn2+, Ca2+, PO43- and, as accelerators, nitrate and/or nitrite and/or chlorate ions and/or an organic nitro compound and/or H2O2 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+ + Zn2+) to PO43- 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.
474932
Breuer Manfred
Opitz Reinhard
Gerhard Collardin G.m.b.h.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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