C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/17, 204/97.0
C23C 22/12 (2006.01) C23C 22/17 (2006.01) C23C 22/36 (2006.01) C25D 13/20 (2006.01)
Patent
CA 1205726
ABSTRACT OF THE DISCLOSURE A process for phosphating metal surfaces, par- ticularly 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 to 38°C. The baths used have 2 to 6 g/l of Zn; 4 to 23 g/l of PO43-; a free acid content of 0.05 to 0.4 points; and a pH-value of 3.0 to 4Ø The ratio of Zn to PO43- is pre- ferably in the range from 1:2 to 1:11. The baths can advantageously contain nickel-(II)-ions, with a nickel con- tent 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 use- ful for pretreatment for subsequent cathodic electro-dip- lacquering.
442079
Gottwald Karl-Heinz
Opitz Reinhard
Borden Ladner Gervais Llp
Collardin (gerhard) G.m.b.h.
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