C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/17
C23C 22/12 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01)
Patent
CA 1334371
In a process of applying phosphate coatings to surfaces consisting of aluminum and/or zinc and/or its or their alloys by means of phosphating solutions used in low- zinc technology, the number of points of free acid is maintained constant in that the surface is contacted with a phosphating solution which contains iron-III-ions in a concentration of at least 1 mg/l and to which 50 to 2000 mg iron-III-ions, preferably up to 1000 mg iron-III-ions, are added per square meter of treated surface area. The phosphating solution suitably contains 0.4 to 1,5 g/l zinc; 10 to 26 g/l P2O5 and 0 to 1.3 g/l Ni; 0 to 1.3 g/l Mn; 0 to 1.3 g/l Mg and the weight ratio of Zn to P2O5 is in the range from (0,075 to 0.015) : 1 and - if applicable - the weight ratio of Ni, Mn and/or Mg to Zn is up to 1.5 : 1. The phosphating solution may additionally contain as an accelerator 2 to 25 g/l NO3; 1 to 6 g/l ClO3; 0.1 to 2 g/l organic nitro compound; 0.05 to 0.5 g/l NO2; 0.02 to 0.1 g/l peroxide (calculated as H2O2) or mixtures thereof. It is used at a temperature in the range from 30 to 70°C.
607371
Gehmecker Horst
Hauffe Dieter
Muller Gerhard
Rausch Werner
Metallgesellschaft Aktiengesellschaft
Robic
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