C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/17
C23C 22/07 (2006.01) C23C 22/36 (2006.01)
Patent
CA 1199559
ABSTRACT OF THE DISCLOSURE In a process for the application of conversion coatings to aluminum surfaces, solutions are used which contain titanium and/or zirconium, fluoride and phosphate ions, but which are free from nitrate, nitrite, and chromium ions and also from organic film-forming polymers and tannin. In order to avoid wastewater treatment problems and also difficulties in a succession of treatments, the aluminum surfaces are brought into contact with a solution which has a pH value of at most 3.5 and which contains at least 1 g/l of zirconium ions and/or at least 0.5 g/l of titanium ions and also at least 1.5 g/l of phosphate ions. The molar ratio of phosphate ions to zirconium and/or titanium ions is to be at least 0.5, and that of fluoride ions to zirconium and/or titanium ions at least 5, in the solution. The composition of the film of solution applied is to be selected such that a film weight of 10 - 300, preferably 20 - 200, mg/m2 results on subsequent drying out. Molar ratios of phosphate ions to zirconium and/or titanium ions of at most 5, and of fluoride ions to zirconium and/or titanium ions of at most 15, are preferred.
437827
Schiefer Peter
Wittel Klaus
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Parker Chemical Company
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