C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/17
C23C 22/80 (2006.01)
Patent
CA 1260809
14 Improved method of zinc phosphatization activation and refining bath used in said method and corresponding concentrate A B S T R A C T Method of zinc phosphatization of substrates essentially based on iron, zinc or their alloys, compris- ing successively: 1) one or several alkaline degreasing steps, 2) one or several rinsing steps with running city water, 3) an activating and refining step, 4) the zinc phosphatization step proper, 5) one or several rinsing steps with water, 6) preferably, a passivating final rinsing step, particu- larly by means of salts of hexavalent chromium or mix- tures of hexavalent chromium and trivalent chromium characterized by the fact that, to carry out the activat- ing and refining step, recourse is had to a bath compris- ing, besides the conventional constituents among which are particularly at least one Jernstedt salt in a proportion corresponding to about 1 to 100 ppm of titanium, a propor- tion of 10 to 700 ppm, preferably from 50 to 200 ppm, of at least one alkane-phosphonic acid of formula Image (I) or at least one of the alkali or ammonium salts corres- ponding to the abovesaid alkane-phosphonic acids, the pH of the bath being from 7 to 9.5, preferably from 7.5 to 9.
494250
Jelodin Stephane
Ken Victor
Schapira Joseph
Thery Denis
Cfpi Industries
Goudreau Gage Dubuc
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