Passivation method

Details Passivation method Passivation method

C - Chemistry, Metallurgy

23

C

C23C 22/46 (2006.01) C23C 22/53 (2006.01) C23C 22/82 (2006.01)

Patent

CA 2428138

The invention relates to a method for passivating zinc, cadmium, or the alloys thereof, especially zinc-nickel alloys, with a chrome (VI)-free solution containing a weak complexing agent, preferably dicarboxylic or tricarboxylic acids, preferably a chrome (III)-oxalate complex and Co2+, the Co2+ concentration being higher than 30g/l.

L'invention concerne un procédé de passivation de zinc, cadmium ou de leurs alliages, notamment d'alliages zinc-nickel, avec une solution exempte de chrome (VI), contenant un agent complexant faible, de préférence des acides dicarboxyliques ou tricarboxyliques, de préférence un complexe chrome (III)-oxalate et du Co?2+¿, la concentration en Co?2+¿ étant supérieure à 30g/l.

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