| 摘要 |
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 Co<2+>, the Co<2+> concentration being higher than 30g/l.
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