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Hexavalent Chromium in Trivalent Passivating Baths?

My name is Tom Rochester and I have written articles on trivalent passivates. Has anyone ever heard of hexavalent chromium being detected in trivalent passivating baths? (I never have.) I am not referring to hexavalent chromium on the parts or the films produced, but actually in the baths themselves. If anyone has heard of this happening, I would appreciate hearing some of the details. Thanks!

Tom Rochester
CTO - Jackson, Michigan, USA
Plating Systems & Technologies, Inc.

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October 13, 2011

December 18, 2011

I met this problem before
because of HNO3, sometimes goes from Cr +3 to Cr +6
this is true
but limit is important up to 3 ppm I remember

Dr Halim Polat
- Istanbul

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