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Does Baking of Trivalent Passivates Produce Hexavalent Chromium?

We have done some work on baking trivalent passivates. (Many of you may have read our work on trivalent passivates, heard it at Sur/Fin 2009, or at least heard of it.) We tested five trivalent passivates. After passivating, we subjected them to one hour at 400 °F. We tested each surface for hexavalent chromium by the ISO 3613 Test Method 5.5 using ISO 3613 Test Solution C (diphenylcarbazide). Four of the five samples tested positive for hexavalent chromium. (We also tested a 'blank' - a sample with no passivate, which tested negative.) Are these results consistent with the results others have obtained or are they an anomaly?

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

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June 23, 2009

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