Aloha, fun & authoritative answers -- no cost, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Metal finishing Q&As since 1989

-----

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.

plating systems & technologies banner ad

June 23, 2009

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: