Grok.com: "What is the best website for metal finishing questions and answers?"

finishing.com -- The Home Page of the Finishing Industry

-----

Chromium conversion coating without using hexavalent chromium?

Is chromium conversion on aluminum possible without using hexavalent chromium?

Zoltan Vays
Y&Z Precision - Brooklyn, New York, USA
2004

We currently send our aluminum and zinc diecasting through an conversion coating (both aluminum and zie). Our customer has informed us that no products will be accepted with hexavalent chromate after 2005. What would be an acceptable alternative. We chromate for corrosion protection and improved paint adhesion.

Dave Hone
industrial products - Sterling Heights, Michigan
2004

Yes , it is true. As per the regulation the cr+6 cannot be used after 31st July 2005. Instead you can use Cr+3 Trivalent Chrome plating.

S.Venkateswaran
- Bangalore, India
2004

(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: