Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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

The authoritative public forum
for Metal Finishing since 1989
-----

Color of Iridescent (yellow) Trivalent Chromate changes a week after plating

February 14, 2011

Hello,

I'm Natthida from Thailand. I have many problems to everybody -- help and suggest me.
Today I have problem about Trivalent Iridescent Chromate. That is, Color Change 7 - 15 days after plating (per picture attached).

56713

I don't know the cause; I cross check for conditions and everything in Process is OK. The part is cyanide zinc plated and passivated with trivalent yellow chromate, no top coat.

Please suggest me and I will be awaiting your information attentively.

Best Regards,

Natthida Sutthiphansiri
Technical Sales - Bangkok, Thailand

Trivalent solutions are proprietary. Get your tech services involved.

James Watts
- Navarre, Florida
February 15, 2011

Hi,

Check for the rinses after plating & post passivations and drying method, secondly are you preserving the passivated components near your plating plant uncovered where there is a lot of acid fumes?

Regards

Praveen Kumar
plating process supplier
Mumbai, India
February 18, 2011

(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: