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Ted Mooney, P.E. RET
- Pine Beach, NJ

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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

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