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Clear chromate conversion over powder coat

Q. We have a customer asking for an aluminum part to be powder coated with an area masked that is then to have etch and clear chromate after. Is this possible? Curious if the powder coat will be affected?

Paul Stepanek
- Clackamas, Oregon
May 30, 2024


A. Hi Paul. I am familiar with a facility which made logo nameplates of powder coating and chrome plating by doing the powder coating first and using it at the maskant for a full copper-nickel-chrome plating process. So it is certainly possible to apply powder coating which will survive etch and chromate conversion coating.

However, I suggest that you carefully review this with the customer to avoid possible miscommunication because it sounds far more reasonable to etch and chromate conversion coat the whole item, then mask the area where powder coating isn't wanted. "Etch and chromate" sounds like an excellent pretreatment before powder coating :-)

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey




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