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Exposing chromate coatings to high temperatures

I have been told no to expose chromate conversion coatings to elevated temperatures as the plating would break down when exposed to temperatures above 60��°. For applications where we need to plate (for conductivity) and then mask + paint.... powder coat paints typically require oven cure @ 200��° (390��) for ~ 10 minutes.

Would this temperature exposure and dwell time be detrimental to the 289 yellow chromate coatings?
Would this temperature exposure and dwell time be detrimental to the 1918 clear chromate coatings - in particular the current trivalent chromate coatings ?

Or, would this exposure not cause unacceptable deterioration of the plating because of the relatively short dwell time?

Eileen Goulet
reliabilty lab tech - Ottawa Canada
September 20, 2010

Do not heat the bare coating over 140F, and in the case of under paint, keep the chromate coating very thin, just barely iridescent, especially under powder coat.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

September 27, 2010

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