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topic 2472

High temp powder coating pretreatment


have experienced problems with complete delamination of powder coating on cold rolled steel after heating to 650 F.

Pretreatment used is 7 stage iron phosphate. Is anyone aware of a better pretreatment for powder coating cold rolled that can withstand elevated temperatures.

Patrick Patton


Dear Patrick, I believe I have a solution to your paint delamination problem. What is happening is the phosphate under the paint is breaking down. You will have to go to a non phosphate treatment. Chemetall Oakite has 2 products that have worked in this type of application. They are UltraSeal and ChemSeal 3620 C. Regards,

Danny Murchison
- Memphis, Tennessee


For applications at 650f powder coating may not be the best choice no matter the pretreatment. You may want to consider a ceramic coating.

Robert Hewitt
- Columbus, Ohio

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