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topic 17309

Powder coating over e-coated surfaces


2002

Any suggestions/advice for powder coating over a new steel frame after it has been e-coated? I have a 5 stage wash, alkaline - rinse - phosphoric - rinse - RO rinse, and my chemical rep is advising running only the 4th and 5th stage.

David Simon
- Cascade, Iowa


2002

Presuming you get those parts supplied e-coated by others, I would go for 1-2-5, thus removing dirt, finger stains, oil/grease etc. Test one part first; not all E-coat - powder combinations supply enough adhesion. Also outgassing problems are known, especially when the e-coat was cured at too low temp's.

Good luck,

Remmelt Bosklopper
Remmelt Bosklopper
- Enschede, The Netherlands


April 29, 2009

Hi, David. Obviously, the ideal situation would be to go directly from e-coating to powder coating. But I believe that Remmelt is correct that you are likely to have fingerprints and other soils which much be removed before powder coating. Good luck.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com
Pine Beach, New Jersey
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