Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Powder coating over e-coated surfaces

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
- Enschede, The Netherlands
2002

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, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
April 29, 2009

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