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topic 1902

TGIC polyester powder coat on anodized aluminum



1998

In despite of cost considerations, would powder coating (TGIC polyester) on top of anodized aluminum extrusions further improve the corrosion resistance? Will there be any adhesion problem without the chromated conversion coat?

Please enlighten me.

Fred Yeung
Solarbrite Co. Ltd - Hong Kong


1998

Yes, it will improve the corrosion resistance, but recognize that architectural anodized aluminum can last decades outdoors, and it's pretty hard to improve on terrific. To maximize adhesion, the anodized aluminum should not be sealed.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


1998

Powder coating over commercially anodised aluminium is fraught with adhesion problems. Techniques are becoming available for specially developed thin anodised films that can be used as a conversion coating to replace chromate and or phosphate conversion coatings.

Mario Pennisi
- Powder Coater Painter - Brisbane, Queensland, Australia

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