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TGIC polyester powder coat on anodized aluminum


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


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


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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