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Pretreatment for painting of aluminum flat sheet

January 10, 2010

We are production company producing print finishing equipment.
Recently we decided to change steel frame to aluminum sheet 3/8 x 6. At the present time we have a problem with paining. We know that aluminum should be anodized before painting,but is there any way to paint aluminum without pretreatment ?
Thank you .
ERSO

Aleksandr Alayev
production - Toronto, On, Canada

January 11, 2010

Hi, Aleksandr. It is not true that the aluminum should be anodized. Rather, it should be chromate conversion coated. Next best would be phosphatization in a phosphate system designed for mixed metal. It is possible that you can get adequate adhesion with a self-etching primer without doing the conversion coating, adequate for a do-it-yourselfer, but it isn't really the right approach for equipment that will be sold. Good luck.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
(Ted is available for instant or longterm help)
finishing.com - Pine Beach, New Jersey

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