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How to get a matte surface before aluminum anodizing?

My customer provide a aluminum tube sample which is clear anodized, with a matte surface, but not from sanding. It's said to be chemical pre-treated before anodizing. How to get a matte surface with chemical treatment? Thanks a lot.

Michael Qiu
plating shop employee - Qingdao, Shandong, China
March 10, 2010

Hi, Michael. Probably just caustic etching followed by desmutting.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
March 11, 2010

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