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Brite Dip Anodize Washes Off; Matte Anodize Doesn't

April 10, 2013

Q. I have a situation where the brite dip red anodize is coming off during a typical wash cycle at a local hospital. Any ideas on what could cause this and a corrective action to prevent this from happening again? We sampled some green and black parts with a non-brite anodize and they did ok through the wash cycle.

Tony Adrian
QC Engineer - Indianapolis, IN USA

A. Hi. Although it's possible that this batch wasn't sealed properly, also look into the anodizing thickness. Anodizing is somewhat translucent but it's not water clear -- and what that means is that the anodizing thicknesses must be rather low to maintain a full bright look. It's possible that your other anodizing might be 0.0005-0.0007 inches thick and your bright dip anodizing only 0.0002 inches.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
April 12, 2013

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