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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Minimum substrate thickness required for aluminum to be anodized

April 17, 2013

Q. Does anyone know if there is minimum material thickness required for anodic coating class 2 or 3.
I have cartridge that needs to be coated on inside. There is a "U"-shaped .063 thick divider inside the cartridge that divides it into two chambers as such that it has air gap on top and bottom of the divider. Manufacturer says that wall is too thin and acid will eat through the wall when they will try to achieve a uniform coating on inside.
Is this a true statement?

Dmitriy Pats
- Orlando, Florida

A. Hi Dmitriy. Aluminum foil can be anodized, so a material thickness of .063 is not inherently non-anodizable. But that doesn't mean your vendor is necessarily wrong that this part cannot be uniformly anodized without special measures being taken. Send us a drawing of the part for posting if you can.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
April 17, 2013

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