Letter 22010

Aluminum cathodes for anodizing  

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What is the best alloy of aluminum to use for cathode in an anodizing tank(sulfuric acid).

Vick Corso
fabtricators - Slidell, LA, U.S.

6063 T6. For more info see letter 1177.

Ted Mooney, P.E.  finishing.com Brick, New Jersey

The alloy of choice is 6063t6. It is the most durable Aluminum alloy for sulfuric acid anodizing baths,both type II and III hard coat. We have system using this alloy in the field for over 2 1/2 years with minimal material loss even without cathode protection. Although there is some difference of opinion on the matter we prefer the flexibility of bolted connections. Attend the talk at Sur/Fin on equipment updates in anodizing in Milwaukee in June.

Drew Nosti CEF
Member AESF Light Metal Committee
Member AAC Hard Coat Committee

Drew Nosti, CEF Ladson, SC

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