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Ted Mooney, P.E. RET
Pine Beach, NJ

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Alodine, anodize or alochrome--which to prevent aluminum corrosion

Q. I would like to get a general description and the differences between conductive and/or non-conductive processes such as Alodine, anodize & alochrome. I want to implement this in my aluminum enclosure that will be used for both electromagnetic shielding & environmental sealing.

Silulami Doyi
signal processing for mining systems - Cape Town, Western Cape, South Africa
2004

A. Alodine and Alochrom are the same thing, trade names of Henkel for chromate conversion processes. Such treatments are conductive and corrosion resistant, and do not involve electrolytic processes. Anodizing is an electrolytic process that deposits aluminum oxide on the parts. It is more durable and more corrosion resistant (usually) than chromate conversion coatings, but is more expensive and non-conductive.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2004

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