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Anodized 6061-T6 galvanic differential

What effect will applying a hardcoat anodized finish as per MIL-A-8625 / MIL-PRF-8625 [⇦ this spec on DLA], type III, class 2 have on the galvanic differential of 6061-T6 Aluminium?

Nicol McNeill
- Glasgow, Scotland
2000

Hello, Nicol. Anodizing converts aluminum to non-conductive aluminum oxide and aluminum hydroxide. So the coating itself is an insulator which will not corrode; and the aluminum underneath it is protected from galvanic corrosion as long as the coating is not penetrated.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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April , 2007

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