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Originally Posted by MC
Aluminum oxide does NOT conduct electricity thereby removing all posibilities of galvanic reaction.
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Since the aluminum oxide does not conduct electricity, how do you get your anodization more than a molecule thick? In a similar vein, how do you think your pigments get into and stay in your anodization layer?
Just as you can run more current through to increase your depth of anodization, galvanic currents can flow. No matter how non-conductive your aluminum oxide is, andozing produces a porous layer of it.
In exacty the same way that you get more oxygen to the raw metal to anodize deeper, in exactly the same way that your dye penetrates the surface, ions can and will cross anodization to cause corrosion. That layer of porous aluminum oxide will only slow, not stop, corrosion.
Either use anti-corrosives or don't mix your metals.