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Green corrosion could simply be oxidation and not galvanic corrosion. I don't have a scientific position on bonding thru hulls to prevent galvanic corrosion and have seen both. I have not seen clear evidence of either position.

Intuitively, one requires an anode and cathode in an electrolyte to have galvanic corrosion. When a thru hull is exposed to this problem, one would think it needs protection. When not, one would think it doesn't. Still, metals can simply oxidize.
 
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