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Old 04-02-2017, 06:08 PM   #2
kchace
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City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,260
It's hard to tell from a picture, but it does look like aluminum corrosion. with stainless screwed to the aluminum and salt water contact, the aluminum will always lose. This is galvanic corrosion and grounding will make no difference. The only thing you could possibly do and I don't know how you'd do it in a practical sense - is electrically isolate the stainless from the aluminum.

Ken
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