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Re: Fridge Compressor Corrosion - Stray Current?
To stabilize the casing, you'd want to sand, wire bursh, or etch it down to clean metal and then paint it up with several coats of "zinc" paint. Then you'd need to find out whether the problem is in the casing or if it is being chewed up by galvanic action.
You'll find some comprehensive articles online about testing for galvanic action, and methods to either isolate (probably not possible for you) or to add zincs outside and take other action to stop the damage. I'd suggest checking the rest of the boat, if there's galvanic damage to one item, there may be more damage to others.