Electrolysis / Keel stepped mast
My wife & I recently purchased a beautiful 1985 34 ft. Seidelmann Sloop. We have named her "MATCHMAKER", but that''s a story for another time. When we un-stepped the mast for transport (keel stepped), We noticed that the keel end of the mast has significant pitting that looks to me like electrolysis. The paint at the mast foot has also deteriorated. The marina foreman says the mast is still OK but looks like it hasn''t been removed for years. The mast step is an aluminum plug and is wet with only an inch or two of accumulation.
Is there a way to stop this action for good, before I have to trim or otherwise repair the mast? I plan to re-paint the mast end. Will adding an electrical ground to the mast and step leading back to the engine help? How about "Never-Seize" on the step?
Any help would be appreciated.