I took my boat out of storage and noticed the base of my boat seats are all corroded with a crystalized type of substance. I cleaned this up in the fall and now its back WHY?
Seat base corrosion
This is a question for an electrician
Or electrical engineer on this corrosion problem
Since the boat is isolated from ground
Would it not make sense to add a ground connection
And plug the boat in to ground when you're not using it
STRAY CURRENT CORROSION is simply corrosion caused by stray (leaking) current from a bilge
pump or a battery charger among other things.
There are many more types of corrosion however, the two main issues on boats involving electricity are either GALVANIC CORROSION or ELECTROLTYIC COROSION (commonly referred to as "stray current corrosion".
Electrolysis. It is common and more than likely will come back. Not a huge issue unless it is excessive.... too lengthy to try and explain why it happens. For the most part clean it up and don’t worry too much