WB8NBS blogs about removing rust on items via electrolysis:
I watch for garage and estate sales with old tools I can use. My garage is full of restored tools, most tuned to be as good or better than when they were new. “They don’t make them like they used to” is certainly true for woodworking hand tools.
This is my current favorite hand plane. Found at a flea market, all exposed surfaces had a good coat of rust and to further insult, someone had varnished over the rust. It now works beautifully.
Electrolysis won’t damage underlying iron but doesn’t actually remove the rust. It just changes the red oxide to a black form that is easily scrubbed off, so there’s still elbow work involved. Electrolysis in itself won’t remove paint or plating.
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