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Learning the HARD way...
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7,700 Posts
I believe that they are 304 stainless... They're probably stuck to the keel with 4200 or 5200. The best bet would be to get a sharp - disposable chisel, and a heatgun. Heat the plates, then put (drive) the chisel under the plate, and pry up.

Replace with 1/8" plates made from 316 stainless.
 

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Learning the HARD way...
Joined
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7,700 Posts
The iron oxide and water is more corrosive than water alone.

Frankly, if the plates are not too far gone, I would first try to clean with a wire wheel and a drill. If you want / need to replace them, I would figure out where all the water came from in the first place.

Also, lightly coat the bolts with Tef-Gel before replacing the nuts (frankly, I would put some on the bolts before trying to back the nuts off).
 
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