Instructables user ToolNut explains how you can remove heavy rust from any ferrous object with electricity!
Link | The chemistry behind electrolytic rust removal - via proprioception |
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Not sure how to do the outside, but the inside of the tub could be done easily by filling it with the electrolyte (usually alkaline) and suspending the anode in the middle connect the negative to the tub itself.
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I wonder how I could do this to a 500 lb cast-iron bathtub...
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