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On the method of electrolysis, the discussion link has already been uploaded in this forum
On the zinc soda method, the dissolution of caustic soda attacks zinc, forming zinc hydroxide and releasing hydrogen. The hydrogen, in the nascent state, attacks the metal oxide, and the oxygen starts, the dust remains of the original material.
Both have the advantage that they remove the oxide from the "caries" or caverns, which otherwise would have to be eliminated by the treatment of the surface, thus eliminating material.
Any acidic method that is used, such as acetic, while decomposing the oxide, simultaneously attack the non-oxidized metal, or the metallic base, once it has acted on the oxide.
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