The basic concept of cathodic protection is that the electrical potential of the subject metal is reduced below its corrosion potential, and that it will then be incapable of going into solution, or corroding.
Indeed the principles of corrosion reactions are used in the design and construction of expendable and re-chargeable batteries and accumulators which play such a major part in modern life. Likewise a car battery on charge does not corrode, in fact in this case the reaction is reversible, and energy is ‘pumped back in’.
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