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When a metal rod is dipped in an electrolyte, the portion of the metal rod dipped in , is poor in oxygen concentration and works as an anode.and the portion works as anode. The portion above water will work as cathode which is protected. This system acts as a Concentration cell.This is a type of electrochemical corrosion.

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Aeration corrosion is a type of corrosin that occur when oxygen concentration vary across a metal surface . Thevary concentration of oxygen creats an anode and a cathode on metals suurface . oxidation occurs because an anode and a cathode have been established on the surface. 

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