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The principle of cathodic protection is in connecting an external anode to the material to be protected from corrosion and passing of an electrical DC current. So that all area of the metal surface become cathodic and therefore do not corrode. The external anode may be a galvanic ( sacrificial ) anode or it may be an impressed current anode where the current is impressed from external D.C source.Three metals that can be used as sacrificial anodes are zinc, aluminium, and magnesium.

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