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Cathodic Protection is the most widely applied electrochemical corrosion control technique. This is accomplished by applying a direct current to the structure such as pipelines, storage tanks, pressure vessels  and others which causes the structure potential to change from the natural corrosion potential to a protective potential in the immunity region.

The required cathodic protection current is supplied by sacrificial anode materials or by an impressed current system. Most metals in contact with an aqueous environment having a near neutral pH can be cathodically protected