Coating Terms

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A metal object, desired to be protected from corrosion, is made the cathode of an electrolytic circuit and therefore, corrosion rate is decreased dramatically. This method is called cathodic protection. Cathodic protection can be obtained by constructing a circuit with the metal to be protected and an inert electrode; and using the metal as the cathode by applying a voltage. Another method is to connect the metal object with a more active metal (called sacrificial anode) to form an electrochemical cell.