Cathodic Protection is a technique used to control the corrosion of a metal surface by making it the cathode of an Electrochemical cell.A simple method of protection connects protected metal to a more easily corroded "sacrifical metal " to act as the anode.The sacrificial metal then corrodes instead if the protected metal.For structures such as long pipelines,where passive galvanic cathodic protection is not adequate an external DC electric power source is used to provide sufficient current.
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