A source of electric current for protection against corrosion of pipelines, tanks, and other metal installations buried or in contract with the earth. Using a source of ac electric current, the rectifier installation converts the ac to dc (direct current) and allows the dc to flow into the metal to be protected. By reversing the flow of electric current, the corrosion is in. Hibited. Metal corrosion is a chemical action which produces minute quantities of current that normally flows away from the metal into the ground.
