cathodic protection


Cars & Driving

  • noun the process of protecting a metal from electrochemical corrosion by using it as the cathode of a cell with a sacrificial anode


  • A form of protection against electrolytic corrosion of fuel tanks and water pipes submerged in water or embedded in earth. Protection is obtained by providing a sacrificial anode that will corrode in lieu of the structural component, or by introducing a counteracting current into the water or soil. This type of protection is also used for aluminum swimming pools, cast iron water mains, and metal storage tanks.


  • The reduction or prevention of corrosion of a metallic material by making it the cathode in a conductive medium that has a sacrificial anode. This conductive medium may occur naturally, or can be applied externally. Used, for instance, in certain pipelines, bridges, and other metal structures requiring corrosion protection over an extended period of time. Also called electrolytic protection.