Cathodic protection
Türkçe: Katodik koruma
A method that protects buried metal pipes and tanks from corrosion by turning the metal into the cathode of an electrochemical cell.
// EXPLANATION
Corrosion starts where metal behaves as an anode in the soil and loses electrons. In cathodic protection either a more active metal (magnesium, zinc) is sacrificed (galvanic anode) or current is impressed from a rectifier (impressed-current system). The protected pipe becomes the cathode and corrosion stops. Drinking-water transmission lines and gas pipelines are typical uses.
// ALSO KNOWN AS
cathodic protectioncathodic
// RELATED TERMS
Earthing (grounding)An arrangement that connects the conductive parts of an installation to the ground through a low-resistance path so fault current has a safe way out.
Earth resistanceThe resistance an electrode presents to the surrounding soil; the lower it is, the more easily fault current flows into the ground.
