the cathodic protection (galvanic protection)
Cathodic protection (CP) is a kind of electrochemical protection technology. The cathode protection (galvanic protection) is used to exert an impressed current on the metal surface,make it work as a cathode of an electrochemical cell, thus control the electronic migration of metal corrosion, and avoid or weaken the corrosion.
Cathodic protection (cathode protection) system is used to protect a wide range of metallic structures in various environments. Currently, cathodic protection (galvanic protection) technology is widely used in soil, steel water or fuel pipelines and storage tanks such as home water heaters, steel pier piles, ship and boat hulls, offshore oil platforms, onshore oil well casings and metal reinforcement bars in concrete buildings and structures. Besides, galvanic protection can be applied to galvanized steels, in which a sacrificial coating of zinc on steel parts protects them from rust.