Cathodic protection (CP) is a technique to control the corrosion of a metal surface by making it work as a cathode of an electrochemical cell.
How done[]
This is achieved by placing in contact with the metal to be protected another more easily cororded metal to act as the anode of the electrochemical cell.
Uses[]
Cathodic protection systems are most commonly used to protect steel, water/fuel pipelines and storage tanks; steel pier piles, ships, offshore oil platforms and onshore oil well casings.
In elctrical generating stations using condensers in steam turbine exhaust, a similar system is used to protect tube ends in water boxes.
Other uses[]
Cathodic protection can be, in some cases, an effective method of preventing stress corrosion cracking.
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