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Anodic protection
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Anodic protection : ウィキペディア英語版
Anodic protection

Anodic protection (AP) is a technique to control the corrosion of a metal surface by making it the anode of an electrochemical cell and controlling the electrode potential in a zone where the metal is passive.
AP is used to protect metals that exhibit passivation in environments whereby the current density in the freely corroding state is significantly higher than the current density in the passive state over a wide range of potentials.〔Néstor Pérez " Electrochemistry and corrosion science", Kluwer Academic Publishers, 2004 ((google books). )〕〔Anodic protection : theory and practice in the prevention of corrosion, by Olen L. Riggs, Jr. and Carl E. Locke, Plenum Press, New York, 1981〕
Anodic protection is used for carbon steel storage tanks containing extreme pH environments including concentrated sulfuric acid and 50 percent caustic soda where cathodic protection is not suitable due to very high current requirements.
An anodic protection system includes an external power supply connected to auxiliary cathodes and controlled by a feedback signal from one or more reference electrodes.〔( CORRWIKI ), retrieved 8 September 2010〕 Careful design and control is required when using anodic protection for several reasons, including excessive current when passivation is lost or unstable, leading to possible accelerated corrosion.
==See also==

*Cathodic protection
*Sacrificial metal
*Wetting voltage

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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