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Cathodic protection (CP; / kæˈθɒdɪk / ⓘ) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. [1] . A simple method of protection connects the metal to be protected to a more easily corroded "sacrificial metal" to act as the anode.
Cathodic protection (CP) is an electro-chemical process that slows or stops corrosion currents by applying DC current to a metal. When applied properly, CP stops the corrosion reaction from occurring to protect the integrity of metallic structures.
Cathodic protection is a popular protection method for preventing corrosion in pipelines, offshore oil platforms and other steel structures. However, to be implemented effectively, it is crucial to understand the basic principles of bimetallic/galvanic corrosion.
Cathodic Protection is an industrial technique for controlling metallic corrosion. Cathodic protection is commonly used on buried and submerged metallic structures like pipelines, underground storage tanks, locks, subsea equipment, offshore floaters, harbors, and ship hulls.
Cathodic protection systems are designed to control the corrosion of a metal surface. While localized damaged surfaces can be patched, ongoing degradation may weaken the integrity of the overall infrastructure.
Cathodic protection methods – differences and similarities. In our last article, we examined electrochemical corrosion and introduced the major areas where cathodic protection is used to protect against corrosion in aggressive environments such as soils, waters, and chloride contaminated concrete.
Cathodic protection is one of the most effective methods for preventing corrosion on a metal surface. Cathodic protection is commonly used to protect numerous structures against corrosion, such as ships, offshore floaters, subsea equipment, harbours, pipelines, tanks; basically all submerged or buried metal structures.
Cathodic protection (CP) is a corrosion-control technology that involves making a metal surface the cathodic side of an electrochemical cell. Connecting the metal to be protected with a more readily corroded metal to act as the anode of the electrochemical cell is the easiest way to apply CP.
Corrosion control systems which relocate these oxidation reactions, by making the protected structure a cathode in a larger corrosion cell, is called a “cathodic” protection system.” The cathodic protection anodes are installed to become the anode in this larger corrosion cell and provide the location for all oxidation reactions in the cell.
The principle of Cathodic Protection (CP) is to lower the corrosion potential of a metal object. This can be done with a protective current or by using sacrificial anodes. In both cases, the metal to be protected is made cathodic and thus impervious to corrosion.