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Unlike impressed current cathodic protection (ICCP) systems, steel constant polarization is not the goal, rather the restoration of the environment. Polarization of the target structure is caused by the electron flow from the anode to the cathode, so the two metals must have a good electrically conductive contact.
Impressed Current Cathodic Protection, a system used to control the corrosion using anodes connected to a DC power source Institute for Certification of Computing Professionals , a non-profit organization that develops and administers certifications for the information technology industry
Cathodic protection is the application of voltage to the steel (through the use of a galvanic anode or a impressed current CP system) to make the entire surface of the steel have a uniform voltage-potential. When the surface of the steel is uniform, the driving force for the corrosion reaction is now missing and corrosion does not occur.
A galvanic anode, or sacrificial anode, is the main component of a galvanic cathodic protection system used to protect buried or submerged metal structures from corrosion. They are made from a metal alloy with a more "active" voltage (more negative reduction potential / more positive oxidation potential ) than the metal of the structure.
Another cathodic protection is used on the impressed current anode. [11] It is made from titanium and covered with mixed metal oxide. Unlike the sacrificial anode rod, the impressed current anode does not sacrifice its structure. This technology uses an external current provided by a DC source to create the cathodic protection. [12]
For larger structures, galvanic anodes cannot economically deliver enough current to provide complete protection. Impressed current cathodic protection (ICCP) systems use anodes connected to a DC power source (such as a cathodic protection rectifier). Anodes for ICCP systems are tubular and solid rod shapes of various specialized materials.
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Impressed current cathodic protection (ICCP) is used to protect wind turbine monopiles and floating wind turbine platforms. ICCP systems are increasingly popular as a solution against corrosion, as they do not require on-site monitoring, and are more eco-friendly and cost-effective than traditional galvanic systems.