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Cathodic Protection buy in Port Harcourt
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Cathodic Protection

Cathodic Protection

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Nigeria, Port Harcourt
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What CP does is not actually to eliminate corrosion. Instead, it reduces the corrosion rate to an acceptable level by transferring it from the structure to be protected to the cathodic protection anode(s), thus making the structure the cathode of an intentional corrosion cell.

For any corroding structure, there are numerous local and microscopic corrosion cells on the surface of the metal. The potential difference between the anode and cathodes of these cells drives the corrosion current. The concept of CP involves reducing the potential difference to zero, resulting in zero corrosion current. CP is accomplished by galvanic (sacrificial) anode systems and impressed current systems.

In impressed current systems, a direct current is forced to flow onto the structure from an external anode which current polarizes the cathode sites in an electronegative direction. By properly adjusting the amount of current flowing, the potentials of the cathodic sites polarize toward the potentials of the anodic site, and corrosion current is reduced.

When the driving voltage of the CP system reach the open circuit potential of the most active anodic sites, the voltage difference between the local anodes and cathodes is eliminated and corrosion ceases.

Cathodic protection is a polarization phenomenon. Polarization of the cathodic sites to the open circuit potential of the anodic sites is the criterion for eliminating corrosion, but to determine the open circuit of the most active anodic site is however impossible. Several criteria have been developed and recommended by National Association of Corrosion Engineers (NACE) International Standard Organization and (ISO) to assist meeting the true criterion for polarization. The polarized potential of a structure is measured to determine the level of protection, and this is the potential across the structure-to-electrolyte interface. This is essentially the potential of interest; - the result is the algebraic sum of all the voltage drops (IR) in the measuring circuit. Our engineers are current with the various levels of NACE cathodic protection (CP) certifications.
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Cathodic Protection
Cathodic Protection
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