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97566 POLARIZATION BENEATH DISBONDED COATINGS: A COMPARISON BETWEEN CONVENTIONAL AND PULSED CATHODIC PROTECTION

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Product Number: 51300-97566-SG
ISBN: 97566 1997 CP
Author: D.A. Diakow, G.J. Van Boven, M. J. Wilmott
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Disbonded, shielding coatings over pipeline steel can oflen lead to serious corrosion problems that cannot be readily controlled by conventional cathodic protection systems. Cathodic protection effectiveness in these cases is limited by the high resistance electrical path in the crevice formed between the steel surface end disbonded coating. This study investigates the hypothesis that application of pulsed cathodic protection may improve the penetration of protective cathodic protection beneath disbandments to provide more effective corrosion control. Polarization experiments beneath a simulated disbandment were conducted using conventional and pulsed cathodic protection. Current demand, potential protiles, polarization, pH differences and effectiveness of each system were calculated. Results indicate that certain pulsed waveforms increase the distance in a crevice at which protective potentials can be achieved. Keywords: cathodic protection, pulse, potential, current, polarization, disbonded, coatings, corrosion, pipeline
Disbonded, shielding coatings over pipeline steel can oflen lead to serious corrosion problems that cannot be readily controlled by conventional cathodic protection systems. Cathodic protection effectiveness in these cases is limited by the high resistance electrical path in the crevice formed between the steel surface end disbonded coating. This study investigates the hypothesis that application of pulsed cathodic protection may improve the penetration of protective cathodic protection beneath disbandments to provide more effective corrosion control. Polarization experiments beneath a simulated disbandment were conducted using conventional and pulsed cathodic protection. Current demand, potential protiles, polarization, pH differences and effectiveness of each system were calculated. Results indicate that certain pulsed waveforms increase the distance in a crevice at which protective potentials can be achieved. Keywords: cathodic protection, pulse, potential, current, polarization, disbonded, coatings, corrosion, pipeline
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An experimental setup was designed to investigate the cathodic protection (CP) penetration into coating disbondment. Embedded detection probes underneath the disbondment enabled pH and steel potential measurements without disturbing the environment inside the disbondment.
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The transport of dissolved O2, and that of dissolved carbon dioxide (CO2) if present, into the disbonded region through holiday can be key to determining the disbonded corrosion rate. The evolution of chemistry in the disbonded region and the transient behavior of corrosion potential and rate in the disbonded region are investigated and reported in this work.
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