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51318-11271- AC Corrosion Control: When Too Much Cathodic Protection Might Just be a Bad Thing!

Picture for 51318-11271- AC Corrosion Control: When Too Much Cathodic Protection Might Just be a Bad Thing!
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Case histories where throttling down the cathodic protection was evaluated to determine the impact on reducing the AC corrosion threat. Includes the use of fast-response electrical resistance corrosion rate probe monitoring technology.

Product Number: 51318-11271-SG
Author: Dale Lindemuth / Dan Crabtree
Publication Date: 2018
Industry: Cathodic Protection
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$20.00
$20.00

 Industry guidance such as European Standard EN-15280(1) and applied research by Pipeline Research Council International (PRCI)(2) highlight the interaction cathodic direct currents can have on pipeline corrosion influenced by alternating currents. Often, excessive levels of cathodic protection (or cathodic interference) can exacerbate AC-influenced corrosion. Conversely, effective management of cathodic protection in conjunction with monitoring the AC and DC effects on a pipeline can be a valued component of an optimized AC corrosion control strategy. This paper presents case histories where throttling down the cathodic protection was evaluated to determine the impact on reducing the AC corrosion threat. The investigations include the use of fast-response electrical resistance (ER) corrosion rate probe monitoring technology.

 Key Words: AC interference, mitigation, current density, AC-influenced corrosion, electrical resistance corrosion rate probe, cathodic protection, remote monitoring, computer modeling/simulations.

 

 Industry guidance such as European Standard EN-15280(1) and applied research by Pipeline Research Council International (PRCI)(2) highlight the interaction cathodic direct currents can have on pipeline corrosion influenced by alternating currents. Often, excessive levels of cathodic protection (or cathodic interference) can exacerbate AC-influenced corrosion. Conversely, effective management of cathodic protection in conjunction with monitoring the AC and DC effects on a pipeline can be a valued component of an optimized AC corrosion control strategy. This paper presents case histories where throttling down the cathodic protection was evaluated to determine the impact on reducing the AC corrosion threat. The investigations include the use of fast-response electrical resistance (ER) corrosion rate probe monitoring technology.

 Key Words: AC interference, mitigation, current density, AC-influenced corrosion, electrical resistance corrosion rate probe, cathodic protection, remote monitoring, computer modeling/simulations.

 

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This paper reviews the concerns of applying excessive levels of cathodic protection current to pipelines and the need for establishing an upper potential limit. Coating disbondment, hydrogen induced stress cracks, stress corrosion cracking, hard spots and the problems associated with measurement of a true polarized pipe-to-electrolyte potential are addressed.
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Cathodic Protection and MIC - Effects of local electrochemistry

Product Number: 51317--9452-SG
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The goal of this research was to improve the understanding of the mechanisms of cathodic protection (CP) by determining the interactions between corrosion and local chemical parameters, such as pH, under varying CP conditions, both in the absence and presence of MIC.
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