A review of techniques for the monitoring of cathodic shielding and corrosion under disbonded coatings

F. Varela, M. Y.J. Tan, M. Forsyth, B. Hinton, C. Bonar

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

4 Citations (Scopus)

Abstract

The mitigation of external corrosion of energy pipelines by a combination of barrier coatings and Cathodic Protection (CP) is not always effective. Even when design specifications are properly met, the shielding of cathodic protection current from reaching steel surface by disbonded barrier coatings, often referred to as cathodic shielding, may lead to severe corrosion problems such as deep pitting, high and near neutral pH Stress Corrosion Cracking (SCC) and Microbiologically Induced Corrosion (MIC). Unfortunately, current indirect assessment methods used in the pipeline industry have serious difficulties in detecting such corrosion problems. This paper provides a brief review of current techniques and their limitations when being applied under complex buried pipeline environmental conditions. The main purpose is to identify potential methods that could be utilised in the design of new monitoring probes specific for the monitoring of cathodic shielding and corrosion of disbonded coatings in the pipeline industry.

Original languageEnglish
Title of host publicationAnnual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013
PublisherAustralasian Corrosion Association (ACA)
Pages522-530
Number of pages9
ISBN (Electronic)9781634394369
Publication statusPublished - 2013
Externally publishedYes
EventAustralasian Corrosion Association (ACA) Conference 2013: Corrosion and Prevention - Brisbane, Australia
Duration: 10 Nov 201313 Nov 2013

Conference

ConferenceAustralasian Corrosion Association (ACA) Conference 2013
Abbreviated titleCP 2013
Country/TerritoryAustralia
CityBrisbane
Period10/11/1313/11/13

Keywords

  • Cathodic protection
  • Cathodic shielding
  • Coating
  • Corrosion probe
  • Pipeline

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