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

conference contribution
posted on 01.01.2013, 00:00 authored by Bob VarelaBob Varela, Mike Yongjun TanMike Yongjun Tan, Maria ForsythMaria Forsyth, Bruce HintonBruce Hinton, C Bonar
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.

History

Event

Australasian Corrosion Association. Conference (2013 : Brisbane, Queensland)

Pagination

522 - 530

Publisher

Australasian Corrosion Association

Location

Brisbane, Queensland

Place of publication

[Brisbane, Qld.]

Start date

10/11/2013

End date

13/11/2013

ISBN-13

9781634394369

Language

eng

Publication classification

E1.1 Full written paper - refereed

Copyright notice

2013, Australasian Corrosion Association

Editor/Contributor(s)

[Unknown]

Title of proceedings

Corrosion and Prevention 2013 : Proceedings of the Annual Conference of the Australasian Corrosion Association

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