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
Pagination
522-530
Location
Brisbane, Queensland
Start date
2013-11-10
End date
2013-11-13
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