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Studying the cathodic disbondment of coatings using electrochemical impedance spectroscopy

conference contribution
posted on 01.01.2014, 00:00 authored by Fari Mahdavi, Mike Yongjun TanMike Yongjun Tan, Maria ForsythMaria Forsyth, Rajeev Gupta, Davi Abreu
The disbondment of protective organic coatings is a widely reported pipeline coating failure mode in the oil and gas industry. Traditional methods of evaluating cathodic disbondment of pipeline coatings are based on visual inspection of pipeline conditions, and laboratory testing of cathodic disbondment resistance (CDR) using standard methods such as ASTM G8. Although some other laboratory-based techniques, such as scanning kelvin probe and scanning acoustic microscopy have been used to study the cathodic disbondment (CD) of coatings, these are often difficult to apply in practical testing. Over the past decade, electrochemical impedance spectroscopy (EIS) has been employed as a potential method for measuring CD. This paper reports preliminary results from an EIS study designed to characterise CD behaviour of epoxy coatings under excessive cathodic protection. EIS data correlated well with the area of disbonded coating. Analysis of EIS data can provide valuable information on the initiation and rates of CD.

History

Event

Australasian Corrosion Association. Conference (2014 : Darwin, Northern Territory)

Pagination

1 - 12

Publisher

Australasian Corrosion Association

Location

Darwin, Northern Terroritory

Place of publication

[Darwin, Northern Terroritory]

Start date

15/11/2014

End date

18/11/2014

Language

eng

Publication classification

E Conference publication; E1 Full written paper - refereed

Copyright notice

2014, Australasian Corrosion Association

Editor/Contributor(s)

[Unknown]

Title of proceedings

Corrosion and Prevention : Proceedings of the 2014 Annual Conference of the Australasian Corrosion Association