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Studying the cathodic disbondment of coatings using electrochemical impedance spectroscopy
conference contribution
posted on 2014-01-01, 00:00 authored by Fari Mahdavi, Mike Yongjun TanMike Yongjun Tan, Maria ForsythMaria Forsyth, Rajeev Gupta, Davi AbreuThe 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.
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Event
Australasian Corrosion Association. Conference (2014 : Darwin, Northern Territory)Pagination
1 - 12Publisher
Australasian Corrosion AssociationLocation
Darwin, Northern TerroritoryPlace of publication
[Darwin, Northern Terroritory]Start date
2014-11-15End date
2014-11-18Language
engPublication classification
E Conference publication; E1 Full written paper - refereedCopyright notice
2014, Australasian Corrosion AssociationEditor/Contributor(s)
[Unknown]Title of proceedings
Corrosion and Prevention : Proceedings of the 2014 Annual Conference of the Australasian Corrosion AssociationUsage metrics
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