Studying the cathodic disbondment of coatings using electrochemical impedance spectroscopy
Mahdavi, F, Tan, MYJ, Forsyth, M, Gupta, R and Abreu, D 2014, Studying the cathodic disbondment of coatings using electrochemical impedance spectroscopy, in Corrosion and Prevention : Proceedings of the 2014 Annual Conference of the Australasian Corrosion Association, Australasian Corrosion Association, [Darwin, Northern Terroritory], pp. 1-12.
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.
Language
eng
Indigenous content
off
Field of Research
030604 Electrochemistry 091207 Metals and Alloy Materials
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