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Electrochemical impedance spectroscopy as a tool to measure cathodic disbondment on coated steel surfaces: capabilities and limitations

Mahdavi, Fariba, Tan, Mike Y. J. and Forsyth, Maria 2015, Electrochemical impedance spectroscopy as a tool to measure cathodic disbondment on coated steel surfaces: capabilities and limitations, Progress in organic coatings, vol. 88, pp. 23-31, doi: 10.1016/j.porgcoat.2015.06.010.

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Title Electrochemical impedance spectroscopy as a tool to measure cathodic disbondment on coated steel surfaces: capabilities and limitations
Author(s) Mahdavi, FaribaORCID iD for Mahdavi, Fariba orcid.org/0000-0003-1595-212X
Tan, Mike Y. J.ORCID iD for Tan, Mike Y. J. orcid.org/0000-0002-0765-108X
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Journal name Progress in organic coatings
Volume number 88
Start page 23
End page 31
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-11
ISSN 0300-9440
Keyword(s) Science & Technology
Physical Sciences
Technology
Chemistry, Applied
Materials Science, Coatings & Films
Chemistry
Materials Science
Organic coating
Cathodic protection
Cathodic disbondment
Electrochemical impedance spectroscopy (EIS)
ORGANIC COATINGS
MILD-STEEL
DELAMINATION
DEGRADATION
PROTECTION
CORROSION
METALS
MECHANISM
ADHESION
EIS
Summary The disbondment of protective organic coatings under excessive cathodic protection potentials is a widely reported coating failure mechanism. Traditional methods of evaluating cathodic disbondment are based on ex situ visual inspection of coated metal surfaces after being exposed to standard cathodic disbondment testing conditions for a long period of time. Although electrochemical impedance spectroscopy (EIS) has been employed as an effective means of evaluating various anti-corrosion properties of organic coatings; its application for assessing the cathodic disbondment resistance of coatings has not been sufficiently exploited. This paper reports an experimental study aimed at developing EIS into a tool for in situ measurement and monitoring of cathodic disbondment of coatings. A clear correlation between EIS parameters and the disbonded coating areas has been confirmed upon short term exposure of epoxy-coated steel electrodes to cathodic disbondment conditions; however the degree of this correlation was found to decrease with the extension of exposure duration. This observation suggests that EIS loses its sensitivity with the propagation of coating disbondment, and that in order to achieve quantitative determination of the coating cathodic disbondment localized EIS measurements are required to measure the parameters related to local disbonded areas.
Language eng
DOI 10.1016/j.porgcoat.2015.06.010
Field of Research 030301 Chemical Characterisation of Materials
091202 Composite and Hybrid Materials
091207 Metals and Alloy Materials
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 850604 Energy Transmission and Distribution (excl. Hydrogen)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078728

Document type: Journal Article
Collection: Institute for Frontier Materials
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