Understanding the effectiveness of cathodic protection under disbonded coatings

Varela, F., Tan, M. Y. J. and Forsyth, M. 2015, Understanding the effectiveness of cathodic protection under disbonded coatings, Electrochimica acta, vol. 186, pp. 377-390, doi: 10.1016/j.electacta.2015.10.171.

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Title Understanding the effectiveness of cathodic protection under disbonded coatings
Author(s) Varela, F.ORCID iD for Varela, F. orcid.org/0000-0002-9055-7413
Tan, M. Y. J.ORCID iD for Tan, M. Y. J. orcid.org/0000-0002-0765-108X
Forsyth, M.ORCID iD for Forsyth, M. orcid.org/0000-0002-4273-8105
Journal name Electrochimica acta
Volume number 186
Start page 377
End page 390
Total pages 14
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-12-20
ISSN 0013-4686
Keyword(s) Cathodic shielding
Electrode array
Disbonded coating
Current distribution
Summary © 2015 Elsevier Ltd. All rights reserved. Factors affecting the effectiveness of cathodic protection under disbonded coatings were studied using a partially covered two dimensional electrode array that simulates a crevice under a disbonded coating and allows for the mapping of electrochemical currents under the influence of cathodic protection (CP). This technique enabled the study of the effects of major factors, including crevice gap size, solution conductivity and applied CP potential on the distribution and evolution of CP currents over the electrode array surface. The effect of each of these factors on the overall current distribution profile has been explained using a new electrochemical model. This model suggests that, despite the detrimental effect of cathodic shielding, the steel under disbonded areas could still be protected, independent of the crevice geometry and solution resistivity, by means of concentration polarization instead of direct electrochemical polarization. A set of conditions for maintaining CP potentials more negative than -850 mVCSE along disbonded coating areas was deduced from the proposed model and validated against potential profiles available in the literature. The possible practical implications of the current mapping technique used in this study for developing in-situ CP monitoring sensors has also been discussed.
Language eng
DOI 10.1016/j.electacta.2015.10.171
Field of Research 03 Chemical Sciences
09 Engineering
02 Physical Sciences
091207 Metals and Alloy Materials
Socio Economic Objective 850604 Energy Transmission and Distribution (excl. Hydrogen)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30080345

Document type: Journal Article
Collections: Institute for Frontier Materials
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