Electrochemical method for studying localized corrosion beneath disbonded coatings under cathodic protection

Varela, Facundo, Tan, M.Y.J. and Forsyth, Maria 2015, Electrochemical method for studying localized corrosion beneath disbonded coatings under cathodic protection, Journal of the electrochemical society, vol. 162, no. 10, pp. C515-C527, doi: 10.1149/2.0301510jes.

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Title Electrochemical method for studying localized corrosion beneath disbonded coatings under cathodic protection
Author(s) Varela, Facundo
Tan, M.Y.J.ORCID iD for Tan, M.Y.J. orcid.org/0000-0002-0765-108X
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Journal name Journal of the electrochemical society
Volume number 162
Issue number 10
Start page C515
End page C527
Total pages 13
Publisher Electrochemical Society
Place of publication Pennington, N. J.
Publication date 2015-01-01
ISSN 0013-4651
Summary This paper presents a new method for measuring localized corrosion under disbonded coatings by means of an electrochemical sensor, denoted differential aeration sensor (DAS). It measures the distribution of electrochemical currents over an electrode array surface partially covered by a crevice that simulates a disbonded coating. The DAS has been evaluated using immersion tests at open circuit and under cathodic protection (CP) conditions. Under both conditions, anodic as well as cathodic current densities were detected within the crevice. A fundamental understanding for the detection of anodic currents under CP has been explained in terms of basic electrochemistry. Based on the current distribution data provided by the sensor, two different analysis methods have been used to estimate corrosion and its distribution. These methods consisted of a direct application of Faraday's Law to the anodic currents detected by the array, and on a sensor-specific method denoted corrected currents' method. It has been demonstrated that under diffusion controlled conditions this latter method produces a better corrosion estimation than the direct application of Faraday's Law. The corrected currents' method allowed the estimation of corrosion patterns outside the crevice under CP. Good correlation between electrochemical calculations and surface profilometry results has been obtained.
Language eng
DOI 10.1149/2.0301510jes
Field of Research 091207 Metals and Alloy Materials
030604 Electrochemistry
Socio Economic Objective 870302 Metals (e.g. Composites
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Electrochemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078485

Document type: Journal Article
Collections: School of Engineering
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