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Electrochemically monitoring localized corrosion patterns and CP effectiveness under disbonded coatings

Varela, Facundo, Forsyth, Maria and Tan, Mike Y. J. 2015, Electrochemically monitoring localized corrosion patterns and CP effectiveness under disbonded coatings, in NACE 2015: Proceedings of the International Corrosion Conference and Expo Series, NACE International, Houston, Tex., pp. 1-10.

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Title Electrochemically monitoring localized corrosion patterns and CP effectiveness under disbonded coatings
Author(s) Varela, Facundo
Forsyth, MariaORCID iD for Forsyth, Maria orcid.org/0000-0002-4273-8105
Tan, Mike Y. J.ORCID iD for Tan, Mike Y. J. orcid.org/0000-0002-0765-108X
Conference name NACE Corrosion Conference and Expo (2015 : Dallas, Tex.)
Conference location Dallas, Tex.
Conference dates 15-19 Mar. 2015
Title of proceedings NACE 2015: Proceedings of the International Corrosion Conference and Expo Series
Publication date 2015
Start page 1
End page 10
Total pages 10
Publisher NACE International
Place of publication Houston, Tex.
Summary This paper presents new experimental evidences on the capability of a novel electrochemical corrosion monitoring sensor, which was recently conceived, for measuring localized corrosion under disbonded pipeline coatings. The sensor's design includes an artificial crevice for simulating the conditions developed under disbonded coatings and an electrode array for measuring current density distribution over its surface. The sensor capabilities were further evaluated by studying the dependency of corrosion patterns and current density distribution on the Cathodic Protection (CP) potential applied upon immersion in an aqueous environment. At the less negative CP potential, a good correlation was found between the inhomogeneous corrosion distribution under the disbonded coating as measured by the sensor and actual metal loss and corrosion attack observed on its surface at the end of the test. At more negative CP potentials no corrosion was detected or observed on the sensor's surface. In addition, characteristic changes in the cathodic current distribution at different CP potentials illustrated the possibility of employing the sensor to obtain valuable feedback on the performance of a given CP setup, without requiring its interruption or compensation of IR-drops. Furthermore, the sensor's capability to detect some of the effects of overprotection were shown at the most negative CP potential applied.
ISBN 9781510801882
ISSN 0361-4409
Language eng
Field of Research 030301 Chemical Characterisation of Materials
091207 Metals and Alloy Materials
091202 Composite and Hybrid Materials
Socio Economic Objective 850604 Energy Transmission and Distribution (excl. Hydrogen)
HERDC Research category E1 Full written paper - refereed
ERA Research output type E Conference publication
Copyright notice ©2015, NACE International
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078733

Document type: Conference Paper
Collections: School of Engineering
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