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.
Attached Files
Name
Description
MIMEType
Size
Downloads
Title
Electrochemically monitoring localized corrosion patterns and CP effectiveness under disbonded coatings
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)
Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.