Experimental validation of electrochemical tomography to locate and quantify localized corrosion
dc.contributor.author
van Ede, Meeke Carline
dc.contributor.author
Fichtner, Andreas
dc.contributor.author
Angst, Ueli
dc.contributor.editor
Diouri, Abdeljebbar
dc.contributor.editor
Khachani, Nacer
dc.contributor.editor
Saadi, Mohamed
dc.contributor.editor
Ez-zaki, Hassan
dc.contributor.editor
Hadouchi, Mohammed
dc.contributor.editor
Elhachmi, Driss
dc.date.accessioned
2024-03-05T08:32:43Z
dc.date.available
2023-12-31T10:11:53Z
dc.date.available
2024-03-05T08:32:43Z
dc.date.issued
2023
dc.identifier.uri
http://hdl.handle.net/20.500.11850/649802
dc.description.abstract
We present a step in the development of a novel non-destructive technique, called electrochemical tomography (ECT), which is able to locate and quantify localized corrosion of steel in porous media. In this work we show the first experimental validation of ECT with a controlled laboratory setup.
Localized corrosion in porous media, such as the corrosion of buried pipelines and reinforced concrete, remains one of the largest problems in civil engineering. It often leads to the premature deterioration of engineering structures. To detect corrosion at an early stage, non-destructive testing methods are essential. Electrochemical tomography was developed to measure the local corrosion rate reliably and accurately.
ECT uses electrical potential measurements, taken at the surface of the porous medium, in combination with a numerical model, to obtain the size and location of the actively corroding steel (the anode), as well as the corresponding corrosion rate. The technique relies on the accuracy of the numerical model, which simulates the electrical potential field in the porous medium as a function of the anode size, location, the medium’s electrical resistivity and externally applied currents at the surface.
We investigate the accuracy of this numerical model using a controlled experimental setup in the laboratory, with a well-defined macro-cell corrosion system and a constant electrolyte environment. We show that if the kinetics of the steel are understood, in terms of the exchange current densities and Tafel slopes of the main corrosion reactions, we are able to accurately model the electrical potential field in the medium. Furthermore, we show that the model accurately handles externally applied currents in the range applicable in ECT. This gives us confidence that assumptions made on the numerical model, related to the electrochemical reactions taking place, are justified, and it brings us closer to the application of ECT on engineering structures.
en_US
dc.language.iso
en
en_US
dc.publisher
Association ASMATEC
en_US
dc.subject
Electrochemical reactions
en_US
dc.subject
Corrosion
en_US
dc.subject
Numerical model
en_US
dc.title
Experimental validation of electrochemical tomography to locate and quantify localized corrosion
en_US
dc.type
Other Conference Item
ethz.book.title
Abstacts & Proceedings CMSS23: 4rd International Congress on Materials & Structural Stability
en_US
ethz.pages.start
O5-378
en_US
ethz.size
1 p.
en_US
ethz.event
4th International Congress on Materials & Structural Stability & RILEM Spring Convention (RSC-CMSS 2023)
en_US
ethz.event.location
Rabat, Morocco
en_US
ethz.event.date
March 6-11, 2023
en_US
ethz.notes
Conference lecture held on March 9, 2023.
en_US
ethz.publication.place
Rabat
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02606 - Institut für Baustoffe (IfB) / Institute for Building Materials::09593 - Angst, Ueli / Angst, Ueli
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02606 - Institut für Baustoffe (IfB) / Institute for Building Materials::09593 - Angst, Ueli / Angst, Ueli
en_US
ethz.relation.isPartOf
https://www.rsc-cmss23.asmatec.org/Abstract%20Proceedings%20CMSS23.php
ethz.date.deposited
2023-12-31T10:11:53Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2024-03-05T08:34:40Z
ethz.rosetta.lastUpdated
2025-02-14T08:25:10Z
ethz.rosetta.versionExported
true
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