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Real-time monitoring of copper corrosion at the Äspö HRL
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Corrosion Science (closed 20081231).
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Corrosion Science (closed 20081231).ORCID iD: 0000-0002-4431-0671
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2004 (English)Conference paper (Refereed)
Abstract [en]

In Sweden the principal strategy for high-level radioactive waste disposal is to enclose the spent nuclear fuel in tightly sealed copper canisters that are embedded in bentonite clay about 500 m down in the Swedish bed-rock. Initially, a limited amount of air will be left in a repository after emplacement. The entrapped oxygen will be consumed through reactions with minerals in the rock and the bentonite and also through microbial activity. After the oxygen has been consumed in the repository, after a few hundred years at the very most, corrosion will be controlled completely by the supply of dissolved sulphide to the canister. The present work concerns the oxic period after emplacement. The main hypothesis is that the average corrosion rate of the canister under oxic conditions will be less than 7 μm/year, and that pitting will only be possible under these conditions. The Äspö Hard Rock Laboratory offers a realistic environment for different experiments and tests under the conditions that will prevail in a deep repository. Real-time monitoring of copper corrosion is presently performed with polarization resistance, harmonic distortion analysis and electrochemical noise techniques. The first two techniques are used to derive information regarding the general corrosion rate and the third to derive information regarding localized corrosion. In order to support these measurements at Äspö, laboratory work is also performed at the Royal Institute of Technology in Stockholm using the very same corrosion monitoring equipment and also other equipment and techniques. Copper coupons are also exposed at Äspö. Results from the work at Äspö and in Stockholm are presented with an emphasis on the gained information concerning localized corrosion. The recorded corrosion rates at Äspö are well below the value given above, and the recorded localization factors are interpreted as indicating only a slight tendency to local attack.

Place, publisher, year, edition, pages
, EUROCORR 2004 - European Corrosion Conference: Long Term Prediction and Modelling of Corrosion
Keyword [en]
Copper, General corrosion, Groundwater, Localized corrosion, Real-time corrosion monitoring, Bentonite clay, Copper canisters, Copper coupon, Corrosion monitoring, Electrochemical noise technique, General corrosion rate, Hard rocks, Harmonic distortion analysis, High level radioactive waste disposal, Information concerning, Laboratory work, Local attack, Localization factor, Microbial activities, Oxic conditions, Polarization resistances, Real time corrosion monitoring, Real time monitoring, Realistic environments, Royal Institute of Technology, Spent nuclear fuels, Stockholm, Aluminum corrosion, Bentonite, Copper corrosion, Dissolved oxygen, Electrochemical corrosion, Oxygen supply, Radioactive waste disposal, Radioactive wastes, Corrosion rate
National Category
Corrosion Engineering
URN: urn:nbn:se:kth:diva-156918ScopusID: 2-s2.0-84889902793OAI: diva2:770274
European Corrosion Conference: Long Term Prediction and Modelling of Corrosion, EUROCORR 2004, 12-16 September 2004, Nice, France

QC 20141210

Available from: 2014-12-10 Created: 2014-12-04 Last updated: 2014-12-10Bibliographically approved

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Rosborg, BoPan, Jinshan
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