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Application of an On-line Corrosion Probe and a Reference Electrode for Copper Corrosion Studies in Repository Conditions

Published online by Cambridge University Press:  01 February 2011

Iva Betova ,
Jussi Heinonen ,
Petri Kinnunen ,
Christina Lilja ,
Esko Ruokola  and
Timo Saario
Iva Betova
Affiliation:
VTT Technical Research Centre of Finland, VTT Industrial Systems, Espoo, FIN-02044, Finland
Jussi Heinonen
Affiliation:
Radiation and Nuclear Safety Authority, Finland, VTT Industrial Systems, Espoo, FIN-02044, Finland
Petri Kinnunen
Affiliation:
VTT Technical Research Centre of Finland, VTT Industrial Systems, Espoo, FIN-02044, Finland
Christina Lilja
Affiliation:
Swedish Nuclear Power Inspectorate, Sweden, VTT Industrial Systems, Espoo, FIN-02044, Finland
Esko Ruokola
Affiliation:
Radiation and Nuclear Safety Authority, Finland, VTT Industrial Systems, Espoo, FIN-02044, Finland
Timo Saario
Affiliation:
VTT Technical Research Centre of Finland, VTT Industrial Systems, Espoo, FIN-02044, Finland
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Abstract

Two sensors, an on-line corrosion sensor based on the wire-resistance probe design and a reference electrode which are applicable in repository conditions are introduced. Both sensors have been tested in simulated repository conditions in bentonite saturated with highly saline groundwater at 80 °C temperature and 14 MPa pressure up to 150 h exposure. In addition, it has been demonstrated that after an initial transient period of ca. 5–8 h, Cu corrosion in highly saline groundwater filled with bentonite becomes undetectably low probably because of the anoxic conditions reached in the free groundwater. At the same time, the measured corrosion potential of Cu is still in the active corrosion region. Furthermore, redox potentials in the wetted bentonite remain significantly higher than in the free groundwater. This may mean that the decomposition of oxygen contained in the pores of the bentonite is a process occurring in a time scale larger than that of the present experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 429
Copyright
Copyright © Materials Research Society 2004

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References

REFERENCES

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