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Zirconoiate corrosion in dilute acidic and basic fluids at 180-700° C and 50 MPa

Published online by Cambridge University Press:  10 February 2011

J. Malmström ,
E. Reusser ,
R. Giere ,
G. R. Lumpkin ,
M. Düggelin ,
D. Mathys  and
R. Guggenheim
J. Malmström
Affiliation:
Institute of Mineralogy and Petrography, ETLH-Zentiurn, 8092 Zurich, Switzerland (malmi @erdcwvethz.ch)
E. Reusser
Affiliation:
Institute of Mineralogy and Petrography, ETLH-Zentiurn, 8092 Zurich, Switzerland (malmi @erdcwvethz.ch)
R. Giere
Affiliation:
Dept. of Earth and Atmospheric Sciences, Purdue Univ., West Lafayette, IN 47907-1397, USA
G. R. Lumpkin
Affiliation:
Australian Nuclear Science and Technology Organisation (ANSTIO), PMB 1, Menai, NSW 2234, Australia
M. Düggelin
Affiliation:
SEM-Laboratory, University of Basle, Bemoullistrasse 32, 4056 Basel, Switzerland
D. Mathys
Affiliation:
SEM-Laboratory, University of Basle, Bemoullistrasse 32, 4056 Basel, Switzerland
R. Guggenheim
Affiliation:
SEM-Laboratory, University of Basle, Bemoullistrasse 32, 4056 Basel, Switzerland
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Abstracti

Corrosion of zirconolite in a closed system at elevated temperature and pressure for various fluid compositions has been investigated by several analytical techniques. Together with previous studies, the results indicate a weak corrosion below 250° C at 5 MPa, Above 400° C, secondary TiO2 phases crystallize in acidic and neutral fluids on the corroded surfaces and in near-surface pores, At 550° C and above, zirconolite starts to be replaced by perovskite and “calzirtite” in basic fluids. Our results indicate that zirconolite is reasonably durable in acidic. neutral and basic fluids up to 500° C and 50 MPa which corresponds to deep borehole conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 165
Copyright
Copyright © Materials Research Society 1999

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References

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