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Zirconolite corrosion in dilute acidic and basic fluids at 180-700 ˚C and 50 MPa

Malmström J., Reusser E., Gieré R., Lumpkin G.R., Düggelin M., Mathys D., Guggenheim R.
1 999
Materials Research Society, Symposium Proceedings
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.
EES Authors: 
Reto Gieré

Department of Earth and Environmental Science / University of Pennsylvania, 251 Hayden Hall, 240 South 33rd Street, Philadelphia, PA 19104-6316