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Effect of Surface Finish on Nuclear Glass Dissolution Rate

Published online by Cambridge University Press:  25 February 2011

J.L. Dussossoy ,
C. Dubois ,
E. Vernaz  and
A. Chambaudet
J.L. Dussossoy
Affiliation:
Rhône Valley Nuclear Research Center, DPR/SCD, BP 171, F 30205 Bagnols-sur-Cèze, France
C. Dubois
Affiliation:
Laboratoirde e Microanalyses Nucléaires, Route de Gray, 25030 Besançon Cedex, France
E. Vernaz
Affiliation:
Rhône Valley Nuclear Research Center, DPR/SCD, BP 171, F 30205 Bagnols-sur-Cèze, France
A. Chambaudet
Affiliation:
Laboratoirde e Microanalyses Nucléaires, Route de Gray, 25030 Besançon Cedex, France
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Abstract

The influence of the surface finish on nuclear glass dissolution was investigated. Seven different surface finishes were tested: a specimen as cut, three specimens polished with 220, 600 and 4000 mesh SiC paper and one with 1 μm diamond powder, a flame-polished specimen and a thermal rupture specimen.

The initial glass corrosion rates were measured after 7 and 28 days of Soxhlet leaching at 100°C. The surface finish of each glass coupon was also assessed by three-dimensional analysis before and after leaching for 28 days. Leaching solution analyses showed that the mean apparent leach rate for the first 7 days was highly dependent on the surface finish: the measured rates ranged from 3.8·g.m-2d-1 for the as-cut specimen to 1.3 g·m-2d-1 for the flamepolished specimen. The differences in the leach rates diminished considerably after 28 days of leaching: the mean rate measured between 7 and 28 days for the as-cut and polished specimens was identical (1.7 g·m-2d-1), but was still lower for the remaining two specimens. Three-dimensional surface analysis showed that leaching revealed surface defects (superficial microcracks) produced by cutting or polishing. These effects were less perceptible on the flame-polished or thermally ruptured specimens. The actual surface area of the cut and polished specimens exceeded the apparent geometrical area.

In another experiment, the leach rates measured for as-cut specimens and flamepolished specimens were measured over periods of five months or more using a thermogravity balance placed above the Soxhlet device. The experiment confirmed the existence of an initial period during which the dissolution rate for the as-cut specimen was much higher than the mean corrosion rate.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 257: Symposium – Scientific Basis for Nuclear Waste Management XV , 1991 , 109
Copyright
Copyright © Materials Research Society 1992

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References

REFERENCES

1. Grambow, B., “A General Rate Equation for Nuclear Waste Glass Corrosion”, in Scientific Basis for Nuclear Waste Management VIII, edited by Jantzen, C., Stone, J. and Ewing, R., Mat. Res. Soc. Proc., 44,15–24 (1985).Google Scholar
2. Vernaz, E. and Dussossoy, J.L., “Current State of Knowledge of Nuclear Waste Glass Corrosion Mechanisms: The Case of R7T7 Glass”, accepted for publication in Applied Geochemistry (Special Issue: 1991).Google Scholar
3. Harker, A.B. and Flintoff, J.F., “The Formation of Surface Layers and Reaction Products in the Leaching of Defense Borosilicate Nuclear Waste Glass”, Nuclear Technology, 76, 263–275 (1987).Google Scholar
4. Oh, M.S. and Oversby, V.M., “The Effect of Sample Preparation Methods on Glass Performance”, Mat. Res. Soc. Proc., 212, edited by Abrajano, T.A. and Johnson, L.H., pp 123–132 (1991).Google Scholar
5. Sadi, A., Mihoub, A., Dekhili, A. and Kayak, J., “L'Evolution de la surface du verre lors du rodage et son influence sur la résistance mécanique”, Verre et Réfractaire, Vol 3, No 1 (1989).Google Scholar
6. Delage, F. and Dussossoy, J.L., “R7T7 Glass Dissolution Rate Measurements Using a High-Temperature Soxhlet Device”, Mat. Res. Soc. Proc., 212, edited by Abrajano, T.A. and Johnson, L.H., pp 41–47 (1991).Google Scholar