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A Comparative Experimental Study of Glass Stability in Seawater and Distilled Water

Published online by Cambridge University Press:  28 February 2011

Zhihong Zhou  and
W. S. Fyfe
Zhihong Zhou
Affiliation:
Department of Geology, University of Western Ontario, London, Ontario, Canada N6A 5B7
W. S. Fyfe
Affiliation:
Department of Geology, University of Western Ontario, London, Ontario, Canada N6A 5B7
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Abstract

Both PNL76−68 and ABS-118 glasses show greater stability in seawater (SW) than in distilled and deionized water (DDW), in the MCC-1 90°C corrosion test. After 180 days of corrosion, the boron release from PNL76- 68 and ABS-118 glasses is about five and two times lower respectively in SW than in DDW. Seawater leachates show less increase in pH than DDW leachates. Glass corroded in SW shows little or no total weight loss. Significant amounts of Mg from SW have been added to the surface layers of both types of glass. Mg-silicates were found in surface layers formed in SW, whereas Zn- and Fe-silicates in surface layers formed in DDW. Shortterm leaching tests in D2O, NaCl and MgCl2 solutions suggested that high salt content in leachant can impede glass hydration. Both silica saturation and Mg diffusion may be responsible for greater stability of the glasses in SW than in DDW.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 112: Symposium P – Scientific Basis for Nuclear Waste Management XI , 1987 , 725
Copyright
Copyright © Materials Research Society 1988

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