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Corrosion Behaviour of Truw Base and Reference Glasses+

Published online by Cambridge University Press:  25 February 2011

P. Van Iseghem ,
W. Timmermans  and
R. De Batist
P. Van Iseghem
Affiliation:
Materials Science Department, S.C.K./C.E.N., B-2400 MOL (Belgium)
W. Timmermans
Affiliation:
Materials Science Department, S.C.K./C.E.N., B-2400 MOL (Belgium)
R. De Batist
Affiliation:
Also Rijksuniversitair Centrum Antwerpen, B-2020 ANTWERPEN (Belgium)
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Abstract

The corrosion behaviour of five TRUW base and reference glasses in distilled water has been investigated for times up to 8 months. The glasses were chosen to evaluate some of the main features of the basaltic slag as produced by the prototype FLK incinerator, i.e. the iron valence state and the relative influence of Al2O3 vs FeOx. Diffusion processes control the corrosion for times below 80 d at 90°C at the SA.V-1 value currently considered (1 cm-1), resulting in the formation of complex films enriched in Al, Fe and Mg over 200 nm thick. The partial replacement of 10 mole 7 Fe2Ox by Al2O3 improves the chemical resistance and strongly accelerates saturation of the leachate for Si, and apparently also for Na and K. The iron valence

state in the glass does not seem to influence the corrosion behaviour. When leaching at temperature up to 200°C, the surfaces of all glasses crystallize, while the corrosion rates do not decrease with time. At SA.V−1 ≠ 0.1 cm−1 , 90°C, the weight losses increase by a factor up to 10 relative to SA.V−1 ≠ 1 cm−1 , 90°C, and the initial diffusion controlled stage might be followed by matrix dissolution reactions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 26: Symposium D – Scientific Basis for Nuclear Waste Management VII , 1983 , 527
Copyright
Copyright © Materials Research Society 1984

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Footnotes

+

Supported in part by the Commission of the European Communities.

References

REFERENCES

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