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Corrosion Induced Hydrogen Evolution on High Level Waste Overpack Materials in Synthetic Groundwaters and Chloride Solutions

Published online by Cambridge University Press:  26 February 2011

J. P. Simpson  and
R. Schenk
J. P. Simpson
Affiliation:
Sulzer Brothers Ltd. CH-8401 Winterthur, Switzerland.
R. Schenk
Affiliation:
Sulzer Brothers Ltd. CH-8401 Winterthur, Switzerland.
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Abstract

Hydrogen evolution from anoxic corrosion of cast steel overpacks in high-level waste repositories is an important issue for design if, as has been estimated, the hydrogen is prevented from escaping by diffusion by a low permeability compacted bentonite backfill.

Evaluation of the corrosion results showed three basic types of corrosion behaviour: general corrosion with oxide layer formation, unstable corrosion behaviour with pitting or macro-element formation and stable passive behaviour.

Cast steel containers under Swiss repository conditions are expected to suffer general corrosion with oxide layer formation. This behaviour gives the highest long term corrosion rates (2–5 μm/a) without local attack, above the 0.03–0.8 μm/a tolerated for hydrogen escape by diffusion but below the 20 μm/a assumed for overpack design.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 389
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

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