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The Effects of Carbonate-Bicarbonate Concentration on Empirical Corrosion Diagram of Mild Steel as a Material of Geological Disposal Package for High Level Nuclear Wastes

Published online by Cambridge University Press:  10 February 2011

Guen Nakayama ,
Yuichi Fukaya  and
Masatsune Akashi
Guen Nakayama
Affiliation:
Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd. 3–1–15 Toyosu, Koto-ku Tokyo 135Japan, [email protected]
Yuichi Fukaya
Affiliation:
Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd. 3–1–15 Toyosu, Koto-ku Tokyo 135Japan, [email protected]
Masatsune Akashi
Affiliation:
Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd. 3–1–15 Toyosu, Koto-ku Tokyo 135Japan, [email protected]
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Abstract

In the scheme for geological disposal of high level radioactive nuclear wastes, the burial pit is to be isolated from the sphere of human life by a multiple-barrier system, which consists of an artificial barrier, composed of a canister, an overpack and a bentonite cushioning layer, and a natural barrier, which is essentially the bedrock. As the greatest as well as essentially the sole detriment to its integrity would be corrosion by groundwater. The groundwater comes to it seeping through the bentonite zone, thereby attaining conceivably the pH of transition from general corrosion to passivity, pHd, the behaviors of mild steel in such a groundwater environment have been examined. It has been shown that the pHd is lowered (enlargement of the passivity domain) with rising temperature and carbonate-bicarbonate concentration, while it is raised (enlargement of the general corrosion region) with increasing concentrations of chloride and sulfate ions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 451: Symposium P – Electrochemical Synthesis and Modification , 1996 , 567
Copyright
Copyright © Materials Research Society 1997

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References

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