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The Influence of Preoxidation on the Corrosion of Copper Nuclear Waste Canisters in Aqueous Anoxic Sulphide Solutions

Published online by Cambridge University Press:  19 October 2011

Jared M. Smith ,
Z. Qin ,
J. C. Wren  and
D. W. Shoesmith
Jared M. Smith
Affiliation:
jsmith6@uwo.ca, The University of Western Ontario, Chemistry, 1151 Richmond St., London, N6A5B7, Canada, 519-661-2111 *86357, 519-661-3022
Z. Qin
Affiliation:
zqin@uwo.ca, The University of Western Ontario, Chemistry, 1151 Richmond St., London, N6A5B7, Canada
J. C. Wren
Affiliation:
jcwren@uwo.ca, The University of Western Ontario, Chemistry, 1151 Richmond St., London, N6A5B7, Canada
D. W. Shoesmith
Affiliation:
dwshoesm@uwo.ca, The University of Western Ontario, Chemistry, 1151 Richmond St., London, N6A5B7, Canada
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Abstract

Scandinavian/Canadian high-level nuclear waste repository conditions are expected to evolve from initially warm and oxic to eventually cool and anoxic. During the warm oxic period, corrosion products will accumulate on the container surface. These deposits could impede the reaction of Cu with aqueous sulphide, the only reaction that could lead to the significant accumulation of additional corrosion damage under the long-term anoxic conditions. The kinetics of reaction of Cu with aqueous sulphide solutions have been studied using electrochemical and surface analytical techniques. Corrosion potential measurements were used to follow the evolution of the surface as oxides/hydroxides were converted to sulphides in the sulphide concentration range 10-5 to 10-3 mol/L. Changes in composition were followed by in-situ Raman spectroscopy. Of critical importance is whether or not a period of preoxidation of a Cu container surface can prevent subsequent reaction of the surface with remotely produced sulphide

Keywords

Cucorrosionwaste management
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 985: Symposium NN – Scientific Basis for Nuclear Waste Management XXX , 2006 , 0985-NN08-11
Copyright
Copyright © Materials Research Society 2007

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