Development of a rapid screening test for SCC susceptibility of copper in disposal vault conditions

Iva Betova, Martin S. Bojinov, Jussi Heinonen, Petri Kinnunen, Christina Lilja, Timo Saario

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Stress corrosion cracking is a potential failure mechanism of the copper canister proposed to be the main corrosion barrier in the Scandinavian design of the final nuclear waste disposal vault. The main target in SCC-oriented research is to determine the limiting values for the critical concentration of harmful species, the potential range in which these species cause SCC and the threshold stress level required for SCC. The present paper attempts to redefine the criteria for SCC susceptibility of copper in acetate solutions through analysis of potentiodynamic curves using both rotating disc and thin plate electrodes insulated on one side. A potential range in which the current densities at a slow sweep rate are lower than those at a fast sweep rate exists for Cu in 0.001 M - 0.1 M acetate. However, the values of the current densities within this range are significantly smaller than those postulated for active anodic dissolution, implying dissolution mediated by a surface film. New criteria for the SCC susceptibility of pure copper in acetate solutions have been formulated through Stern-Geary analysis of the polarisation curves. Several electrochemical characteristics, such as the current density at the positive crossover potential, the ratio between the corrosion current densities determined from the slow and fast sweeps, as well as the anodic current density in a fast sweep show a clear jump for concentrations between 0.01 M and 0.05 M. This, however, cannot yet be considered as an indication of SCC susceptibility at higher acetate concentrations, as evidenced by complementary SSRT tests.
    Original languageEnglish
    Title of host publicationSymposium - Scientific Basis for Nuclear Waste Management XXIX
    PublisherCambridge University Press
    Number of pages8
    DOIs
    Publication statusPublished - 2005
    MoE publication typeA4 Article in a conference publication
    Event29th MRS Symposium on the Scientific Basis for Nuclear Waste Management - Ghent, Belgium
    Duration: 12 Sep 200516 Sep 2005
    Conference number: 29

    Publication series

    SeriesMRS Online Proceedings
    Volume932
    ISSN1946-4274

    Conference

    Conference29th MRS Symposium on the Scientific Basis for Nuclear Waste Management
    CountryBelgium
    CityGhent
    Period12/09/0516/09/05

    Keywords

    • copper
    • stress corrosion cracking
    • nuclear waste disposal

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  • Cite this

    Betova, I., Bojinov, M. S., Heinonen, J., Kinnunen, P., Lilja, C., & Saario, T. (2005). Development of a rapid screening test for SCC susceptibility of copper in disposal vault conditions. In Symposium - Scientific Basis for Nuclear Waste Management XXIX [31.1] Cambridge University Press. MRS Online Proceedings , Vol.. 932 https://doi.org/10.1557/PROC-932-31.1