Evidence for internal diffusion of sulphide from groundwater into grain boundaries ahead of crack tip in Cu OFP copper

Esko Arilahti, Taru Lehtikuusi, Markus Olin, Timo Saario (Corresponding Author), Päivi Varis

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)

    Abstract

    Copper canister is a central technical barrier for radioactive release from high level nuclear waste in the so called KBS-3 concept planned to be used in Finland and Sweden for disposal of spent nuclear fuel. Canisters will be placed in the granitic bedrock at about 400–500 m depth and surrounded by a layer of bentonite clay planned to protect the canister from any chemical and mechanical damage, and especially acting as a diffusion barrier. While researching for the possibility of stress corrosion cracking in phosphorus microalloyed copper in presence of sulphides in the groundwater, indications were found for a new potential degradation mechanism involving internal diffusion of sulphide. This paper describes the evidence for the new mechanism and discusses the scenarios involving diffusion of sulphide onto the copper canister surface.
    Original languageEnglish
    Pages (from-to)134-137
    Number of pages3
    JournalCorrosion Engineering Science and Technology
    Volume46
    Issue number3
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

    Keywords

    • copper
    • corrosion
    • spent fuel disposal
    • sulphide

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