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• W846805976 abstract "The present report accounts for studies on copper corrosion performed at Studsvik Material AB during 1997-1999 on commission by SKI. The work has been focused on localised corrosion and electrochemistry of copper in the repository environment. The current theory of localised copper corrosion is not consistent with recent practical experiences. It is therefore desired to complete and develop the theory based on knowledge about the repository environment and evaluations of previous as well as recent experimental and field results. The work has therefore comprised a thorough compilation and up-date of literature on copper corrosion and on the repository environment. A selection of a 'working environment', defining the chemical parameters and their ranges of variation has been made and is used as a fundament for the experimental part of the work. Experiments have then been performed on the long-range electrochemical behaviour of copper in selected environments simulating the repository. Another part of the work has been to further develop knowledge about the thermodynamic limits for corrosion in the repository environment. Some of the thermodynamic work is integrated here. Especially thermodynamics for the system Cu-Cl-H-O up to 150 deg C and high chloride concentrations are outlined. However, there is also a rough overview of the whole system Cu-Fe-Cl-S-C-H-O as a fundament for the discussion. Data are normally accounted as Pourbaix diagrams. Some of the conclusions are that general corrosion on copper will probably not be of significant importance in the repository as far as transportation rates are low. However, if such rates were high, general corrosion could be disastrous, as there is no passivation of copper in the highly saline environment. The claim on knowledge of different kinds of localised corrosion and pitting is high, as pitting damages can shorten the lifetime of a canister dramatically. Normal pitting can happen in oxidising environment, but there is probably a chloride induced passivation mechanism slowing down such pitting in the long run. A mechanism for this is proposed here. A special family of local attacks, based on the growth of sulphide, oxide/hydroxide and even carbonate/malachite whiskers, could also happen in the repository. It has been demonstrated in the experimental part of this work that whiskers can grow on copper in repository related environments containing sulphide. The chemical composition of such whiskers and their growth mechanism is treated in the present work. The integrity related consequences for the copper substrate on which they grow still remains, however, to be investigated." @default.
• W846805976 created "2016-06-24" @default.
• W846805976 creator A5083089868 @default.
• W846805976 creator A5089995048 @default.
• W846805976 date "1999-12-01" @default.
• W846805976 modified "2023-09-27" @default.
• W846805976 title "Corrosion of the copper canister in the repository environment" @default.
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