Identification of the Cathode Reaction Accompanied with Overpack Corrosion

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<jats:title>ABSTRACT</jats:title><jats:p>Cathode reaction on overpack corrosion in the geological repository environments of radioactive waste was identified from corrosion experiments of carbon steel specimens. Carbon steel specimens were encapsulated in degassed glass ampoules with various solutions which were prepared by distilled water degassed by Ar gas bubbling, and set in a thermostatic bath for several weeks. In the X-ray diffraction and X-ray photochemical spectroscopy, crystalline Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> and Fe<jats:sub>2</jats:sub>(OH)<jats:sub>2</jats:sub>CO<jats:sub>3</jats:sub>, and amorphous Fe(OH)<jats:sub>2</jats:sub> were mainly detected on specimens which were immersed into distilled water, high concentration of sodium hydrogen carbonate solution, and low concentration of sodium hydrogen carbonate solution and sodium sulfate solution, respectively. Only hydrogen gas was detected in a gas phase analysis, indicating that hydrogen generation reaction was the dominant cathode reaction in the anoxic condition expected in geological repository environments.</jats:p>

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  • MRS Proceedings

    MRS Proceedings 1475 2012-01-01

    Springer Science and Business Media LLC

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