Corrosion Products from Carbon Steel Formed in Compacted Bentonite under Reducing Conditions

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概要

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• For safety assessment of high-level radioactive waste disposal, the sorption of radionuclides on corrosion products that migrate from overpack material into compacted bentonite and the dissolution of corrosion products, which may cause the alteration of smectite to Fe-smectite due to the increase in Fe2+ concentration in the pore water, are possibly dependent on the kinds of minerals formed in compacted bentonite as corrosion products. In this study, carbon steel, previously corroded electrochemically under aerobic conditions, was left in contact with compacted Kunigel V1 and Kunipia F under reducing conditions for 3 to 4 years at room temperature. The corrosion products, which migrated from the carbon steel into compacted bentonite, were investigated by selective dissolution analysis, which can estimate the crystallinity of Fe-bearing compounds, and by spectrophotometry to determine the valence of iron in the corrosion products. From these analyses, the corrosion products in compacted bentonite were identified to be amorphous, noncrystalline or poorly ordered Fe(OH)2 and Fe(OH)3. Furthermore, the alteration of smectite to Fe-smectite in compacted bentonite was analyzed by X-ray diffraction (XRD). In the XRD analysis, Fe-smectite was not identified in Kunipia F from the variation in basal spacing as a function of relative humidity.

• 一般社団法人 日本原子力学会の論文
• 2008-08-01

著者

• IDEMITSU Kazuya

  Department of Applied Quantum Physics & Nuclear Engineering, Kyushu University

• Idemitsu Kazuya

  Department Of Applied Quantum Physics And Nuclear Engineering Graduate School Of Engineering Kyushu

• ISHIDERA Takamitsu

  Japan Atomic Energy Agency

• XIA Xiaobin

  Department of Applied Quantum Physics and Nuclear Engineering, Graduate School of Engineering, Kyush

• KIKUCHI Yoshio

  Department of Applied Quantum Physics and Nuclear Engineering, Graduate School of Engineering, Kyush

• Kikuchi Yoshio

  Department Of Applied Quantum Physics And Nuclear Engineering Graduate School Of Engineering Kyushu

• Xia Xiaobin

  Department Of Applied Quantum Physics And Nuclear Engineering Graduate School Of Engineering Kyushu University

関連論文

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• Aqueous Dissolution of Silver Iodide and Associated Iodine Release under Reducing Conditions with FeCl_2 Solution
• Effect of Sodium Nitrate on the Diffusion of Cl− and I− in Compacted Bentonite
• TEN-YEAR INTERACTION OF CARBON STEEL COUPON AND COMPACTED BENTONITES
• Behavior of Fission Products Zirconium and Barium in Fast Reactor Fuel Irradiated to High Burnup
• Corrosion Products from Carbon Steel Formed in Compacted Bentonite under Reducing Conditions
• Initial dissolution rate of a Japanese simulated high-level waste glass P0798 as a function of pH and temperature measured by using micro-channel flow-through test method
• Corrosion Behavior of a Powdered Simulated Nuclear Waste Glass in the Presence of Bentonite.

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