Migration behavior of iron ion in compacted bentonite under reducing condition by using electromigration

Kazuya Idemitsu, Seiji Yano, Xiaobin Xia, Yoshiro Kikuchi, Yaohiro Inagaki, Tatsumi Arima

研究成果: Contribution to journalConference article査読

15 被引用数 (Scopus)

抄録

Carbon steel is one of the candidate overpack materials for high-level waste disposal and is expected to assure complete containment of vitrified waste glass during an initial period of 1000 years in Japan. The lifetime of the carbon steel overpack will depend on its corrosion rate. The corrosion rate of carbon steel is reduced by the presence of buffer material such as bentonite, Buffer material will delay the supply of corrosive materials and discharge of corrosion products through it. Carbon steel overpack will be corroded by consuming oxygen introduced by repository construction after closure of repository and then will keep the reducing environment in the vicinity of repository. The reducing condition will be expected to retard the migration of redox-sensitive radionuclides by lowering their solubilities. Therefore, the diffusion of corrosion products of iron in buffer material is important to discuss the corrosion rate of overpack, properties of buffer material and migration of redox-sensitive radionuclides. Electromigration experiments have been carried out with source of iron ions supplied by anode corrosion of iron coupon. Iron ions migrated as fast as 2mm in 2 or 3 hours under electrical field of 100V/m to the direction of cathode. Because the iron ions displaced exchangeable sodium ions in bentonite at a ratio of 1 to 2 during the electromigration, migrating iron ion could be ferrous ion.

本文言語英語
ページ(範囲)657-664
ページ数8
ジャーナルMaterials Research Society Symposium - Proceedings
757
出版ステータス出版済み - 12 8 2003
イベントMATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDING: Scientific Basis for Nuclear Waste Management XXVI - Boston, MA, 米国
継続期間: 12 2 200212 5 2002

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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