Effect of LiNO_3 on Corrosion Prevention of Aluminum Wastes after Their Land Disposal

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After their land disposal, LiNO3 added to cement solidified miscellaneous wastes inhibits hydrogen gas generation due to alkaline corrosion of aluminum contained in the wastes. We considered the presence of an Li-Al preservation film prevents hydrogen gas generation, and then, we assumed a scenario in which the amount of LiNO3 included in the waste packages is lowered by underground water penetration, resulting in dissolution of the Li-Al preservation film. This dissolution allows the alkaline underground water to reach and corrode the aluminum materials. The loss of Na<SUB>2</SUB>O and K<SUB>2</SUB>O in cement by underground water penetration lowers the pH, so that the aluminum corrosion in the waste packages with LiNO<SUB>3</SUB>, expected when the Li-Al preservation film dissolves, is less than that without LiNO<SUB>3</SUB>.<BR>To test this scenario, we measured solubility of the Li-Al preservation film, L<SUP>+</SUP> ion concentration, pH variation by underground water penetration, and aluminum corrosion when the Li-Al preservation film had dissolved. The measured solubility of the Li-Al preservation film was 3×10<SUP>-4</SUP>M at 283K. At that time, pH was lowered from 12.9- 13.0 to 12.2-12.3. As a result, with LiNO3 addition the aluminum corrosion amount was reduced to 10% of that without LiNO3 addition, because of the pH decrease.

収録刊行物

  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 33(11), p.852-862, 1996-11-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002075821
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • NDL 記事登録ID
    4079955
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A460
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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