亜鉛電解採取における電析亜鉛の再溶解挙動に及ぼす不純物の相乗作用 Synergistic Effect of Impurities on the Dissolution Behavior of Zn Electrodeposited from Electrowinning Solutions

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The synergistic effect of impurities on the dissolution behavior of Zn electrodeposited from the electrowinning solutions containing a different combination of impurities has been investigated by measuring the time-dependence of cathode potential during electrolysis and the polarization curves in the solutions. The impurities are classified into four groups ; group I (Ag, Cu, Cd) which changes inherent hydrogen overpotential <I>η</I><SUP>0</SUP><SUB>H</SUB> by depositing at limiting current density; group II (Ni, Co, Fe) which reduces <I>η</I><SUP>0</SUP><SUB>H</SUB> by partially depositing at lower current densities than limiting one ; group III (As, Sb, Ge) which catalytically reduces <I>η</I><SUP>0</SUP><SUB>H</SUB> ; and group IV (Al, Pb) which causes no change in <I>η</I><SUP>0</SUP><SUB>H</SUB>. In the solution containing both iron-group metal of group II and Cu of group I or Sb of group III as impurity, the dissolution of deposited Zn was more likely to occur than in the solution containing each impurity alone. Cu and Sb increase the kinetically suppressed deposition rate of iron-group metals, resulting in the increase in the critical current density for Zn deposition. The occurrence of dissolution of deposited Zn was closely related to the increase in critical current density for Zn deposition. Although the cycle of deposition and dissolution of Zn was repeated in the solution containing iron-group metal alone, no Zn deposited again after the dissolution occurred in the solution containing iron-group metal and Cu or Sb. This is ascribed to cathode surface replaced by Cu and iron-group metal during dissolution of Zn.

収録刊行物

  • Journal of MMIJ : journal of the Mining and Materials Processing Institute of Japan  

    Journal of MMIJ : journal of the Mining and Materials Processing Institute of Japan 124(3), 179-183, 2008-03-25 

    The Mining and Materials Processing Institute of Japan

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各種コード

  • NII論文ID(NAID)
    10021121383
  • NII書誌ID(NCID)
    AA12188381
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    18816118
  • NDL 記事登録ID
    9440812
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-315
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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