ジルコニウムの陽極的不働態化に及ぼすハロゲンイオンの影響

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タイトル別名
  • The Effect of Halide Ions on the Anodic Passivation of Zirconium
  • ジルコニウム ノ ヨウキョクテキ フドウタイカ ニ オヨボス ハロゲンイオン ノ エイキョウ

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抄録

The effect of halide ions on the anodic passivation of zirconium in acid, neutral and alkaline solutions was studied. In the presence of F− ions, dissolution of zirconium was observed in acid solution and pitting corrosion in neutral solution, but in alkaline solution zirconium was not attacked. In the presence of Cl− or Br− ion, pitting corrosion of zirconium was observed in solutions of any pH value, but pitting by Cl− ion and that by Br− ion was prevented comparatively by presence of NO3− or NO2− ion and OH− ion, respectively. Neutral iodide solution, without other oxyanions, can pit zirconium, but the solution containing other oxyanion caused no pitting. Oxidizing agents promote the start of pitting, but general anions (e.g. SO4=, SO3=, NO3−, NO2−, OH−) prevent corrosive action of halide ions. The pitting corrosion potential, 0.20∼0.23 V (vs. S.C.E) for Cl− 0.1 mol/L, 0.45∼0.50 V for Br−, and 0.82∼0.86 V for I−, did not vary with current density. A linear relation exists between the pitting corrosion potential and the logarithm of the halide ion concentration. Halide ions cause a greater number of smaller pits in the order of Cl−<Br−<I−.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 24 (10), 680-684, 1960

    公益社団法人 日本金属学会

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