チタンの陽極的不働態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 Halogen Ions on the Anodic Passivation of Titanium
  • チタン ノ ヨウキョクテキ フドウタイ 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 halogen ions on the anodic passivation of titanium in acid, neutral and alkaline solutions has been studied. The results show that: (1) In the presence of F−, severe attack of titanium occurs in an acid solution due to the chemical dissolution of the oxide film by undissociated HF. However, in neutral and alkaline solutions titanium is not attacked. (2) Cl− does not prevent the passivation of titanium due to a very high discharge overvoltage on titanium. (3) Br− discharges from acid and neutral solutions with high overvoltage, giving a pitting corrosion in a neutral solution. (4) I− also shows high overvoltage discharges in acid and neutral solutions but not in an alkaline solution below the discharge potential of OH−. No pitting corrosion occurs by the discharge of I−, since the discharging points tend to spread all-over and to disperse the electrolytic current. The corrosion resistivity of titanium in halogen-bearing solutions is due to its larger affinity with oxygen than with halogen. Therefore, in aqueous solutions the amount of dissolved oxygen, OH− ion, or oxidizing agent has a significant effect on the corrosion resistivity of titanium. No pitting corrosion takes place unless a considerable external electrolytic current is applied, and in the natural environment corrosion is usually prevented.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 23 (3), 185-189, 1959

    公益社団法人 日本金属学会

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