希HCl水溶液中におけるチタンの水素吸収に対する溶存酸素の抑制効果

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  • The Effect of Dissolved Oxygen on Prevention of Hydrogen Absorption of Titanium in Dilute HCl Solutions
  • キ HCl スイヨウエキチュウ ニ オケル チタン ノ スイソ キュウシュウ

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The region of passive/active state of pure titanium in aerated and deaerated dilute HCl solutions was determined and hydrogen absorption of titanium in the passive region was investigated.<br>The results obtained are as follows.<br>(1) The passive region of titanium was wider in the aerated HCl solutions than in the deaerated solutions.<br>(2) In the aerated HCl solutions, titanium scarcely absorbed hydrogen at the whole temperature range of 70°C to 250°C.<br>(3) In the deaerated HCl solutions, hydrogen absorption of titanium increased with increasing acidity and temperature of solution but did not increase over 200°C.<br>(4) The passive film on titanium was formed more thickly in the aerated HCl solutions than in the deaerated solutions. In the deaerated HCl solutions, passive film formed on titanium became thicker over 200°C. The passive film was consisted of various titanium oxides such as TiO, Ti2O3, and TiO2. TiO2 content in the film increased with increasing temperature.<br>(5) The results of calculation of hydrogen atoms produced on titanium surface from the cathodic polarization curves of titanium indicated that hydrogen atoms decreased with increasing temperature in the aerated HCl solutions. On the other hand, in the deaerated HCl solutions, hydrogen atoms increased with increasing temperature, but hydrogen absorption efficiency decreased at 200°C. These results corresponded that the passive film on titanium which acted the barrier of hydrogen absorption was formed thickly at this temperature.

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