硫酸酸性溶液中におけるクロムの分極ならびにインピーダンス挙動

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  • Polarization and Impedance Behavior of Chromium in Sulfuric Acid Solution
  • リュウサン サンセイ ヨウエキチュウ ニ オケル クロム ノ ブンキョク ナラ

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A polarization behavior of chromium was investigated in H2SO4-Na2SO4 solution of pH 2.0 at 298K by the potentiostatic oxidation and electrode impedance technique. From the coulometry and the chemical analysis of electrolyte the thickness of the passive films on chromium was estimated to be about 2.1nm after 3.6ks potentiostatic oxidation. The frequency response of the electrode impedance were simulated by the equivalent circuit of a cascade connection of two parallel RC in the prepassive (the potential region of the negative loop) and passive region, and of a cascade connection of a parallel RC and a parallel RCL in the active and transpassive region. From the impedance analysis, it was conceivable that the potential drop across the passive film and film/solution interface was constant of about 0.56V irrespective of the polarization potential in the passive region.

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