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用动电位伏安法和XPS等研究钛在磷酸介质中形成的阳极钝化膜的还原;用暗态下铁氰电对在钛阳极钝化膜上的反应动力学研究膜的导电特性。结果表明:1)膜的还原程度视阴极极化条件而异,还原过程由传荷步骤(H~++eH)和化学转化步骤(TiO_2+H→TiOOH,TiOOH+H→TiO+H_2O等)构成,而且后者是速度控制步骤.2)在电位1～8V内形成的钛钝化膜均具有n-型半导电特性,“掺杂”浓度随钛阳极钝化膜增厚而减小。
The reduction of anode passivation film formed by titanium in phosphoric acid medium was studied by potentiodynamic voltammetry and XPS. The conductivity of the film was investigated by the reaction kinetics of ferricyanide on the passivation film of titanium anode in dark state. The results show that: 1) The degree of film reduction varies with cathodic polarization conditions. The reduction process consists of a charge-transfer step (H ~ + + eH) and chemical conversion steps (TiO 2 + H → TiOOH, TiOOH + H → TiO + , And the latter is the speed control step.2) The titanium passivation films formed at the potential of 1 ~ 8V all have n-type semiconducting characteristics, and the “doping” concentration decreases with the increase of the thickness of the titanium anode passivation film.