利用电容测试法和光电流技术研究了X80管线钢在NaHCO3/ Na2CO3缓冲溶液中所成钝化膜的半导体 性能和光电流特性,分析了成膜电位、成膜时间、Cl-浓度、溶液pH值以及成膜温度等因素对膜光电流响应的影响. 结果表明,X80管线钢钝化膜的Mott-Schottky直线部分的斜率和光电流均为正,表明钝化膜呈现n 型半导体特性.随着成膜电位的增加、成膜时间延长、溶液pH值升高、成膜温度及溶液中Cl-浓度的减小,Mott-Schottky直线部分的斜率和光电流响应均呈增大趋势,表明钝化膜内施主密度减小.
The semi-conductive property and photo-electrochemical characterization of passive film formed on X80 pipeline steel in bicarbonate/carbonate buffer solution. The factors, which affect the photo-electrochemical response of the passive film, were analyzed. The results showed that the slope of Mott-Schottky plot and the photocurrent were positive, indicating an n-type semi-conductive property of the passive film. With increment the formation potential, prolonging the formation time, decreasing the pH value of the solution，formation temperature and chloride ions concentration, the photocurrent appeared an increasing tendency, it showed that donor density of the passive film decreased.
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