摘要
利用电化学阻抗谱技术研究了N80油套管钢在0.05 mol/L NaHCO3溶液中所成钝化膜的电化学性能,借助于莫特-肖特基曲线分析了成膜电位、测试频率以及Cl-浓度对钝化膜半导体性能的影响.结果表明:钝化膜呈n型半导体特征;随着成膜电位的增加,膜的容抗和施主密度减小;随着Cl-浓度的增加,膜的容抗和施主密度增加,膜的点蚀现象加剧.X射线光电子光谱(XPS)分析结果表明,钝化膜主要由Fe的氧化物Fe2O3和FeO组成.
Electrochemical impedance spectroscopy （EIS） technology was used to explore the semiconductive behaviors of passive film formed on N80 oil tube steel in 0. 5mol/L NaHCO3 solution. On the basis of Mott-Schottky analysis, the effects of measured frequency, film formation potentials and Cl^- concentration on the semiconductive properties of passive film were discussed. The results show that with increasing film formation potentials, the capacitance and donor density of the passive film decrease. The increased Cl^- content increases the capacitance and donor density of the passive film. The addition of Cl^- reduces the donor density and enhances the occurrence of pitting corrosion in the passive film. The X-ray photoelectron spectroscopy （XPS） analysis indicates that the passive film consists primarily of Fe2O3 and FeO.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2006年第11期1325-1328,共4页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金重点资助项目(50231020)
关键词
钝化膜
电化学阻抗谱
莫特-肖特基分析
油套管钢
passive film
electrochemical impedance spectroscopy
Mott-Schottky analysis
oil tube steel
