采用动电位极化、电化学阻抗和电容测量等方法研究了X70管线钢在 0.5 mol?L-1 NaHCO3溶液中的电化学行为及生成钝化膜的电化学性能。极化曲线结果表明，X70钢在该溶液中有着明显的钝化行为；电化学阻抗表明，随着成膜电位正移，X70钢表面形成的钝化膜更加致密，均匀性更好；电容测量表明，X70钢在不同成膜电位下形成的钝化膜在 -0.20~0.80 V扫描范围内为n型半导体，并且随着成膜电位的正移，空间电荷层更厚，施主密度逐渐减小，耐蚀性更好。
The passive behavior and electrochemical characterization of passive film formed under different potential on X70 pipeline steel in NaHCO3 solution were discussed by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and capacitance measurements. It is shown that the X70 pipeline steel has a wide passive anodic region between -50 mV to 900 mV. EIS result indicates that the passive film is much denser and uniform with the increasing potential. Mott-Schottky analysis presents that the passive films on X70 pipeline steel in 0.5 mol?L-1 NaHCO3 solution exhibits n-type semiconductive character in potential region of -0.2 V to 0.8 V. The donor density of the passive film decreases and the thickness of the space-charge layers increases with the increasing potential. The corrosion resistance of the passive film increases with the forming potential.
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