成膜电位对X70管线钢在NaHCO<sub>3</sub>溶液中钝化膜电化学性能的影响

中国腐蚀与防护学报

2010, Vol. 30

Issue (3): 241-245

研究报告

本期目录 | 过刊浏览

成膜电位对X70管线钢在NaHCO₃溶液中钝化膜电化学性能的影响

贾志军,李晓刚,梁平,王力伟

北京科技大学新材料技术研究院北京 100083

ELECTROCHEMICAL CHARACTERIZATION OF PASSIVE FILM FORMED UNDER DIFFERENT POTENTIAL CONDITION ON X70 PIPELINE STEEL IN NaHCO₃ SOLUTION

JIA Zhijun, LI Xiaogang, LIANG Ping, WANG Liwei

Advanced Material & Technology Institute, University of Science and Technology Beijing, Beijing 100083

全文: PDF(529 KB)

摘要:

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。

关键词 ： X70管线钢, 钝化膜, 电化学阻抗, Mott-Schottky曲线, 耐蚀性

Abstract：

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.

Key words： X70 pipeline steel passive film EIS Mott-Schottky plot corrosion resistance

收稿日期: 2009-02-16

ZTFLH:

TG172

基金资助:

国家高技术研究发展计划项目（2009AA063405-04）和国家科技基础条件平台建设项目（2005DKA10400）资助

通讯作者: 李晓刚 E-mail: lixiaogang99@263.net

Corresponding author: LI Xiaogang E-mail: lixiaogang99@263.net

作者简介: 贾志军，男，1983生，博士生，研究方向为金属材料的腐蚀与防护

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引用本文:

贾志军,李晓刚,梁平,王力伟. 成膜电位对X70管线钢在NaHCO₃溶液中钝化膜电化学性能的影响[J]. 中国腐蚀与防护学报, 2010, 30(3): 241-245.
GU Zhi-Jun, LIANG Beng, LI Xiao-Gang. ELECTROCHEMICAL CHARACTERIZATION OF PASSIVE FILM FORMED UNDER DIFFERENT POTENTIAL CONDITION ON X70 PIPELINE STEEL IN NaHCO₃ SOLUTION. J Chin Soc Corr Pro, 2010, 30(3): 241-245.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2010/V30/I3/241

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