成膜电位对316L不锈钢在硼酸溶液中电化学行为的影响

doi:10.11902/1005.4537.2014.031

中国腐蚀与防护学报

2015, Vol. 35

Issue (2): 137-143 DOI: 10.11902/1005.4537.2014.031

本期目录 | 过刊浏览

成膜电位对316L不锈钢在硼酸溶液中电化学行为的影响

陈宇, 陈旭(

), 刘彤, 王冠夫, 王彦亮

辽宁石油化工大学石油天然气工程学院抚顺 113001

Effect of Potential on Electrochemical Corrosion Behavior of 316L Stainless Steel in Borate Buffer Solution

CHEN Yu, CHEN Xu(

), LIU Tong, WANG Guanfu, WANG Yanliang

College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

全文: PDF(1640 KB) HTML

摘要:

采用动电位极化和电化学阻抗方法研究了316L不锈钢在硼酸溶液中钝化膜的电化学性能,并通过Mott-Schottky曲线考察了不同成膜电位下钝化膜的半导体性质。结果表明,316L不锈钢在-0.1~0.5 V发生了明显的钝化现象,在0.3 V成膜电位下形成的钝化膜更加致密和稳定。Mott-Schottky曲线结果表明,成膜电位对于316L不锈钢钝化膜的半导体特征性质没有根本影响,在钝化区间内钝化膜呈p型半导体特征,在0.3 V时受主密度最小。

关键词 ： 316L不锈钢, 成膜电位, 动电位极化, 电化学阻抗, Mott-Schottky曲线

Abstract：

The electrochemical corrosion behavior of passive film of 316L stainless steel in borate buffer solution was investigated by dynamic polarization and electrochemical impedance spectroscopy (EIS) technology. The semiconducting character of the passive film was studied by Mott-Schottky curve. The results showed that a much compact and stable passive film could form on 316L stainless steel surface by potentials in a range from -0.1 to 0.5 V; the applied potential had little effect on the semiconducting character of the formed passive film. The passive films formed by potentials in the above range exhibited character of p-type semiconductor and among them the one formed by 0.3 V had the lowest acceptor density N_A.

Key words： 316L stainless steel film forming potential dynamic polarization EIS Mott-Schottky

收稿日期: 2014-04-22

ZTFLH:

TG174

基金资助:国家自然科学基金项目(51201009)和辽宁省自然科学基金项目（2013020078）资助

作者简介: null

陈宇，男，1986年生，硕士生

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引用本文:

陈宇, 陈旭, 刘彤, 王冠夫, 王彦亮. 成膜电位对316L不锈钢在硼酸溶液中电化学行为的影响[J]. 中国腐蚀与防护学报, 2015, 35(2): 137-143.
Yu CHEN, Xu CHEN, Tong LIU, Guanfu WANG, Yanliang WANG. Effect of Potential on Electrochemical Corrosion Behavior of 316L Stainless Steel in Borate Buffer Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 137-143.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.031 或 https://www.jcscp.org/CN/Y2015/V35/I2/137

图1 316L不锈钢侵蚀后不同放大倍数下的金相组织

图2 316L不锈钢在硼酸溶液中的极化曲线

图3 316L不锈钢在硼酸溶液中不同成膜电位下的极化曲线

图4 316L不锈钢在硼酸溶液的Nyquist图

图5 316L不锈钢在硼酸溶液中的Bode图

图6 等效模拟电路

表1 EIS等效电路拟合结果

图7 316L不锈钢在不同成膜电位下钝化膜的Mott-Schottky曲线

图8 成膜电位与受主密度和平带电位的关系

图9 空间电荷层厚度与成膜电位的关系曲线

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