应变对混凝土孔隙液中不锈钢钝化性能影响的电化学研究

doi:10.11902/1005.4537.2014.128

中国腐蚀与防护学报

2015, Vol. 35

Issue (4): 372-378 DOI: 10.11902/1005.4537.2014.128

本期目录 | 过刊浏览

应变对混凝土孔隙液中不锈钢钝化性能影响的电化学研究

冯兴国¹,卢向雨²,左禹³,陈达¹(

)

2. 江苏科技大学材料科学与工程学院镇江 212003
3. 北京化工大学材料科学与工程学院北京 100029

Effect of Strain on Passivation of Stainless Steel in a Simulated Concrete Pore Solution

Xingguo FENG¹,Xiangyu LU²,Yu ZUO³,Da CHEN¹(

)

1. Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing 210098, China
2. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
3. School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China

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摘要:

通过开路电位、电化学阻抗、Mott-Schottk等电化学方法研究了不同形变量的不锈钢在模拟混凝土孔隙液中的钝化性能。结果表明,随着形变量的增加,不锈钢的开路电位和阻抗值都逐渐降低,其钝化膜中氧空位浓度明显升高。随着形变量的增加,不锈钢的钝化性能有所降低。不同形变量的不锈钢的钝化性能之间的差异不会随着其在孔隙液中浸泡时间的延长而减小。

关键词 ：不锈钢, 混凝土孔隙液, 钝化, Mott-Schottky

Abstract：

Passivation behavior of a deformed stainless steel in a simulated concrete pore solution was studied by means of open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and Mott-Schottky plots. The results show that with the increasing strain, the OCP and impedance of the steel decreased, whereas the concentration of oxygen vacancy in passive films increased. This result suggests that the passivation of the stainless steel is degraded by the increasing strain. In addition, the difference in passivation between the deformed samples would not be diminished with the increasing immersion time.

Key words： stainless steel concrete pore solution passivity Mott-Schottky

基金资助:国家自然科学基金项目 (51301060),高等学校学科创新引智计划项目 (B12032),水利部公益性行业科研专项经费项目(201301052) 和中央高校基本科研业务费专项项目 (2013B03514) 资助

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引用本文:

冯兴国,卢向雨,左禹,陈达. 应变对混凝土孔隙液中不锈钢钝化性能影响的电化学研究[J]. 中国腐蚀与防护学报, 2015, 35(4): 372-378.
Xingguo FENG, Xiangyu LU, Yu ZUO, Da CHEN. Effect of Strain on Passivation of Stainless Steel in a Simulated Concrete Pore Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 372-378.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.128 或 https://www.jcscp.org/CN/Y2015/V35/I4/372

图1 不锈钢试样的尺寸

图2 不同形变量下不锈钢试样在混凝土孔隙液中的开路电位

图3 不同形变量试样在孔隙液中浸泡不同时间的Nyquist图

图4 不同形变量试样在孔隙液中浸泡不同时间的Bode图

图5 拟合所用的等效电路

表1 不同形变量的不锈钢在孔隙液中等效电路各元件拟合值

图6 形变量对模拟孔隙液中不锈钢钢筋极化电阻和双电层电容的影响

图7 不同形变量不锈钢试样在孔隙液中浸泡2 h后的Mott-Schottky曲线

图8 形变量对不锈钢钝化膜中空位浓度的影响

图9 形变量对不锈钢双电层厚度的影响

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