用于原位检测在深海并压力交变环境中有机涂层电化学阻抗的预埋微电极研究

doi:10.11902/1005.4537.2016.197

中国腐蚀与防护学报

2017, Vol. 37

Issue (6): 561-566 DOI: 10.11902/1005.4537.2016.197

研究报告

本期目录 | 过刊浏览

用于原位检测在深海并压力交变环境中有机涂层电化学阻抗的预埋微电极研究

孟凡帝¹, 刘莉¹(

), 李瑛¹, 王福会^1,²

1 中国科学院金属研究所沈阳 110016
2 东北大学沈阳材料科学国家研究中心腐蚀与防护部沈阳 110819

Embedded Microelectrode for In situ Electrochemical Impedance Spectroscopy Measurement of Organic Coating Under Marine Alternating Hydrostatic Pressure

Fandi MENG¹, Li LIU¹(

), Ying LI¹, Fuhui WANG^1,²

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 Corrosion and Protection Division, Shenyang National Laboratory for Materials Science, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

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摘要:

实验设计了一种预先植入涂层内部的圆环状微电极,并基于预埋微电极的方法设计了适用于深海交变压力环境下有机涂层原位电化学阻抗测试的电极系统。结果表明：设计的预埋微电极有效避免了外置电极在使用过程中不易安装以及有机涂层本身厚度对电化学测试信号的影响等缺点,实现了原位的涂层服役性能评价。同时,该微电极可以在深海高压及交变压力环境下有效使用,测试结果与传统三电极测量装置具有较好的一致性,证明了微电极设计的有效性及可靠性。

关键词 ：预埋微电极, 电化学阻抗谱, 交变压力, 环氧涂层

Abstract：

A kind of circular loop microelectrode was designed and embedded in the coating body during coating fabrication. Then a novel electrochemical impedance spectroscopy (EIS) measurement system was developed based on the embedded-microelectrode (EM), which was suitable for in situ evaluation of the coating in alternating hydrostatic pressured (AHP) sea-water with the purpose of simulation of deep sea environments. The results showed that EM could avoid difficulties related with the installation of an external electrode and could overcome drawbacks that the detected signals of the corrosion of metal beneath thick coatings was too weak for the field measurement by an external electrode. Therefore, the EM can be utilized in high hydrostatic pressured or AHP sea-water environment. The EIS results of the EM system were consistent well with those of the traditional three-electrode measuring device. Consequently, the validity and reliability of EM were reasonably confirmed.

Key words： embedded-microelectrode electrochemical impedance spectroscopy alternating hydrostatic pressure organic coating

收稿日期: 2016-10-09

ZTFLH:

TG174.4

基金资助:中国科学院海洋环境腐蚀与生物污损重点实验室开放课题资助

作者简介:

作者简介孟凡帝,男,1988年,博士生

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引用本文:

孟凡帝, 刘莉, 李瑛, 王福会. 用于原位检测在深海并压力交变环境中有机涂层电化学阻抗的预埋微电极研究[J]. 中国腐蚀与防护学报, 2017, 37(6): 561-566.
Fandi MENG, Li LIU, Ying LI, Fuhui WANG. Embedded Microelectrode for In situ Electrochemical Impedance Spectroscopy Measurement of Organic Coating Under Marine Alternating Hydrostatic Pressure. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 561-566.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.197 或 https://www.jcscp.org/CN/Y2017/V37/I6/561

图1 装有预埋微电极的涂层/金属电极试样示意图

图2 适用于电化学阻抗测试的双微电极装置示意图

图3 通过传统测量方式与双微电极试样测试的浸泡不同时间涂层的EIS

表1 常规的及预埋微电极的涂层/金属电极试样在浸泡不同时间后所测得的低频阻抗模值|Z |0.01 Hz

表2 浸泡不同时间后采用两种测量方式获得的涂层的低频阻抗模值|Z |0.01 Hz

图4 不同幅值交变压力加速实验下微电极装置测得的涂层阻抗模值变化

图5 不同幅值交变压力加速实验240 h后金属基体的宏观表面形貌

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