首页|基于电化学阻抗和电阻传感器对比研究铜的大气腐蚀

基于电化学阻抗和电阻传感器对比研究铜的大气腐蚀

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开发电化学阻抗和薄膜电阻传感器,用于干湿/高低温循环加速试验和现场暴露试验中铜的大气腐蚀测量.三个月的场外暴露试验结果表明,电阻传感器测量的铜平均腐蚀速率与失重法得到的腐蚀速率基本一致.在干湿循环试验中,电化学阻抗传感器可灵敏地反映传感器表面的潮湿/干燥时间.尽管电化学阻抗传感器测得的平均腐蚀速率与电阻传感器测得的腐蚀速率具有相似的趋势,但前者测量结果对环境湿度的依赖性较后者大.当相对湿度低于60％时,通过电化学阻抗法得到的平均腐蚀速率远低于失重法的,这主要归因于低湿度条件下梳齿铜电极之间无法形成连续导电的薄液膜通道,导致电化学阻抗传感器无法检测到电流信号.与电化学方法相比,电阻法更适合大气腐蚀监测,因为无论电阻传感器表面潮湿或者干燥,它都能根据欧姆定律灵敏地监测铜箔的厚度损失.
Comparative investigation on copper atmospheric corrosion by electrochemical impedance and electrical resistance sensors
Electrochemical impedance (EIS) and thin electrical resistance (ER) sensors were invented for atmospheric corrosion measurement of copper (Cu) during cyclic wetting-drying/high-low temperature tests and field exposure tests. Three-month field exposure results showed that average corrosion rate of Cu measured by ER sensor was well in accordance with that by weight loss method. During cyclic wetting-drying test, EIS was proven to reflect sensitively time of wetting and drying on the surface of sensor. Although corrosion rate obtained from EIS had a similar tendency to that obtained from ER sensors, the former was more dependent on environmental humidity than the latter. When relative humidity was low than 60％, corrosion rate of Cu measured by EIS was much lower than that by weight loss method, mainly attributing to the fact that impedance sensor failed to detect corrosion current of interlaced Cu electrodes due to the breakdown of conductive passage composed of absorbed thin liquid film under low humidity condition. Promisingly, ER sensor was proven to be more suitable for atmospheric corrosion monitoring than electrochemical techniques because it could sensitively monitor thickness loss of Cu foil according to the Ohmic law, no matter how dry or wet the sensor surface is.

atmospheric corrosioncopperelectrical resistance probeelectrochemical impedancein-situ corrosion monitoring

万闪、廖伯凯、董泽华、郭兴蓬

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广州大学化学化工学院,广州 510006

华中科技大学化学与化工学院湖北省材料化学与服役失效重点实验室,武汉 430074

大气腐蚀 铜 电阻探针 电化学阻抗 原位腐蚀监测

National Natural Science Foundation of ChinaChina Postdoctoral Science Foundation

517710792020M682650

2021

10.1016/S1003-6326(21)65712-6

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(10)
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