脉冲电流沉积制备混凝土用<strong>Ag/AgCl</strong>氯离子监测电极

doi:10.11902/1005.4537.2024.365

中国腐蚀与防护学报

2025, Vol. 45

Issue (5): 1399-1407 CSTR: 32134.14.1005.4537.2024.365 DOI: 10.11902/1005.4537.2024.365

研究报告

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脉冲电流沉积制备混凝土用Ag/AgCl氯离子监测电极

冯兴国, 周祺艳, 何奥成, 肖唐, 屈展庆, 卢向雨(

)

河海大学港口海岸与近海工程学院南京 210024

Pulsed Current Electrodeposition Preparation and Performance of Ag/AgCl Electrode as Chloride Ion Monitoring Electrodes for Concrete

FENG Xingguo, ZHOU Qiyan, HE Aocheng, XIAO Tang, QU Zhanqing, LU Xiangyu(

)

College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210024, China

引用本文:

冯兴国, 周祺艳, 何奥成, 肖唐, 屈展庆, 卢向雨. 脉冲电流沉积制备混凝土用Ag/AgCl氯离子监测电极[J]. 中国腐蚀与防护学报, 2025, 45(5): 1399-1407.
Xingguo FENG, Qiyan ZHOU, Aocheng HE, Tang XIAO, Zhanqing QU, Xiangyu LU. Pulsed Current Electrodeposition Preparation and Performance of Ag/AgCl Electrode as Chloride Ion Monitoring Electrodes for Concrete[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1399-1407.

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摘要:

Ag/AgCl电极是监测混凝土中Cl^-浓度的重要元件。为提高Ag/AgCl电极在混凝土环境中寿命，本文采用脉冲电流沉积制备Ag/AgCl电极，分析了电流密度、电沉积时间对混凝土环境中Ag/AgCl电极能斯特响应、抗极化性能、寿命等的影响，并将其与恒电流沉积制备的Ag/AgCl电极进行对照。研究表明相同电流密度和电量条件下，与恒电流沉积Ag/AgCl电极相比，脉冲电流沉积制备的Ag/AgCl电极在相同Cl^-浓度变化时具有更宽的电位响应，更好的抗极化性能和更长寿命。脉冲电流沉积时，随着电流密度增加，制备的Ag/AgCl电极性能有所降低；小电流密度条件下延长沉积时间可提高Ag/AgCl电极性能；综合而言，在0.1 mA/cm²脉冲电流下沉积15 h制备的Ag/AgCl电极性能最佳。此外，观察了电极表面AgCl膜层微观形貌和物相组成，分析了脉冲电流改善Ag/AgCl电极性能的微观机制。

关键词 ： Ag/AgCl电极, 脉冲电流, 恒电流, 混凝土, Cl^-监测

Abstract：

Ag/AgCl electrode is a core component for monitoring chloride ion in concrete. In order to improve the life of Ag/AgCl electrodes, pulsed current electrodeposition was adopted to prepare Ag/AgCl electrodes. The effect of current density and electrodeposition time on the Nernst response, anti-polarization performance, and life of the Ag/AgCl electrodes were investigated in a simulated concrete pore solution. In addition, the properties of the Ag/AgCl electrodes prepared by pulsed current electrodeposition were compared to those of the counterparts produced by constant current. The results show that the former Ag/AgCl electrode has wider potential response, better anti-polarization performance, and longer life than the latter electrode, under the same current density and charge condition. The performance of Ag/AgCl electrodes decreased with the increase of pulsed current density. Under the condition of low pulsed current density, the performance of Ag/AgCl electrode can be improved by extending electrodeposition time. In general, the best performance was observed on the Ag/AgCl electrodes that prepared by electrodeposition at 0.1 mA/cm² pulse current density for 15 h. In addition, the microstructure and the chemical composition of AgCl film on the electrode surface were characterized, and the mechanism of the improvement of performance for the Ag/AgCl electrode by the pulsed current electrodeposition was also analyzed.

Key words： Ag/AgCl electrode pulse current constant current concrete chloride ion monitoring

收稿日期: 2024-11-08 32134.14.1005.4537.2024.365

ZTFLH:

TU511

基金资助:国家重点研发计划(2022YFB3207400)

通讯作者: 卢向雨，E-mail：luxiangyu@hhu.edu.cn，研究方向为金属表面工程，腐蚀与防护

Corresponding author: LU Xiangyu, E-mail: luxiangyu@hhu.edu.cn

作者简介: 冯兴国，男，1983年生，博士，副教授

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.365 或 https://www.jcscp.org/CN/Y2025/V45/I5/1399

图1 恒电流和脉冲电流电沉积过程中电流随时间的变化

表1 电沉积制备Ag/AgCl电极的电流参数

图2 砂浆中Ag/AgCl电极的埋置示意图

图3 不同条件所制备的Ag/AgCl电极在不同Cl-浓度的模拟孔隙液中的电位-浓度图

表2 不同条件所制备的Ag/AgCl电极在不同Cl-浓度模拟孔隙液中的Nernst曲线拟合结果

图4 不同电沉积条件下所制备Ag/AgCl电极在0.05 mol/L Cl-模拟孔隙液中的极化曲线

表3 各种所制备Ag/AgCl电极在0.05 mol/L Cl-孔隙液中交换电流密度

图5 各种所制备Ag/AgCl电极在模拟混凝土孔隙液中电位变化

图6 各种所制备的Ag/AgCl电极在砂浆中的电位变化

图7 各种所制备Ag/AgCl电极的AgCl膜层的表面形貌

图8 不同电沉积条件下所制备Ag/AgCl电极的AgCl膜层截面形貌

图9 不同条件所制备的Ag/AgCl电极表面EDS元素面扫描

表4 各种所制备Ag/AgCl电极表面元素含量 (atomic fraction)

图10 各种所制备Ag/AgCl电极表面的XRD图谱

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