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中国腐蚀与防护学报  2025, Vol. 45 Issue (3): 773-779     CSTR: 32134.14.1005.4537.2024.208      DOI: 10.11902/1005.4537.2024.208
  研究报告 本期目录 | 过刊浏览 |
几种混凝土用固态参比电极的综合性能对比研究
何奥成1, 周祺艳1, 肖唐1, 屈展庆1, 卢向雨1, 陈松贵2, 冯兴国1()
1.河海大学港口海岸与近海工程学院 南京 210024
2.交通运输部天津水运工程科学研究院 天津 300456
Comparison of Comprehensive Properties of Several Solid-state Reference Electrodes for Concrete
HE Aocheng1, ZHOU Qiyan1, XIAO Tang1, QU Zhanqing1, LU Xiangyu1, CHEN Songgui2, FENG Xingguo1()
1.College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210024, China
2.Tianjin Research Institute for Water Transport Engineering, M. O. T., Tianjin 300456, China
引用本文:

何奥成, 周祺艳, 肖唐, 屈展庆, 卢向雨, 陈松贵, 冯兴国. 几种混凝土用固态参比电极的综合性能对比研究[J]. 中国腐蚀与防护学报, 2025, 45(3): 773-779.
Aocheng HE, Qiyan ZHOU, Tang XIAO, Zhanqing QU, Xiangyu LU, Songgui CHEN, Xingguo FENG. Comparison of Comprehensive Properties of Several Solid-state Reference Electrodes for Concrete[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 773-779.

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摘要: 

固态参比电极被广泛用于监测钢筋腐蚀和混凝土中Cl-浓度,是监测混凝土结构耐久性的核心元件之一。目前,固态参比电极在混凝土环境中难以满足参比电极的各项性能要求,遴选综合性能良好的固态参比电极至关重要。本文分别在模拟孔隙液和砂浆中对比了粉体MnO2参比电极、胶体MnO2参比电极、镍铁氧体(NiFe2O4)固态参比电极和石墨电极的重现性、稳定性,以及各参比电极对温度、pH、氧浓度和Cl-浓度的敏感性,综合分析了不同固态参比电极的性能。结果表明粉体MnO2电极重现性、稳定性较好,对Cl-不敏感;胶体MnO2电极对pH不敏感;NiFe2O4固态参比电极对温度、氧含量不敏感。综合而言,在模拟混凝土孔隙液中,粉体MnO2参比电极的综合性能最佳;在砂浆体系的短期试验中,粉体MnO2电极、胶体MnO2电极、NiFe2O4电极性能相差较小,几种电极的长期性能仍有待进一步验证。

关键词 固体参比电极混凝土MnO2电极NiFe2O4固态参比电极综合性能    
Abstract

Solid-state reference electrodes were widely adopted to monitor the corrosion of reinforcement and chloride ion concentration in concrete protective layers, which is one of the core components of the durability monitoring equipment for concrete structures. In present, the existing electrodes cannot satisfy all the application requirements of solid-state reference electrodes in concrete environments. Thus, it is important to select solid-state reference electrodes with favorable comprehensive performance. In this article, the repeatability and stability of powder MnO2 reference electrode, colloidal MnO2 reference electrode, nickel ferrite (NiFe2O4) solid reference electrode, and graphite electrode were compared in simulated pore solution and mortar, respectively. The sensitivities of these reference electrodes also were compared when they were used in multiple operating conditions, such as different temperatures, pH values, oxygen concentrations, and chloride ion concentrations etc. The comprehensive properties of various solid-state reference electrodes were analyzed by weighing method. The results show that the powder MnO2 electrode has favorable reproducibility and stability, but it was not sensitive to the pH value in the concrete environment. In comparison, the NiFe2O4 solid-state reference electrode was insensitive to temperature and oxygen content. In summary, the powder MnO2 reference electrode displayed the best comprehensive properties in the simulated pore solution. For the short-term testing in mortar, slight differences were observed in the properties of the powder MnO2 electrode, colloidal MnO2 electrode, and nickel ferrite electrode, and further research needs to be performed on the long-term performance of the three electrodes in concrete environments.

Key wordssolid-state reference electrodes    concrete    MnO2 electrode    NiFe2O4 solid-state reference electrode    comprehensive properties
收稿日期: 2024-07-01      32134.14.1005.4537.2024.208
ZTFLH:  TU511  
基金资助:国家重点研发计划(2022YFB3207400);中央高校科研业务费专项(TKS20220601)
通讯作者: 冯兴国,E-mail:fengxingguo@hhu.edu.cn,研究方向为结构耐久性、水工新材料
Corresponding author: FENG Xingguo, E-mail: fengxingguo@hhu.edu.cn
作者简介: 何奥成,男,2001年生,硕士生
图1  混凝土用固态参比电极结构图
图2  参比电极实物图
图3  饱和Ca(OH)2溶液中各固态参比电极的电位演变
图4  4种固态参比电极的电极电位的重现性
图5  4种固态参比电极的电极电位随环境温度变化
图6  4种固态参比电极在不同pH的孔隙液中的电极电位
图7  4种固态参比电极在不同氧含量的模拟混凝土孔隙液中的电极电位
图8  4种固态参比电极在不同Cl-浓度的模拟混凝土孔隙液中的电极电位

Type of

electrode

StabilizationReproducibilitySensitivity on temperatureSensitivity on pHSensitivity on oxygen concentrationSensitivity on chloride ion contentComprehensive performance
Powder MnO2++++++++++++++++++++++++
Colloidal MnO2+++++++++++++++++++++
NiFe2O4++++++++++++++++++++++
Graphite++++++++++++++++
表1  4种固态参比电极综合性能比较
图9  4种固态参比电极在混凝土中的电位-时间曲线
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