Preparations of MnO₂ Reference Electrodes for Corrosion Monitoring of Reinforced Concrete

Authors

Li YANG, Department of Chemistry,College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China.;
Bing XU, Shanghai Investigation, Design & Research Institute Co., Ltd, Shanghai, 200434, China;
Hai WANG, School of Chemistry and Chemical Engineering, Hubei Key Laboratory of Material Chemistry and Service Failure, Huazhong University of Science and Technology, Wuhan, 430074, China;
Ze-hua DONG, School of Chemistry and Chemical Engineering, Hubei Key Laboratory of Material Chemistry and Service Failure, Huazhong University of Science and Technology, Wuhan, 430074, China;School of Chemical and Food Sciences, Hubei Institute of Arts, Xiangyang 433500, Hubei, China;Follow

Corresponding Author

Ze-hua DONG(zehua.dong@gmail.com)

Abstract

In this work, the solid reference electrode was assemblied by using the electrochemically synthesized manganese dioxide (MnO₂) (EMD) powder, gel electrolyte and thin mortar layer for the durability evaluation of concrete. The EMD reference electrode exhibited higher potential stability (< 10 mV drift) than the chemically synthesied MnO₂ (CMD) based on half year potential tests in the saturated Ca(OH)₂ solution and hardened mortar. In addition, the EMD electrode was almost insensitive to the presences of chloride ion and corrosion inhibitor. Electrochemical impedance and polarization curves indicate that the EMD electrode had lower charge transfer resistance，higher exchange current density and lower temperature coefficient than the CMD electrode. The EMD electrode could be a potential candidate as the long-term reference electrode for the durability management of concrete infrastructure.

Graphical Abstract

Keywords

MnO2, Reference electrode； Concrete；Electrode potential

DOI Link

https://doi.org/10.13208/j.electrochem.160328

Publication Date

2017-02-28

Online Available Date

2016-05-18

Revised Date

2016-04-19

Received Date

2016-03-28

Recommended Citation

Li YANG, Bing XU, Hai WANG, Ze-hua DONG. Preparations of MnO₂ Reference Electrodes for Corrosion Monitoring of Reinforced Concrete[J]. Journal of Electrochemistry, 2017 , 23(1): 36-44.
DOI: 10.13208/j.electrochem.160328
Available at: https://jelectrochem.xmu.edu.cn/journal/vol23/iss1/6