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| Effect of Pulse Current on Electrochemical Dechlorination |
| Received:April 03, 2024 Revised:April 25, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.05.017 |
| KeyWord:pulse current electrochemical chloride removal hydrogen embrittlement current density concrete corrosion |
| Author | Institution |
| LI Dongyun |
Institute of Metal Research, Chinese Academy of Science, Shenyang , China;College of Materials Science and Engineering, University of Science and Technology of China, Shenyang , China |
| SUN Yupeng |
Institute of Metal Research, Chinese Academy of Science, Shenyang , China;College of Materials Science and Engineering, University of Science and Technology of China, Shenyang , China |
| WANG Changgang |
Institute of Metal Research, Chinese Academy of Science, Shenyang , China |
| CHEN Haonan |
Institute of Metal Research, Chinese Academy of Science, Shenyang , China |
| TANG Junwu |
Naval Logistics Academy, Tianjin , China |
| LI Feng |
China Railway No.3 Engineering Group Co., Ltd., Tianjin , China |
| ZHAO Nan |
Beijing Changping District Rivers and lakes Ecological Environment Service Center, Beijing , China |
| GUO Quanzhong |
Institute of Metal Research, Chinese Academy of Science, Shenyang , China |
| ZHAO Ru |
Naval Logistics Academy, Tianjin , China |
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| Abstract: |
| The work aims to explore the influence of direct current and pulse current on the electrochemical dechlorination of reinforced concrete at different current densities, reduce the hydrogen permeation amount and hydrogen embrittlement risks of steel bars, so as to improve the efficiency of dechlorination and the uniformity of electrochemical dechlorination efficiency. The current densities of 2, 3 and 4A/m2 were selected, and the concrete was electrochemically repaired by direct current and pulse current. The hydrogen release current of the treated steel bar was measured, and the total hydrogen release electricity was calculated to represent the hydrogen permeation amount of the steel bar. The chloride ion content of concrete in the solid current area and weak current area after treatment was compared, and the uniformity of dechlorination efficiency of the two methods was analyzed. At the same time, the microstructure of concrete before and after electrochemical dechlorination was observed by scanning electron microscope. The total hydrogen release amount and chlorine removal efficiency of steel bars with different current densities were calculated. Compared with direct current, the total amount of hydrogen released with pulse current is reduced about 20%, while the chlorine removal efficiency is improved about 10%. The results show that increasing the current density can improve the dechlorination efficiency but increase the risk of hydrogen embrittlement of steel bars. Compared with direct current, the hydrogen permeation of the steel bar is reduced by electrochemical repair with a pulse current, and the dechlorination efficiency in the weak current region is significantly improved. Thus, the uniformity of dechlorination efficiency is improved. |
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