| Change of Electrochemical Property of Reinforced Concrete after Electrochemical Chloride Extraction |
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| 作者姓名： | WANG Xinxiang YU Qijun DENG Chunlin WEI Jiangxiong WEN Ziyun |
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| 作者单位： | [1]Key Laboratory of Specially Functional Materials of the Ministry of Education, South China University of Technology, Guangzhou 510640, China [2]Guangdong Academy of Construction and Architecture Science, Guangzhou 510500, China |
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| 摘 要： | The half cell potential （HCP） and corrosion current of reinforced concrete specimens doped with sodium chloride were determined after electrochemical chloride extraction （ECE）. The experimental results show that when ECE treatment is removed, HCP becomes more negative and corrosion current becomes larger in comparison to those before ECE treatment, then HCP shifts positively and corrosion current decreases with time. After 30 days ECE treatment, the HCP of cored specimens turn to about -100 mV due to the existence of sufficient oxygen around the exposed steel bars, but for un-cored specimens, longer time, about two months, is to be taken. The non-homogeneous HCP distribution at different layers of the same specimen after ECE treatment might induce secondary corrosion of steels.
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| 关 键 词： | 钢筋混凝土 腐蚀性 电气化学 氧化作用 |
| 收稿时间： | 2006-09-20 |
| 修稿时间： | 2007-05-28 |
Change of electrochemical property of reinforced concrete after electrochemical chloride extraction |
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| WANG Xinxiang YU Qijun DENG Chunlin WEI Jiangxiong WEN Ziyun.Change of Electrochemical Property of Reinforced Concrete after Electrochemical Chloride Extraction[J].Journal of Wuhan University of Technology. Materials Science Edition,2007,22(4):764-769. |
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| Authors: | Wang Xinxiang Yu Qijun Deng Chunlin Wei Jiangxiong Wen Ziyun |
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| Affiliation: | (1) Key Laboratory of Specially Functional Materials of the Ministry of Education, South China University of Technology, Guangzhou, 510640, China;(2) Guangdong Academy of Construction and Architecture Science, Guangzhou, 510500, China |
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| Abstract: | The half cell potential(HCP)and corrosion current of reinforced concrete specimens doped with sodium chloride were determined after electrochemical chloride extraction(ECE).The experimental results show that when ECE treatment is removed,HCP becomes more negative and corrosion current becomes larger in comparison to those before ECE treatment,then HCP shifts positively and corrosion current decreases with time.After 30 days ECE treatment,the HCP of cored specimens turn to about -100 mV due to the existence of sufficient oxygen around the exposed steel bars,but for un-cored specimens,longer time,about two months, is to be taken.The non-homogeneous HCP distribution at different layers of the same specimen after ECE treatment might induce secondary corrosion of steels. |
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| Keywords: | reinforced concrete corrosion electrochemical chloride extraction half-cell potential corrosion current |
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