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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (20): 2347-2352.    下一篇

研究论文

钢筋在再碱化过程中的电化学行为研究

蒋俊1，张俊喜*,1，鲁进亮1，钱胜杰1，邬永成2，王昆3，屈文俊3   

  1. (1上海电力学院 上海高校电厂腐蚀防护与应用电化学重点实验室 上海 200090)
    (2大唐长春第二热电有限责任公司化学分场 长春 130031)
    (3同济大学土木工程学院 上海 200090)
  • 投稿日期:2011-04-27 修回日期:2011-05-30 发布日期:2011-06-16
  • 通讯作者: 张俊喜 E-mail:zhangjunxi@shiep.edu.cn
  • 基金资助:

    国家自然科学基金;国家自然科学基金

Electrochemical Behavior of the Rebar during Re-alkalization Treatment

Jiang Jun1 Zhang Junxi*,1 Lu Jinliang1 Qian Shengjie1 Wu Yongcheng2 Wang Kun3 Qu Wenjun3   

  1. (1 Shanghai University of Electric Power, Shanghai 200090)
    (2 Datang Changchun Second Thermal Power Co. Ltd., Changchun 130031)
    (3 College of Civil Engineering, Tongji University, Shanghai 200090)
  • Received:2011-04-27 Revised:2011-05-30 Published:2011-06-16
  • Contact: Zhang Jun-xi E-mail:zhangjunxi@shiep.edu.cn

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1064

被引次数

5

采用循环伏安方法研究了钢筋在两种常用电解液中再碱化过程中的电化学反应. 考察了钢筋在两种不同溶液中的电极反应, 分析了Li＋离子和Ca2＋离子对电极反应的影响. 并针对上述过程, 实验研究了钢筋电极在两种溶液中电极反应动力学. 结果表明: 由于Li＋离子的存在, 使得钢筋表面的单质铁与不同价态的铁氧化物或氢化合物之间的转化过程与饱和氢氧化钙溶液中转化过程不同|同时也发现, 由于Ca2＋离子的吸附作用, 使得Fe3＋离子的扩散系数低于在氢氧化锂溶液中的扩散系数. 研究结果可为电化学再碱化技术的应用提供理论依据.

关键词: 电极过程, 扩散系数, 再碱化, 碳化混凝土, 钢筋

In this paper, the electrochemical reactions on the rebar during re-alkalization treatment were investigated in two common electrolytes by cyclic voltammetry. According to the electrode reaction of rebar in two different solutions, the influence of Li＋ and Ca2＋ on the electrode reaction was analyzed. Regard to the above process, the reaction kinetics of the rebar electrode in the two solutions was studied by experiment. The results showed that the conversion process between iron of the rebar substrate and different valence of iron oxides or hydroxides was different from that in the saturated calcium hydroxide solution due to the presence of Li＋. Since the adsorption of Ca2＋, the diffusion coefficient of ferric ion was lower than that in Lithium hydroxide. The results could provide theoretical support for the application of the electrochemical re-alkalization technology.

Key words: electrode process, diffusion coefficient, re-alkalization, carbonated concrete, rebar