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采用恒电流法电化学除氯处理受氯离子污染的钢筋混凝土试样,并用pH/Cl-复合探针原位检测电化学除氯过程钢筋混凝土不同位置孔隙液的氯离子含量与pH值分布,同时用线性极化曲线和交流阻抗谱图等电化学技术考察钢筋的腐蚀性能,探讨电化学除氯过程的混凝土微环境和钢筋腐蚀速率.研究结果表明:在电化学除氯过程,混凝土孔隙液的氯离子浓度逐降,而pH值在初期略有升高,随之其pH值略降;电化学除氯施加的阴极电流,使钢筋处于阴极极化状态而得到保护;除氯停止(即退极化)后钢筋的腐蚀电位明显正移,腐蚀电流降低,极化电阻升高,表明电化学除氯能改善钢筋的腐蚀环境,降低钢筋的腐蚀速率.
The chloride ion concentration and pH value distribution in different positions of reinforced concrete in electrochemical dechlorination process were detected by pH / Cl-composite probe in situ using the galvanostatic electrochemical dechlorination treatment of reinforced concrete samples contaminated by chloride ions. At the same time, the electrochemical corrosion resistance of steel bar was investigated by using electrochemical techniques such as linear polarization curve and AC impedance spectroscopy, and the corrosion rate and corrosion resistance of reinforced concrete under electrochemical dechlorination process were discussed.The results showed that in the process of electrochemical dechlorination, Of the chloride ion concentration decreased, while the pH value slightly increased in the initial stage, along with its slightly lower pH; electrochemical chloride removal of the cathode current, the steel in the cathodic polarization state to be protected; chlorine to stop After the depolarization, the corrosion potentials of the reinforcing bars are obviously positive, the corrosion current is reduced, and the polarization resistance is increased, indicating that the electrochemical dechlorination can improve the corrosion environment of the reinforcing bars and reduce the corrosion rate of the reinforcing bars.