Steel Corrosion Resistance after Electrochemical Chloride Extraction Using Electrochemical Impedance Spectroscopy
Chloride-induced corrosion is one of the major causes of deterioration of reinforced concrete structures.An electrochemical chloride extraction method can be applied to remove the chloride in concrete.In this study, by adopting an electrochemical impedance spectroscopy method, the influences of treatment time and current density on the steel corrosion state before and after desalination were investigated.The results indicate that after electrochemical desalination for 4 weeks or 8 weeks, the low frequency region in Nyquist plots presents a significant impedance modulus improvement and a significant increase in the mortar interface region resistance with the extension of treatment time.Moreover, the arc radius in the high frequency section and the corresponding passive film resistance Rf increase with treatment time.The steel corrosion current decreases and the corrosion rate slows down with a prolonged desalination time.Electrochemical desalination with high current density is beneficial for the re-passivation of steel, and the steel corrosion current decreases with the increase of applied current density.
steel corrosion electrochemical chloride extraction electrochemical impedance spectroscopy
Hongqiang Chu Bangqing Zhang Sujing Zhao Ming-zhi Guo Zheng Cui Linhua Jiang Zijian Song
College of Mechanics and Materials, Hohai University, Nanjing 210098, China
国际会议
福州
英文
707-714
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）