Impedance Study of Steel Corrosion Induced by Chloride and Sulfate Ions in Simulated Concrete Pore Solution
Corrosion of steel reinforcement induced by chloride and/or sulfate ions was studied using electrochemical methods in the present study.Electrochemical impedance spectroscopy (EIS) was utilised to monitor and interpret the corrosion process.Parameters of passive film in different corrosion phases was obtained via proposed electrochemical equivalent circuit simulation.Results indicated that sulfate ions alone could lead to corrosion initiation and showed higher corrosion risk than chloride as per amount of substance in the simulated concrete pore solution.The coupling presence of chloride and sulfate ions favored higher corrosion rate than that of exposed to chloride or sulfate ions.Nyquist curve, Bode modulus and phase angel format of EIS data revealed more detailed information regarding each process of corrosion.Chi-square method was adopted for verification of fitted results by proposed equivalent circuit.
Steel corrosion Electrochemical analysis Chloride Sulfate
Guojian Liu Rusheng Qian Meng Wu Yunsheng Zhang
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
国际会议
福州
英文
725-730
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）