Corrosion of Steel in Simulated Concrete Pore Solution and Equivalent Circuits Selection
LIU Guojian1,*, ZHANG Yunsheng2, LIU Cheng2, WU Meng2, PANG Bo2
1 School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China 2 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Abstract: Kramers-Kronig transform was applied to verify electrochemical impedance spectroscopy (EIS) data of steel corrosion in simulated concrete pore solution. The basic principles to determine optimal equivalent circuit for interpretation of EIS data were established based on qualitative and quantitative discussions. Results showed that EIS data in present study conform to linearity, causality and stability. Through visual inspection, Chi-square method and key simulated parameters evolution check, the equivalent circuit of R(Q(R(QR))) proved to be optimal to simulate the EIS data of corrosion process in simulated pore solution. Additionally, Chi-square value was suggested to be within the range of 10-4 order of magnitude.
1 Hou B, Li X, Ma X, et al. NPJ Materials Degradation,2017,1(1),4. 2 Ke W. China corrosion investigation report, Chemical Industry Press, China,2003(in Chinese). 柯伟.中国腐蚀调查报告, 化学工业出版社,2003. 3 Epelboin I, Keddam M, Takenouti H. Journal of Applied Electrochemistry,1972,2(1),71. 4 Zhang J Q, Cao C N. Journal of Chinese Society for Corrosion and Protection,1991,11(2),105(in Chinese). 张鉴清, 曹楚南.中国腐蚀与防护学报,1991,11(2),105. 5 Liu G, Zhang Y, Ni Z, et al. Construction and Building Materials,2016,115,1. 6 Qiao H X, Wen S Y, Wang P H, et al. Journal of Building Materials,2019,22(6),999(in Chinese). 乔宏霞, 温少勇, 王鹏辉, 等.建筑材料学报,2019,22(6),999. 7 Shi J J, Sun W. Journal of the Chinese Ceramic Society,2010,38(9),155(in Chinese). 施锦杰, 孙伟.硅酸盐学报,2010,38(9),155. 8 He H Z, Fan L C. Journal of Tongji University (Natural Science),2005,33(1),33(in Chinese). 贺鸿珠, 范立础.同济大学学报(自然科学版),2005,33(1),33. 9 Shi M, Chen Z, Sun J. Cement and Concrete Research,1999,29,1685. 10 Boukamp B. Journal of the Electrochemical Society,1995,142(6),1885. 11 Schönleber M, Klotz D, Ivers-Tiffée E. Electrochimica Acta,2014,131,20. 12 Liu G, Zhang Y, Wu M, et al. Construction and Building Materials,2017,157,357. 13 Galván J C, Larrea M T, Braceras I, et al. Journal of Alloys and Compounds,2016,676,414.