Frumkin Correction of Corrosion Electric Field Generated by 921A Steel
Xu Qinglin1, Wang Xiangjun1, Zhang Jianchun1, Liu Dehong2
1. College of Electrical Engineering Naval University of Engineering Wuhan 430033 China; 2. City College Wuhan University of Science and Technology Wuhan 430083 China
Abstract：In order to study the Frumkin correction effect of corrosion electric field in different concentrations of sodium chloride solution, the electric double layer (EDL) capacitance of 921A steel electrode at the corrosion potential was acquired by electrochemical impedance spectroscopy (EIS) Accordingly the experimental value of diffuse layer potential was calculated. The theoretical relationship between diffuse layer potential and potential of EDL and concentration of supporting electrolyte was derivedaccording to the Stern model of EDL. Therefore, the theoretical value of diffuse layer potential was obtained. According to the Frumkin correction theory, the electrode kinetics of cathode and anode were corrected respectively, and the modified Tafel equation related to diffuse layer potential was acquired. The uncorrected and corrected Tafel equation was used as the boundary condition of the boundary element model (BEM) of corrosion electric fieldfor 921A steel plate, so the corrosion electric field distributions before and after Frumkin correction were obtained and compared with the experimental results. The results show that the corrected amplitude of electric field modulus is closer to experimental values, indicating that it is necessary to correct the Tafel boundary condition during simulation process. Moreover, when the concentration of sodium chloride solution is 1.5%, 2.5% and 3.5%, the correction effectis 12.2%, 10.8%, and 9.4%, respectively.
徐庆林, 王向军, 张建春, 刘德红. 921A钢板腐蚀电场的Frumkin修正[J]. 电工技术学报, 2020, 35(14): 2951-2958.
Xu Qinglin, Wang Xiangjun, Zhang Jianchun, Liu Dehong. Frumkin Correction of Corrosion Electric Field Generated by 921A Steel. Transactions of China Electrotechnical Society, 2020, 35(14): 2951-2958.
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2020, Vol. 35 
