Assessment on Corrosion Behavior of Q235 Steel in a Simulated Concrete Pore Liquid Containing Chloride by Electrochemical Noise

被引：0
|
作者：
Tang R. [1 ]
Liu G. [1 ]
Liu Y. [1 ]
Shi C. [1 ]
Zhang B. [1 ]
Tian J. [1 ]
Gan H. [1 ]
机构：
[1] School of Material Science and Engineering, Nanchang Hangkong University, Nanchang
来源：
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2021年 / 35卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Corrosion behavior research; Electrochemical noise; Material failure and protection; Q235; steel; Simulated concrete pore liquid;
D O I：
10.11901/1005.3093.2020.550
中图分类号：
学科分类号：
摘要：
The corrosion process of Q235 steel in 0.5 mol/L NaCl saturated Ca(OH)2 solution (SCP) was investigated by electrochemical noise technology (EN) and electrochemical impedance spectroscopy (EIS), and the noise data were analyzed in time domain analysis and frequency domain analysis, and the impedance spectrum data were analyzed by way of equivalent circuit. The surface morphology and structure of the tested Q235 steel were characterized by SEM combined with EDS and XRD. The results show that the corrosion process of Q235 steel in SCP solution can be differentiated into three stages: (Ⅰ) the formation and cracking stage of passivation film, (Ⅱ) the metastable pitting corrosion stage and (Ⅲ) the Ca2+ deposition and corrosion product formation stage. In the stage (I), the amplitude of current noise fluctuation, the current noise standard deviation S I and the white noise level W I are relatively small, but the noise resistance R n is relatively large; In the stage (Ⅱ), the amplitude of current noise fluctuation is large, S I and W I show a step-wise increase, and R n decreases significantly; In the stage (Ⅲ), the amplitude of current noise fluctuation increases to 200nA, and S I, W I, R n fluctuate relatively smoothly. When Q235 steel is corroded in SCP solution for 10 days, Fe2O3 with dispersed CaCO3 crystallites can be observed on the surface of Q235 steel. At this time Warburg impedance appears, while the corrosion reaction is jointly controlled by the charge transfer and O2 diffusion process. © 2021, Editorial Office of Chinese Journal of Materials Research. All right reserved.
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页码：526 / 534
页数：8
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