Passivation and electrochemical behavior of 316L stainless steel in chlorinated simulated concrete pore solution
Passivation and electrochemical behavior of 316L stainless steel in chlorinated simulated concrete pore solution
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DOI：
10.1016/j.apsusc.2016.12.180
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发表时间：
2017-04-01
影响因子：
6.7
通讯作者：
Li, Xiaogang
中科院分区：
文献类型：
--
作者：
Luo, Hong;Su, Huaizhi;Li, Xiaogang
采用动电位法、电化学阻抗法研究了316L不锈钢在不同pH值的氯化模拟混凝土孔隙溶液中的钝化及电化学行为。采用X射线光电子能谱（XPS）、二次离子质谱（西姆斯）和扫描电子显微镜（SEM）分别对钝化膜的组成和表面形貌进行了研究。结果表明，pH值对钝化膜的亚稳态点蚀敏感性、稳态点蚀敏感性和钝化膜的组成均有影响。长时间浸泡后，在此环境中可形成双层结构的钝化膜。钝化膜的最外层出现了钝化膜，进一步提高了钝化膜的稳定性。316L不锈钢在未碳化的模拟混凝土孔隙溶液中具有良好的耐点蚀性能，主要是由于钝化膜中Cr/Fe比高和钝化膜中的铬酸根离子的存在。(C)2016爱思唯尔B. V.保留所有权利。
In this paper, the passivation and electrochemical behavior of 316L stainless steel in chlorinated simulated concrete pore solutions at different pH was evaluated by potentiodynamic measurements, electrochemical impedance spectroscopy. The composition of the passive film and surface morphology were investigated by X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS), and scanning electron microscopy, respectively. The results reveal that metastable pitting susceptibility, stable pitting corrosion, and composition of the passive film are influenced by pH value. After long time immersion, a bilayer structure passive film can be formed in this environment. The appearance of molybdates on the outermost surface layer, further enhancing the stability of the passive film. Moreover, the good pitting corrosion resistance of 316L stainless steel in simulated concrete pore solution without carbonated is mainly due to the presence of high Cr/Fe ratio and molybdates ions within the passive film. (C) 2016 Elsevier B.V. All rights reserved.