新型耐腐蚀钢筋在模拟混凝土孔隙溶液中的钝化膜生长机制：纳米结构与电化学研究
The Passive Film Growth Mechanism of New Corrosion-Resistant Steel Rebar in Simulated Concrete Pore Solution: Nanometer Structure and Electrochemical Study.
作者信息
Jiang Jin-Yang, Wang Danqian, Chu Hong-Yan, Ma Han, Liu Yao, Gao Yun, Shi Jinjie, Sun Wei
机构信息
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.
Jiangsu Key Laboratory of Construction Materials, Nanjing 211189, China.
出版信息
Materials (Basel). 2017 Apr 14;10(4):412. doi: 10.3390/ma10040412.
An elaborative study was carried out on the growth mechanism and properties of the passive film for a new kind of alloyed corrosion-resistant steel (CR steel). The passive film naturally formed in simulated concrete pore solutions (pH = 13.3). The corrosion resistance was evaluated by various methods including open circuit potential (OCP), linear polarization resistance (LPR) measurements, and electrochemical impedance spectroscopy (EIS). Meanwhile, the 2205 duplex stainless steel (SS steel) was evaluated for comparison. Moreover, the passive film with CR steel was studied by means of X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Atomic Force Microscope (AFM), and the Mott‑Schottky approach. The results showed that the excellent passivity of CR steel could be detected in a high alkaline environment. The grain boundaries between the fine passive film particles lead to increasing Cr oxide content in the later passivation stage. The filling of cation vacancies in the later passivation stage as well as the orderly crystalized inner layer contributed to the excellent corrosion resistance of CR steel. A passive film growth model for CR steel was proposed.
对一种新型合金耐腐蚀钢（CR钢）钝化膜的生长机制和性能进行了详细研究。钝化膜在模拟混凝土孔隙溶液（pH = 13.3）中自然形成。通过多种方法评估耐腐蚀性，包括开路电位（OCP）、线性极化电阻（LPR）测量和电化学阻抗谱（EIS）。同时，对2205双相不锈钢（SS钢）进行评估以作比较。此外，采用X射线光电子能谱（XPS）、透射电子显微镜（TEM）、原子力显微镜（AFM）和莫特-肖特基方法对CR钢的钝化膜进行了研究。结果表明，在高碱性环境中可以检测到CR钢具有优异的钝化性能。钝化膜细颗粒之间的晶界导致在后期钝化阶段Cr氧化物含量增加。后期钝化阶段阳离子空位的填充以及内层有序结晶有助于CR钢具有优异的耐腐蚀性。提出了CR钢的钝化膜生长模型。
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