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模拟混凝土孔隙溶液中合金耐蚀钢Cr10Mo1的钝化特性：pH值与氯化物的联合作用

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride.

作者信息

Ai Zhiyong, Sun Wei, Jiang Jinyang, Song Dan, Ma Han, Zhang Jianchun, Wang Danqian

机构信息

School of Materials Science and Engineering, Southeast University, Nanjing 211189, Jiangsu, China.

Jiangsu Key Laboratory of Construction Materials, Nanjing 211189, Jiangsu, China.

出版信息

Materials (Basel). 2016 Sep 1;9(9):749. doi: 10.3390/ma9090749.

DOI:10.3390/ma9090749
PMID:28773867
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5457108/
Abstract

The electrochemical behaviour for passivation of new alloy corrosion-resistant steel Cr10Mo1 immersed in alkaline solutions with different pH values (13.3, 12.0, 10.5, and 9.0) and chloride contents (0.2 M and 1.0 M), was investigated by various electrochemical techniques: linear polarization resistance, electrochemical impedance spectroscopy and capacitance measurements. The chemical composition and structure of passive films were determined by XPS. The morphological features and surface composition of the immersed steel were evaluated by SEM together with EDS chemical analysis. The results evidence that pH plays an important role in the passivation of the corrosion-resistant steel and the effect is highly dependent upon the chloride contents. In solutions with low chloride (0.2 M), the corrosion-resistant steel has notably enhanced passivity with pH falling from 13.3 to 9.0, but does conversely when in presence of high chloride (1.0 M). The passive film on the corrosion-resistant steel presents a bilayer structure: an outer layer enriched in Fe oxides and hydroxides, and an inner layer, rich in Cr species. The film composition varies with pH values and chloride contents. As the pH drops, more Cr oxides are enriched in the film while Fe oxides gradually decompose. Increasing chloride promotes Cr oxides and Fe oxides to transform into their hydroxides with little protection, and this is more significant at lower pH (10.5 and 9.0). These changes annotate passivation characteristics of the corrosion-resistant steel in the solutions of different electrolyte.

摘要

采用线性极化电阻、电化学阻抗谱和电容测量等多种电化学技术，研究了新型耐蚀钢Cr10Mo1在不同pH值（13.3、12.0、10.5和9.0）和氯化物含量（0.2 M和1.0 M）的碱性溶液中的钝化电化学行为。通过XPS确定了钝化膜的化学成分和结构。结合EDS化学分析，利用SEM对浸泡后的钢材的形貌特征和表面成分进行了评估。结果表明，pH值在耐蚀钢的钝化过程中起着重要作用，且该作用高度依赖于氯化物含量。在低氯化物（0.2 M）溶液中，随着pH值从13.3降至9.0，耐蚀钢的钝化性能显著增强，但在高氯化物（1.0 M）存在时则相反。耐蚀钢上的钝化膜呈现双层结构：外层富含铁的氧化物和氢氧化物，内层富含铬的化合物。膜的组成随pH值和氯化物含量而变化。随着pH值下降，膜中富集更多的铬氧化物，而铁氧化物逐渐分解。氯化物含量增加会促使铬氧化物和铁氧化物转化为几乎没有保护作用的氢氧化物，且在较低pH值（10.5和9.0）时这种情况更为明显。这些变化诠释了耐蚀钢在不同电解质溶液中的钝化特性。

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