含Cr耐蚀钢筋在模拟高碱性混凝土孔隙液中的钝化行为研究

doi:10.11900/0412.1961.2023.00203

金属学报 DOI: 10.11900/0412.1961.2023.00203

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含Cr耐蚀钢筋在模拟高碱性混凝土孔隙液中的钝化行为研究

王慕亮^1,2 孙玉朋^1,2 陈磊^1,2 魏洁² 董俊华²

1 中国科学技术大学材料科学与工程学院沈阳 110016

2 中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016

Study on Passive Behavior of Corrosion-Resistant Steel Bars Containing Cr in Simulated High-Alkaline Concrete Pore Solution

WANG Muliang ^1,2, SUN Yupeng ^1,2, CHEN Lei ^1,2, WEI Jie ², DONG Junhua ²

1 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

2 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要: 为研究不同Cr含量（0 wt.%, 3 wt.%和9 wt.%）的耐蚀钢筋（20MnSi钢，3Cr钢和9Cr钢）在模拟高碱性混凝土孔隙液中的钝化行为，采用电化学测试技术（开路电位、电化学阻抗谱、极化曲线以及MS曲线）研究了钢筋表面钝化膜性能随时间的变化特征，此外通过XPS对钝化膜成分与结构进行分析。研究发现，在模拟高碱性混凝土孔隙液中，钢筋表面会生成层状结构钝化膜，钝化膜的结构、组成及保护性与钢筋中Cr元素含量和钝化时间密切相关。20MnSi钢的钝化膜，外层主要为Fe(Ⅲ)化合物，内层主要为Fe(Ⅱ)氧化物。3Cr钢和9Cr钢的钝化膜外层由Fe(Ⅲ)和Cr(Ⅲ)的氧化物和氢氧化物组成，内层由Fe(Ⅱ)氧化物和Cr(Ⅲ)的化合物组成。三种钢筋形成的钝化膜在-0.8VSCE到0.2VSCE电位区间内表现为n型半导体，且随浸泡时间增加，钝化膜中缺陷减少，钢的腐蚀电流密度减小，耐蚀性能有所提高。Cr含量越高，相同时间形成的钝化膜点缺陷密度越低，钝化膜越致密，钢筋耐蚀性能越好。

关键词 ：耐蚀钢筋, 混凝土模拟液, 钝化膜, 电化学测试

Abstract：To study the passive behavior of corrosion-resistant rebars (20MnSi steel, 3Cr steel, and 9Cr steel) with different Cr contents (0 wt.%, 3 wt.%, and 9 wt.%) in simulated high-alkaline concrete pore solution, electrochemical measurements (including open circuit potential, electrochemical impedance spectroscopy, polarization curve, and MS curve) were used to study the changes in the properties of the passive film on the surface of the rebars over time. In addition, XPS was used to analyze the composition and structure of the passive film. The study found that a layered passive film was formed on the surface of the rebars in simulated high-alkaline concrete pore solution, and the structure, composition, and protective properties of the passive film were closely related to the Cr element content and passive time in the rebars. The passive film of 20MnSi steel was mainly composed of Fe(III) compounds in the outer layer and Fe(II) oxides in the inner layer. The outer layer of the passive film of 3Cr steel and 9Cr steel was composed of Fe(III) and Cr(III) oxides and hydroxides, and the inner layer was composed of Fe(II) oxides and Cr(III) compounds. The passive films formed by the three types of rebars exhibited n-type semiconductor properties in the potential range of -0.8VSCE to 0.2VSCE, and as the immersion time increased, the defect density in the passive film decreased, the corrosion current density of the rebars decreased, and the corrosion resistance improved. The higher the Cr content, the lower the point defect density of the passive film formed in the same time, the denser the passive film, and the better the corrosion resistance of the rebars.

Key words： corrosion-resistant steel bar concrete simulating solution passive film electrochemical tests

收稿日期: 2023-05-06

ZTFLH:

TG174

基金资助:辽宁省科技重大专项资助

通讯作者: 魏洁

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引用本文:

王慕亮孙玉朋陈磊魏洁董俊华. 含Cr耐蚀钢筋在模拟高碱性混凝土孔隙液中的钝化行为研究[J]. 金属学报, 10.11900/0412.1961.2023.00203.

链接本文:

https://www.ams.org.cn/CN/Y0/V/I/0

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