低合金钢筋在水泥萃取液中钝化膜的耐蚀机理研究

doi:10.11902/1005.4537.2017.203

中国腐蚀与防护学报

2018, Vol. 38

Issue (6): 558-564 DOI: 10.11902/1005.4537.2017.203

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低合金钢筋在水泥萃取液中钝化膜的耐蚀机理研究

刘明^1,²(

),程学群³,李晓刚^3,⁴,卢天健^1,⁵

1. 西安交通大学航天航空学院多功能材料与结构教育部重点实验室西安 710049
2. 西安交通大学机械结构强度与振动国家重点实验室西安 710049
3. 北京科技大学腐蚀与防护中心北京 100083
4. 中国科学院宁波材料技术与工程研究所宁波 315201
5. 南京航空航天大学机械结构力学与控制国家重点实验室南京 210016

Corrosion Resistance Mechanisms of Passive Films Formed on Low Alloy Rebar Steels in Liquor of Cement Extract

Ming LIU^1,²(

),Xuequn CHENG³,Xiaogang LI^3,⁴,Tianjian LU^1,⁵

1. MOE Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an 710049, China
2. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, China
3. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
4. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China
5. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;orrespondent: LIU Ming, E-mail: liuming0313@xjtu. edu. cn

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摘要:

采用动电位极化曲线、Mott-Schottky结合XPS和AES，分析研究了Cr对耐蚀钢筋在水泥萃取液中形成的钝化膜的耐蚀机理。结果表明，随着浸泡时间的延长，钢筋电极的自腐蚀电流密度 (I_corr) 降低，浸泡1 d后可以形成具有保护性的钝化膜。Cr含量的增加减小了钢筋钝化膜中的载流子密度，提高了其稳定性。Cr含量的增加抑制了Fe²⁺向Fe³⁺的氧化过程，从而提高了钢筋钝化膜的耐蚀性。耐蚀钢筋中的Cr参与了钝化膜的形成，稳定钝化膜则主要由Fe的氧化物组成；钝化膜内层为含Cr-Fe的氧化物，外层为Fe的氧化物；钝化膜的厚度在3~4 nm之间，随Cr含量的增加而略微增大。

关键词 ：耐蚀钢筋, 钝化膜, Mott-Schottky, X射线光电子能谱, 俄歇电子能谱

Abstract：

Influence of Cr content on the corrosion resistance of passive films formed on low alloyed rebar steels in liquor of cement extract was studied by means of electrochemical techniques, X-ray photoelectron spectrometer and auger electron spectroscopy. TheI_corrof steel electrodes is found to decrease with increasing immersion time, and protective passive films could form after 1 d immersion. The increase of Cr content decreases the carrier density of the passive films, thereby improves their stability. The increase of Cr content inhibits the oxidation process of Fe²⁺to Fe³⁺, thus enhance the corrosion resistance of the passive films. Stable passive films are primarily consisted of iron oxides with a thickness of 3~4 nm. As Cr is involved in the formation of passive films, which induces the formation of an inner layer of complex Cr-Fe oxides beneath the outer layer of Fe oxides. The film thickness slightly increases as the content of Cr increases.

Key words： corrosion resistance steel rebar passive film Mott-Schottky XPS AES

收稿日期: 2017-11-28

ZTFLH:

TG172

基金资助:国家自然科学基金(51801149);中国博士后基金(2017M620448)

通讯作者: 刘明 E-mail: liuming0313@xjtu.edu.cn

Corresponding author: Ming LIU E-mail: liuming0313@xjtu.edu.cn

作者简介: 刘明，男，1987年生，博士，助理研究员

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引用本文:

刘明,程学群,李晓刚,卢天健. 低合金钢筋在水泥萃取液中钝化膜的耐蚀机理研究[J]. 中国腐蚀与防护学报, 2018, 38(6): 558-564.
Ming LIU, Xuequn CHENG, Xiaogang LI, Tianjian LU. Corrosion Resistance Mechanisms of Passive Films Formed on Low Alloy Rebar Steels in Liquor of Cement Extract. Journal of Chinese Society for Corrosion and protection, 2018, 38(6): 558-564.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.203 或 https://www.jcscp.org/CN/Y2018/V38/I6/558

图1 HRB400及其3种Cr合金化的钢筋在水泥萃取液中浸泡不同时间后的极化曲线

图2 4种钢筋电极在水泥萃取液中浸泡7 d后的Mott-Schottky曲线

图3 4种钢筋电极在水泥萃取液中浸泡7 d后表面Fe2p3/2的XPS谱

图4 钢筋电极在水泥萃取液中浸泡7 d后表面Cr2p3/2的XPS谱

图5 钢筋电极在水泥萃取液中浸泡7 d后表面O1s的XPS谱

图6 4种钢筋电极在水泥萃取液中浸泡7 d后Fe，Cr和O从表面沿深度分布的XPS分析结果

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