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| Corrosion Resistance Mechanisms of Passive Films Formed on Low Alloy Rebar Steels in Liquor of Cement Extract |
Ming LIU1,2( ),Xuequn CHENG3,Xiaogang LI3,4,Tianjian LU1,5 |
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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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. TheIcorrof 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.
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Received: 28 November 2017
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| Fund: Supported by National Natural Science Foundation of China(51801149);China Postdoctoral Science Foundation(2017M620448) |
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Corresponding Authors:
Ming LIU
E-mail: liuming0313@xjtu.edu.cn
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