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Chinese Journal of Materials Research  2019, Vol. 33 Issue (9): 659-665    DOI: 10.11901/1005.3093.2019.068
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Characterisation of Passive Film on HRB400 Steel Rebar in Curing Stage of Concrete
SHANG Baihui1,3,MA Yuantai1,MENG Meijiang1,LI Ying1,2()
1. Corrosion and Protection Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
3. School of Material Science and Technology, University of Science and Technology of China, Shenyang 110016, China
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Abstract  

The standard curing time of concrete is 28 days in order to guarantee the strength of the concrete. It is well known that a stable passive film can be formed on the surface of steel rebar in the alkaline pore fluid during the concrete curing stage, long before the steel rebar will be influenced by chloride ingress or concrete carbonation in the future. However, there is no consensus on the time conditions for the pre-passivation of the steel bars in the open literature. In this study, the growth process and characteristic evolution of the passive film formed on HRB400 steel rebar in a Ca(OH)2 saturated solution, which aims to simulate the medium in concrete pores during curing period, were studied by a series of electrochemical tests (open-circle potential (OCP), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curve (PDC)) and XPS. Results show that it will take 5 days to form a stable passive film on the surface of HRB400 steel rebar, and the passive film has a two-layered structure. In the initial stage of passivation, on the HRB400 steel surface a thin film mainly composed of Fe(II) products firstly formed, then on top of which, a film mainly composed of Fe(III) products would further form.

Key words:  materials failure and protection      HRB400 steel rebar      passive film      electrochemical tests      immersion time     
Received:  18 January 2019     
ZTFLH:  TG174.1  
Fund: National Basic Research Program of China(2015CB655105);National Natural Science Foundation of China(51671198)
Corresponding Authors:  Ying LI     E-mail:  liying@imr.ac.cn

Cite this article: 

SHANG Baihui,MA Yuantai,MENG Meijiang,LI Ying. Characterisation of Passive Film on HRB400 Steel Rebar in Curing Stage of Concrete. Chinese Journal of Materials Research, 2019, 33(9): 659-665.

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2019.068     OR     https://www.cjmr.org/EN/Y2019/V33/I9/659

ElementsCSiMnPSVFe
Content0.17~0.250.4~0.801.2~1.6≤0.045≤0.0450.03~0.06Bal.
Table 1  Chemical composition of HRB400 steel rebar (%, mass fraction)
Fig.1  OCP results of HRB400 steel after immersion in saturated Ca(OH)2 solution for different time
Fig.2  Nyquist (a) and Bode (b) plots of HRB400 steel immersed in saturated Ca(OH)2 solution for different time
Fig.3  Equivalent electrical circuit model used for fitting EIS data
Fig.4  Relationship between Rp and immersion time, obtained by fitting EIS data
Fig.5  PDC of HRB400 steel immersed in saturated Ca(OH)2 solution (pH=12.5) for different time
Fig.6  Fine XPS of Fe 2p3/2 in the passive film of HRB400 steel under different sputtering time and fitting curves
Fig.7  Relative contents of four kinds of iron products in the passive film of HRB400 steel under different sputtering time
Fig.8  Schematic diagrams of the passive film of HRB400 steel in simulated concrete pore solution (a) at initial passivation stage; (b) at final passivation stage
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