Characterisation of Passive Film on HRB400 Steel Rebar in Curing Stage of Concrete

doi:10.11901/1005.3093.2019.068

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 Baihui^1,³,MA Yuantai¹,MENG Meijiang¹,LI Ying^1,²(

)

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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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.

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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)

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	Baihui SHANG
	Yuantai MA
	Meijiang MENG
	Ying LI

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

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 R_p 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 2p_3/2 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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