Anodic Polarization Characteristics of Rebar Steel HRB400 in Simulated Concrete Pore Fluid

doi:10.11902/1005.4537.2023.124

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (2): 422-428 DOI: 10.11902/1005.4537.2023.124

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Anodic Polarization Characteristics of Rebar Steel HRB400 in Simulated Concrete Pore Fluid

SHANG Baihui¹, MA Yuantai², MENG Meijiang², LI Ying²(

), LOU Ming³, BAI Jing¹

^1.Liaoning Provincial Engineering Research Center for High Value Utilization of Magnesite, School of Materials Science and Technology, Yingkou Institute of Technology, Yingkou 115014, China
^2.Corrosion and Protection Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Yingkou Special Automobile Bearing Company, Yingkou 115004, China

Cite this article:

SHANG Baihui, MA Yuantai, MENG Meijiang, LI Ying, LOU Ming, BAI Jing. Anodic Polarization Characteristics of Rebar Steel HRB400 in Simulated Concrete Pore Fluid. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 422-428.

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Abstract

In order to acquire the critical chloride ion concentration for the break-down of passivation film in the initial carbonization environment of concrete. According to the basic principle of electrochemical reaction, the anodic polarization characteristics of rebar steel HRB400 in a simulated initial carbonized concrete solution were studied by means of open-circuit potential- and anode polarization curve-measurement. Results showed that there was a linear relationship between the breakdown potential and the chloride ion concentration in logarithmic plots, and the rationality of passivation potential and tranpassivation potential as the key parameters of the breakdown potential was analyzed. Based on this, the upper limit [Cl^-]_u and lower limit [Cl^-]_l of critical chloride ion concentration for rebar steel HRB400 are obtained. Accordingly, the relationship between pH value and chloride concentration of pitting corrosion sensitivity of the rebar steel was drawn. The service status of rebar steel HRB400 in the pH range of 12.5-11.0 is evaluated, and the expressions of the upper limit [Cl^-]_u and lower limit [Cl^-]_l of the critical chloride ion concentration and pH value are given.

Key words: reinforced concrete anodic polarization passivation potential breakdown potential transpassivation potential

Received: 26 April 2023 32134.14.1005.4537.2023.124

ZTFLH:

TG174

Fund: High-level Talents Research Project of Yingkou Institute of Technology(YJRC202018);Liaoning Provincial Education Department Scientific Research Project (Youth Project)(LJKQZ2021182)

Corresponding Authors: LI Ying, E-mail: liying@imr.ac.cn

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	SHANG Baihui
	MA Yuantai
	MENG Meijiang
	LI Ying
	LOU Ming
	BAI Jing

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.124 OR https://www.jcscp.org/EN/Y2024/V44/I2/422

Fig.1 Current density-time curve of rebar specimen under a constant cathodic potential of -1 V

Fig.2 Anodic polarization curves of rebar specimen in simulated concrete pore solutions (chloride free) with different pH values

Table 1 Passivation potentials (E_p) and transpassivation potentials (E_tr) of steel rebar in simulated concrete pore solutions with different pH values

Fig.3 E_tr values of rebar specimen in simulated concrete pore solutions (chloride free) with different pH values

Fig.4 E-I diagram of apparent anode polarization curve and three electrode reactions

Fig.5 Anodic polarization curves of rebar specimen in simulated concrete pore solutions with different contents of chloride: (a) pH = 12.5, (b) pH = 12.0, (c) pH = 11.5, (d) pH = 11.0

Fig.6 Breakdown potential (E_b) vs. lg[Cl^-] curves for rebar specimen in simulated concrete pore solutions with pH values of 12.5 (a) and 12.0, 11.5 and 11.0 (b)

Table 2 Upper and lower limit values of critical chloride ion concentration for pitting corrosion of rebar sample

Fig.7 Dependances of the content of chloride ion of pitting sensitivity of steel rebar on pH value (in the range from 11 to 12.5)

Fig.8 Variations of the upper limit [Cl^-]_u and lower limit [Cl^-]_l of critical chloride ion concentration with pH value in logarithmic coordinates

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