Natural Passivation Behavior and Corrosion Resistance of HRB400 Steel in Simulated Concrete Pore Solution

doi:10.11902/1005.4537.2023.349

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (5): 1213-1222 DOI: 10.11902/1005.4537.2023.349

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Natural Passivation Behavior and Corrosion Resistance of HRB400 Steel in Simulated Concrete Pore Solution

SHI Xianfei, CHEN Xiaohua, MAN Cheng(

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School of Materials Science and Engineering, Ocean University of China, Qingdao 266400, China

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SHI Xianfei, CHEN Xiaohua, MAN Cheng. Natural Passivation Behavior and Corrosion Resistance of HRB400 Steel in Simulated Concrete Pore Solution. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1213-1222.

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Abstract

The natural passivation behavior of HRB400 steel in simulated concrete pore solution, i.e. a saturated Ca(OH)₂ solution with pH 12.5 was investigated via measurements of open circuit potential, electrochemical impedance spectra, and Mott-Schottky curves. The composition and structure of the passivation film were characterized by X-ray photoelectron spectroscope and atomic force microscope. Subsequently, the resistance to Cl^- attack of the passivation film formed by the natural passivation in saturated Ca(OH)₂ solution with varying pH values was further studied with dynamic potential polarization curve measurement, SVET technique, and SEM in terms of corrosion morphology and corrosion products. The results indicate that HRB400 steel requires at least 72 h to form a stable passivation film in simulated concrete pore solution, and the structure and composition of the passivation film are subsequently changed during the process. The stable passivation film exhibits excellent resistance to chloride ion attack with a critical chloride ion concentration range of 0.1 to 0.15 mol/L, which is well consistent with the results of SEM characterization.

Key words: HRB400 steel simulated concrete pore solution natural passivation passivation film critical chloride ion concentration

Received: 17 October 2023 32134.14.1005.4537.2023.349

ZTFLH:

TG174

Fund: National Key Research and Development Program of China(2021YFE0114000)

Corresponding Authors: MAN Cheng, E-mail: mancheng@ouc.edu.cn

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	SHI Xianfei
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https://www.jcscp.org/EN/10.11902/1005.4537.2023.349 OR https://www.jcscp.org/EN/Y2024/V44/I5/1213

Fig.1 Open-circuit potentials of HRB400 steel after passivation for different time in SCPS

Fig.2 Nyquist (a) and Bode (b) plots of HRB400 steel after passivation for different time in SCPS, and fitting values of R_p (c)

Fig.3 Equivalent circuit diagram used for EIS fitting: (a) passivation time of 1-24 h, (b) passivation time of 72-168 h

Table 1 Fitting electrochemical parameters of EIS of HRB400 steel passivated for different time in SCPS

Fig.4 Mott-Schottky curves (a) and N_D vs. time plot (b) for HRB400 steel passivated for different time in SCPS

Fig.5 XPS fine spectra of Fe 2p_3/2 for the passivating films of HRB400 steel passivated for different time (a), and contents of four iron compounds and Fe²⁺/Fe³⁺ ratios in these passivating films (b)

Fig.6 AFM images of surface morphologies and corresponding sectional heights for the passivating films formed after passivation for 1 h (a), 12 h (b), 24 h (c), 72 h (d), 120 h (e) and 168 h (f)

Table 2 Surface roughness values of the passivating films

Fig.7 Polarization curves of HRB400 steel in SCPS containing different concentrations of Cl^- (a), and corresponding breakdown potentials (b)

Fig.8 SVET results of HRB400 steel after 168 h passivation and 72 h immersion in SCPS containing the Cl^- concentrations of 0.01 mol/L (a), 0.05 mol/L (b), 0.1 mol/L (c), 0.2 mol/L (d), 0.3 mol/L (e), 0.4 mol/L (f), and corresponding values of I_a and I_c (g)

Fig.9 SEM surface morphologies of HRB400 steel after soaking for 168 h in SCPS containing the Cl^- concentrations of 0.01 mol/L (a), 0.05 mol/L (b), 0.1 mol/L (c), 0.2 mol/L (d), 0.3 mol/L (e) and 0.4 mol/L (f)

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