Passivation Behavior of Steel Bar Subjected to Tensile Stress in Simulated Concrete Pore Solution

doi:10.11902/1005.4537.2024.026

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (6): 1547-1556 DOI: 10.11902/1005.4537.2024.026

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Passivation Behavior of Steel Bar Subjected to Tensile Stress in Simulated Concrete Pore Solution

DONG Zheng¹^,², MAO Yongqi¹, MENG Zhou¹, CHEN Xiangxiang¹, FU Chuanqing¹^,²(

), LU Chentao³

1. College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China
2. Key Laboratory of Civil Engineering Structures & Disaster Prevention and Mitigation Technology, Hangzhou 310023, China
3. Zhejiang Zhejiao Testing Technology Co., Ltd., Hangzhou 310030, China

Cite this article:

DONG Zheng, MAO Yongqi, MENG Zhou, CHEN Xiangxiang, FU Chuanqing, LU Chentao. Passivation Behavior of Steel Bar Subjected to Tensile Stress in Simulated Concrete Pore Solution. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1547-1556.

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Abstract

The present study aims to investigate the passivation behavior of steel bar subjected to tensile stress in a simulated concrete pore solution (SCPS). The passivation behavior of the stressed steel was studied by electrochemical techniques including open circuit potential, linear polarization resistance, cyclic voltammetry, electrochemical impedance spectroscopy and electrochemical noise measurement. The passive film of the stressed steel was characterized by XPS. Results indicated that the applied tensile stress enhanced the redox activity in highly alkaline SCPS, where the enhancement was proportional to the level of tensile stress. Nevertheless, the increment of tensile stress led to passive film with a higher value of Fe²⁺/Fe³⁺and therefore a poorer protectiveness. As such, tensile stress especially high stress level of tension (over 60% yield strength) significantly reduced the resistance of passive film, the noise resistance, as well as the polarization resistance, leading to a higher value of current density of the passive steel.

Key words: simulated concrete pore solution steel bar passivation tensile stress electrochemical technique

Received: 16 January 2024 32134.14.1005.4537.2024.026

ZTFLH:

TG178

Fund: Zhejiang Provincial Natural Science Foundation of China(LQ22E080017);National Natural Science Foundation of China(52208294);National Natural Science Foundation of China(52378271)

Corresponding Authors: FU Chuanqing, E-mail: chqfu@zjut.edu.cn

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	DONG Zheng
	MAO Yongqi
	MENG Zhou
	CHEN Xiangxiang
	FU Chuanqing
	LU Chentao

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.026 OR https://www.jcscp.org/EN/Y2024/V44/I6/1547

Fig.1 Metallographic micrograph of steel specimen

Fig.2 Stress-strain curve of steel specimen

Table 1 Stress levels of steel specimens

Fig.3 Steel specimen (a) and illustration of loading device (b)

Table 2 Composition of simulated concrete pore solution

Fig.4 Electrochemical test of the sample under stress

Fig.5 Results of potential of steel during passivation under different stress conditions

Fig.6 Results of polarization resistance (R_p) versus time

Fig.7 Results of current density (I_corr) versus time

Fig.8 Cyclic voltammetry curve of each group of steel specimens immersed in simulated concrete pore solution for 3 d (a) and 14 d (b)

Fig.9 Nyquist (a1-a5), phase angle (b1-b5) and impedance module (c1-c5) plots for passivation of steel bar in the cases of N (a1-c1), T1 (a2-c2), T2 (a3-c3), T3 (a4-c4) and T4 (a5-c5)

Fig.10 Equivalent circuit diagram for fitting^[22]

Fig.11 Results of passivation film resistance (a) and charge transfer resistance of steel (b) in different stress conditions

Fig.12 Results of PSD curve of steel at the time of 14 d passivation in the cases of N (a), T1 (b), T2 (c), T3 (d), and T4 (e)

Fig.13 Results of white noise level in the cases of different stress conditions

Fig.14 Results of noise resistance in the cases of different stress conditions

Fig.15 XPS spectra of iron for passive film of specimen T3 in the cases of Sputtering times = 0 (a)，Sputtering times = 1 (b)，Sputtering times = 2 (c)，Sputtering times = 3 (d)，Sputtering times = 4 (e), and profile of elements Fe and O obtained from the XPS survey spectra (f)

Fig.16 Results of Fe²⁺/Fe³⁺ in the passive film of steel after 14 d of passivation versus sputtering depth

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