Passive Films Formed on Seawater Corrosion Resistant Rebar 00Cr10MoV in Simulated Concrete Pore Solutions

doi:10.11902/1005.4537.2015.182

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (5): 441-449 DOI: 10.11902/1005.4537.2015.182

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Passive Films Formed on Seawater Corrosion Resistant Rebar 00Cr10MoV in Simulated Concrete Pore Solutions

Jianchun ZHANG¹(

),Jingyang JIANG²,Yang LI¹,Jinjie SHI²,Longfei ZUO¹,Danqian WANG²,Han MA¹

1. Institute of Research of Iron & Steel, Shasteel, Zhangjiagang 215625, China
2. School of Material Science and Engineering, Southeast University, Nanjing 211189, China

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Abstract

The electrochemical corrosion behavior of the seawater corrosion resistant rebar steel 00Cr10MoV and the formed passive films on this rebar in simulated concrete pore solutions were examined by means of electrochemical impedance spectroscopy (EIS), polarization curves and X-ray photoelectron spectroscopy (XPS). While the effect of Cl^- in solutions on the formation of passive films was also investigated. The results show that passive films formed on the 00Cr10MoV steel in simulated concrete pore solutions were composed of FeO, Cr₂O₃, γ-FeOOH and CrOOH. The Cl^- prevented the formation of passive films on the steel, and thereby resulted in decrease of pitting potential and charge-transfer resistance, but in little impact on the passive current density. The passive films formed on the steel after immersion in artificial solutions for 240 h exhibited excellent corrosion resistance to Cl^- solutions, which could maintain a large charge-transfer resistance of 2.755×10⁶ Ωcm² in solutions with Cl^- concentration as high as 5 mol/L. In general, the 00Cr10MoV steel exhibited resistance to Cl^- attack superior to 20MnSiV steel.

Key words: seawater corrosion resistant rebar simulated concrete pore solution passive film electrochemical impedance spectroscopy charge-transfer resistance

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	Jianchun ZHANG
	Jingyang JIANG
	Yang LI
	Jinjie SHI
	Longfei ZUO
	Danqian WANG
	Han MA

Cite this article:

Jianchun ZHANG,Jingyang JIANG,Yang LI,Jinjie SHI,Longfei ZUO,Danqian WANG,Han MA. Passive Films Formed on Seawater Corrosion Resistant Rebar 00Cr10MoV in Simulated Concrete Pore Solutions. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 441-449.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.182 OR https://www.jcscp.org/EN/Y2016/V36/I5/441

Table 1 Chemical compositions of 00Cr10MoV and 20MnSiV steels (mass fraction / %)

Fig.1 XPS results of all elements of passive films formed on 00Cr10MoV (a) and 20MnSiV (b) rebars afterimmersion in simulated concrete pore solution without Cl^- for 240 h

Fig.2 XPS results of Fe (a, c, e) and Cr (b, d, f) in the depths of 10 nm (a, b), 40 nm (c, d), 100 nm (e, f) from the top surface of passive film formed on 00Cr10MoV specimen after immersion in simulated concrete pore solution without Cl^- for 240 h

Fig.3 Depth profiles of Fe, Cr, O in passive film formed on 00Cr10MoV steel after immersion for 240 h in solutionswithout Cl^- (a) and with 0.6 mol/L Cl^- (b)

Fig.4 XPS results of Fe (a) and Cr (b) in the 10 nm depth from the top surface of passive film formed on 20MnSiV specimen after immersion in simulated concrete pore solution without Cl^- for 240 h

Fig.5 Polarization curves of 00Cr10MoV and 20MnSiV steels after immersion for 0.5 h in solutions without (a) and with (b) 0.6 mol/L Cl^-

Fig.6 Nyquist (a, c) and impedance module (b, d) plots of two steels after immersion for 0.5 h in the solutions without Cl^- (a, b) and with 0.6 mol/L Cl^- (c, d)

Fig.7 Equivalent circuit for EIS

Table 2 Fitting results of EIS

Fig.8 Variations of corrosion potentials of two steels with the concentration of Cl^- in simulated solution

Fig.9 Nyquist (a, c) and impedance module (b, d) plots of 00Cr10MoV (a, b) and 20MnSiV (c, d) samples after immersion in simulated solutions with different concentrations of Cl^-

Fig.10 R_t vs Cl^- concentration for 00Cr10MoV and 20MnSiV steels

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