Effect of Strain on Passivation of Stainless Steel in a Simulated Concrete Pore Solution

doi:10.11902/1005.4537.2014.128

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (4): 372-378 DOI: 10.11902/1005.4537.2014.128

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Effect of Strain on Passivation of Stainless Steel in a Simulated Concrete Pore Solution

Xingguo FENG¹,Xiangyu LU²,Yu ZUO³,Da CHEN¹(

)

1. Key Laboratory of Coastal Disaster and Defence, Ministry of Education, Hohai University, Nanjing 210098, China
2. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
3. School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China

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Abstract

Passivation behavior of a deformed stainless steel in a simulated concrete pore solution was studied by means of open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and Mott-Schottky plots. The results show that with the increasing strain, the OCP and impedance of the steel decreased, whereas the concentration of oxygen vacancy in passive films increased. This result suggests that the passivation of the stainless steel is degraded by the increasing strain. In addition, the difference in passivation between the deformed samples would not be diminished with the increasing immersion time.

Key words: stainless steel concrete pore solution passivity Mott-Schottky

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Xingguo FENG,Xiangyu LU,Yu ZUO,Da CHEN. Effect of Strain on Passivation of Stainless Steel in a Simulated Concrete Pore Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 372-378.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.128 OR https://www.jcscp.org/EN/Y2015/V35/I4/372

Fig.1 Geometry of stainless steel specimen

Fig.2 OCP results of the deformed stainless steel in simulated concrete pore solution

Fig.3 Nyquist plots of the deformed stainless steel immersed in pore solution for 1 h (a), 8 h (b), 24 h (c) and 48 h (d)

Fig.4 Bode plots of the deformed stainless steel immersed in pore solution for 1 h (a), 8 h (b), 24 h (c) and 48 h (d)

Fig.5 Equivalent electrical circuit for modeling

the impedance data

Table 1 Fitted values of elements in equivalent circuit

Fig.6 Influences of deformation magnitude on the polarization resistance R_p (a) and space charge layer C_d (b) of stainless steel in simulated concrete pore solution

Fig.7 Mott-Schottky plots of deformed stainless steel after 2 h immersion in pore solution

Fig.8 Influence of deformation magnitude on the donor density of passive films on stainless steel

Fig.9 Influence of deformation magnitude on the thickness of the space charge layer

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