Effect of Cl- and HSO3- on Corrosion Behavior of 439 Stainless Steel Used in Construction

doi:10.11902/1005.4537.2021.126

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (3): 493-500 DOI: 10.11902/1005.4537.2021.126

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Effect of Cl^- and HSO₃^- on Corrosion Behavior of 439 Stainless Steel Used in Construction

CHEN Hao¹, FAN Zhibin², CHEN Zhijian¹^,³, ZHOU Xuejie¹^,³(

), ZHENG Penghua¹^,³, WU Jun¹^,⁴

^1.Wuhan Institute of Materials Protection Co. Ltd. , Wuhan 430030, China
^2.State Grid Shandong Electric Power Research Institute, Jinan 250001, China
^3.Wuhan Materials Corrosion National Observation and Research Station, Wuhan 430030, China
^4.Yuli Materials Corrosion National Observation and Research Station, Yuli 841500, China

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Abstract

The pitting corrosion behavior and mechanism of ferritic stainless steel 439 in various solutions with different concentration of anions Cl^- and HSO₃^- was studied by means of electrochemical test, X-ray diffractometer, X-ray photoelectron spectroscopy, as well as molecular dynamics simulation. Electrochemical test results show that, the corrosion rate of 439 stainless steel will be significantly increased in solutions with simultaneous presence of Cl^- and HSO₃^- rather than that in solutions containing only one of the two anions. The molecular dynamics simulation results show that, compared with solutions containing only one of the two anions, in solutions of the mixed anions the corrosive ions were adsorbed much strongly to the passive film, and their diffusion coefficient is also significantly improved. The corrosion rate of 439 stainless steel in Cl^- containing solutions will gradually increase with the increase of Cl^- concentration, whereas after reaching the critical point, the corrosion rate will gradually decrease. However, when Cl^- and HSO₃^- co-exist in the solution, the corrosion of 439 stainless steel is accelerated.

Key words: 439 stainless steel passivation film pitting corrosion electrochemical test molecular dynamics simulation

Received: 07 June 2021

ZTFLH:

TG172.3

Fund: State Grid Corporation of China Headquarters Technology Project(5200-202016471A-0-0-00)

Corresponding Authors: ZHOU Xuejie E-mail: zhouxj11@163.com

About author: ZHOU Xuejie, E-mail：zhouxj11@163.com

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Cite this article:

CHEN Hao, FAN Zhibin, CHEN Zhijian, ZHOU Xuejie, ZHENG Penghua, WU Jun. Effect of Cl^- and HSO₃^- on Corrosion Behavior of 439 Stainless Steel Used in Construction. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 493-500.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.126 OR https://www.jcscp.org/EN/Y2022/V42/I3/493

Fig.1 Polarization curves (a), Nyqusit diagram (b) and equivalent circuit diagram (c) for 439 stainless steel in NaCl solution with different concentrations

Table 1 Fitting electrochemical parameters of polarization curves and EIS of 439 stainless steel

Fig.2 Cyclic polarization curves of 439 stainless steel in different concentrations of NaHSO₃ solutions (a) and NaCl+NaHSO₃ mixed solutions (b)

Table 2 Characteristic parameters of cyclic polarization curves

Fig.3 Nyquist (a) and Bode (b) diagrams in different concentrations of NaHSO₃ solutions and NaCl+NaHSO₃ mixed solutions

Table 3 Fitting parameters of EIS based on equivalent circuit

Fig.4 XRD pattern of 439 stainless steel

Fig.5 Full XPS spectrum (a) and fine XPS spectra of Cr2P (b) , Fe2p (c) and O1s (c)

Fig.6 Modeling of three corrosion systems: (a) Fe₂O₃ (1 $1 ˉ$ 2), (b) Cr₂O₃ (0 0 1), (c) FeO (1 1 1)

Fig.7 Equilibrium criterion of molecular dynamics simulation: (a) energy-time curve; (b) temperature-time curve

Table 4 Surface interaction energies of corrosion ions and metal oxides (kcal·mol^-1)

Table 5 Calculated diffusion coefficients of corrosion ions

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