Passivation Behavior of Super Austenitic Stainless Steels in Simulated Flue Gas Desulfurization Condensate

doi:10.11902/1005.4537.2022.107

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 408-414 DOI: 10.11902/1005.4537.2022.107

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Passivation Behavior of Super Austenitic Stainless Steels in Simulated Flue Gas Desulfurization Condensate

HE Zhihao¹^,², JIA Jianwen¹^,², LI Yang³, ZHANG Wei³, XU Fanghong³, HOU Lifeng¹^,²(

), WEI Yinghui¹^,²

^1.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
^2.Shanxi Engineering Research Center for Corrosion & Protection, Taiyuan 030024, China
^3.State Key Laboratory of Advanced Stainless Steel, Taiyuan Iron and Steel (Group) Co. Ltd., Taiyuan 030003, China

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Abstract

The passivation behavior of austenitic stainless steels 254SMo, 904L and 316L in a simulated flue gas desulfurization condensate was studied by potentiodynamic polarization, potentiostatic polarization, Mott-Schottky and XPS methods. The results show that, with the increase of Mo content, the passive region becomes larger, the pitting potential becomes more positive, and the passivation current density decreases for the steels. Among others, 254SMo steel exhibits the best corrosion resistance, which means that 254SMo steel is more suitable to be used in flue gas desulfurization environment. At the same time, with the increase of pH value of the simulated solution, the flat-band potential of the three steels all shifts negatively, and the value of the donor density would be decreased for their passivation film, indicating that the defects of the passivation film decreased, and the corrosion resistance would be increased.

Key words: super austenitic stainless steel FGD passivation behavior

Received: 12 April 2022 32134.14.1005.4537.2022.107

ZTFLH:

TG174

Fund: Central Government Guided Local Special Funds(YDZX20191400002094);Key Scientific Research Project in Shanxi Province(20191102006)

About author: HOU Lifeng, E-mail: houlifeng@126.com

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	Zhihao HE
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	Yinghui WEI

Cite this article:

HE Zhihao, JIA Jianwen, LI Yang, ZHANG Wei, XU Fanghong, HOU Lifeng, WEI Yinghui. Passivation Behavior of Super Austenitic Stainless Steels in Simulated Flue Gas Desulfurization Condensate. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 408-414.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.107 OR https://www.jcscp.org/EN/Y2023/V43/I2/408

Table 1 Chemical compositions of three test stainless steels (mass fraction / %)

Fig.1 Potentiodynamic polarization curves of 254Smo (a), 904L (b) and 316L (c) stainless steels at different pH values respectively, and at pH=3 (d)

Fig.2 M-S curves of 254SMo (a), 904L (b) and 316L (c) stainless steels at different pH values and at pH=3 (d)

Fig.3 XPS spectra of O 1s in the passive films formed on 254SMo stainless steel at pH=1 (a) and pH=3 (b)

Table 2 Donor densities and flat band potentials of the passivation films of three steels

Fig.4 XPS spectra of Cr 2p in the passive films formed on 254SMo stainless steel at pH=1 (a) and pH=3 (b)

Fig.5 XPS spectra of Fe 2p in the passive film formed on 254SMo stainless steel at pH=1 (a) and pH=3 (b)

Fig.6 XPS spectra of Mo 3d in the passive films formed on 254SMo stainless steel at pH=1 (a) and pH=3 (b)

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