Analysis of Cl- Corrosion Resistance of High Mo Super Austenitic Stainless Steels

doi:10.11902/1005.4537.2022.100

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (5): 765-770 DOI: 10.11902/1005.4537.2022.100

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Analysis of Cl^- Corrosion Resistance of High Mo Super Austenitic Stainless Steels

LV Yingxi(

)

Shanxi Mechanical and Electrical Design and Research Institute Co. Ltd., Taiyuan 030009, China

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Abstract

The increase of Mo content can improve the corrosion resistance of austenitic stainless steel. In this paper, the corrosion behavior of four austenitic stainless steels 316L, 904L, S31254 and S31254-B with different Mo content in 10%NaCl solution has been comparatively examined. The effect of solution treatment and low temperature aging treatment on the corrosion resistance of steels was compared. The microstructure, corrosion resistance and surface corrosion morphology of the four stainless steels were characterized by means of scanning electron microscope, electrochemical scanning polarization curves and electrochemical impedance spectroscope. The results show that the four stainless steels present different corrosion performance in 10%NaCl solution, their corrosion resistance can be ranked as follows: low temperature aging state>solid solution state for all steels; whilst S31254-B>S31254>904L>316L. The increase of Mo content, the addition of B and the aging treatment at low temperature can improve the corrosion resistance of the steels. Meanwhile, B can promote the formation of Cr- and Mo-rich oxides in the outer layer of passivation film, which makes the surface of passivation film much compact, and the lean-Cr and -Mo regions at grain boundaries can be slowed down, therewith the corrosion resistance of the steels can be improved significantly.

Key words: Austenitic stainless steel corrosion resistance electrochemical corrosion Mo

Received: 09 April 2022

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Corresponding Authors: LV Yingxi E-mail: LYX6746@163.com

About author: LV Yingxi, E-mail: LYX6746@163.com

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Cite this article:

LV Yingxi. Analysis of Cl^- Corrosion Resistance of High Mo Super Austenitic Stainless Steels. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 765-770.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.100 OR https://www.jcscp.org/EN/Y2022/V42/I5/765

Table 1 Chemical compositions of four stainless steel (mass fraction / %)

Fig.1 Micrographs of the solution-treated sample of 316L (a), 904L (b), S31254 (c), S31254-B (d) stainless steel

Fig.2 Micrographs of the aging-treated sample of 316L (a), 904L (b), S31254 (c), S31254-B (d) stainless steel

Fig.3 EDS of grain boundary region of S31254-B stainless steel after low temperature aging at 410 ℃

Fig.4 Potentiodynamic polarization curves of solution-treated sample of 316L, 904L, S31254, S31254-B stainless steel (a), aging-treated at 410 ℃ sample of 316L, 904L, S31254, S31254-B stainless steel (b), solution-treated and aging-treated at 410 ℃ sample of 316L, 904 stainless steel (c), solution-treated and aging-treated at 410 ℃ sample of 31254-B, S31254 stainless steel (d) in 10%NaCl solution

Table 2 Electrochemical parameters of potentiodynamic polarization for 316L, 904L, S31254 and S31254-B stainless steel

Fig.5 Impedance spectroscopy of solution-treated sample of 316L, 904L, S31254, S31254-B stainless stain (a), aging-treated at 410 ℃ sample of 316L, 904L, S31254, S31254-B (b), solution-treated and aging-treated at 410 ℃ sample of 31254-B, S31254 (c) and solution-treated and aging-treated at 410 ℃ sample of 316L, 904 stainless steel (d) in 10%NaCl solution

Fig.6 Surface corrosion morphologies of the solution-treated sample of 316L (a), 904L (b), S31254 (c), S31254-B (d) stainless steel after potentiodynamic polarization

Fig.7 Surface corrosion morphologies of the aging-treated sample of 316L (a), 904L (b), S31254 (c), S31254-B (d) stainless steel after potentiodynamic polarization

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