NaCl Induced Corrosion of Three Austenitic Stainless Steels at High Temperature

doi:10.11902/1005.4537.2021.086

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (2): 288-294 DOI: 10.11902/1005.4537.2021.086

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NaCl Induced Corrosion of Three Austenitic Stainless Steels at High Temperature

YI Pu¹, HOU Lifeng¹, DU Huayun¹, LIU Xiaoda¹, JIA Jianwen¹, LI Yang², ZHANG Wei², XU Fanghong², WEI Yinghui¹(

)

^1.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
^2.State Key Laboratory of Advanced Stainless Steel, Taiyuan Iron and Steel (Group) Co. Ltd. , Taiyuan 030003, China

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Abstract

Waste incinerators are faced with many high-temperature corrosion problems because they work at high temperatures all year round. The NaCl induced hot corrosion behavior of three novel austenitic stainless steels 254SMo, 904L and 317L in NaCl salt at 750, 850 and 950 ℃ was studied in order to simulate the corrosion emerged on the fire side of tubes in waste incinerator by means of corrosion kinetic measurement, SEM/EDS and XRD. The results show that the three austenitic stainless steels show mass loss during the hot corrosion process, their corrosion resistance may be ranked as follows: 254SMo stainless steel ＞904L stainless steel ＞317L stainless steel, whilst their mass loss increases with the increase of temperature and time. The addition of Mo can alleviate the corrosion of the steels in the chloride salt. Serious intergranular corrosion occurred in the three austenitic stainless steels at 850 and 950 ℃. The hot corrosion reaction follows the so called “active oxidation” mechanism, and the generated chlorine gas will participate in the reaction cycle.

Key words: austenitic stainless steel hot corrosion corrosion kinetics chlorination

Received: 19 April 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52071227);Shanxi Province Platform Base Construction Project(2018D121003);the Central Leading Local Science and Technology Development Special Project(YDZX20191400002094);Shanxi Province Science and Technology Major Project(20191102006)

Corresponding Authors: WEI Yinghui E-mail: yhwei_tyut@126.com

About author: WEI Yinghui, E-mail: yhwei_tyut@126.com

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	Pu YI
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	Wei ZHANG
	Fanghong XU
	Yinghui WEI

Cite this article:

YI Pu, HOU Lifeng, DU Huayun, LIU Xiaoda, JIA Jianwen, LI Yang, ZHANG Wei, XU Fanghong, WEI Yinghui. NaCl Induced Corrosion of Three Austenitic Stainless Steels at High Temperature. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 288-294.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.086 OR https://www.jcscp.org/EN/Y2022/V42/I2/288

Table 1 Compositions of three austenitic stainless steels used in the experiments (mass fraction / %)

Fig.1 Mass losses of 254SMo, 904L and 317L stainless steels during hot corrosion at 750 ℃ (a), 850 ℃ (b) and 950 ℃ (c)

Fig.2 Total mass losses of three stainless steels after 60 h hot corrosion at different temperatures

Fig.3 XRD patterns of 254SMo (a), 904L (b) and 317L (c) stainless steels before and after hot corrosion for 60 h at different temperatures

Fig.4 SEM images of 254SMo (a~c), 904L (b~f) and 317L (g~i) stainless steels after hot corrosion at 750 ℃ (a, d, g), 850 ℃ (b, e, h) and 950 ℃ (c, f, i) for 60 h

Fig.5 SEM surface images of 254SMo (a), 904L (b) and 317L (c) stainless steels after hot corrosion at 850 ℃ in NaCl and corresponding EDS analysis results of the marked areas

Fig.6 Cross-sectional morphologies of 254SMo (a~c), 904L (b~f) and 317L (g~i) stainless steels after hot corrosion at 750 ℃ (a, d, g), 850 ℃ (b, e, h) and 950 ℃ (c, f, i) for 60 h

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