Corrosion Behavior of Austenitic Stainless Steel with Different Cr Contents in 700oC Coal Ash/High Sulfur Flue-Gas Environment

doi:10.11900/0412.1961.2020.00496

Acta Metall Sin

2022, Vol. 58

Issue (1): 67-74 DOI: 10.11900/0412.1961.2020.00496

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Corrosion Behavior of Austenitic Stainless Steel with Different Cr Contents in 700^oC Coal Ash/High Sulfur Flue-Gas Environment

CAO Chao¹, JIANG Chengyang¹(

), LU Jintao²(

), CHEN Minghui¹, GENG Shujiang¹, WANG Fuhui¹

^1. Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
^2. National Energy R&D Center of Clean and High-Efficiency Fossil-Fired Power Generation Technology, Xi'an Thermal Power Research Institute Co. , Ltd. , Xi'an 710032, China

Cite this article:

CAO Chao, JIANG Chengyang, LU Jintao, CHEN Minghui, GENG Shujiang, WANG Fuhui. Corrosion Behavior of Austenitic Stainless Steel with Different Cr Contents in 700^oC Coal Ash/High Sulfur Flue-Gas Environment. Acta Metall Sin, 2022, 58(1): 67-74.

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Abstract

With the rapid increase in thermal power generation units in China, the thermal power generation industry is facing pressures such as reducing costs, improving power generation efficiency and mitigating environmental problems. Thermal power generation units with a large capacity and high parameters result in high system efficiency, but they also amplify the corrosion failure problem of high-temperature components, especially the atmosphere/ash corrosion of outer tubes. Many studies regarding flue gas corrosion have shown that molten alkali metal sulfate can form on the surface of pipelines, causing severe corrosion damage, and the extent of corrosion is closely related to the sulfur content in raw coal. However, much attention has been paid to low-sulfur (standard coal combustion) environments in previous studies, with very few studies on high-sulfur environments. Austenitic stainless steels possessing a combination of excellent high temperature corrosion and fatigue resistances, are considered as promising construction materials for high temperature components in supercritical and ultra-supercritical fossil fuel power plants. Elements such as Cr and Nb have been shown to greatly affect the high temperature corrosion resistance of austenitic stainless steels; however few reports are available regarding the effect of Cr on corrosion resistance in high-sulfur flue gas environments and the effect of Nb on the corrosion resistance of Cr₂O₃-forming alloys. Therefore, in this study, the corrosion behavior of three types of austenitic stainless steels with different Cr contents was studied in a coal ash/high-sulfur flue gas environment at 700^oC. Results showed that low Cr alloys formed a two-layered structure: an external Fe₂O₃ layer and an internal layer with Cr₂O₃ and CrS. Medium Cr alloys developed a similar structure oxide scale to low Cr concentration alloys, but the corrosion extent was modest. Conversely, a stable and dense Cr₂O₃ layer was formed on the surface of the high Cr alloys, showing higher corrosion resistance than the other two alloys. The Nb in the alloys had some influence on the corrosion resistance of the alloys. The NbC in the alloys oxidized to Nb₂O₅ and distributed in the oxide scale. The formation of Nb₂O₅ destroyed the integrity of the oxide scale and led to the easy cracking of the oxide scale.

Key words: high temperature corrosion austenitic stainless steel coal-ash/high sulfur flue-gas sulfidation/oxidation

Received: 08 December 2020

ZTFLH:

TG174.44

Fund: National Key Research and Development Program of China(2019YFF0217500);Excellent Youth Foundation of Liaoning Province(2019-YQ-03);Science and Technology Project of China Huaneng Group(HNKJ20-H43)

About author: LU Jintao, senior engineer, Tel: 18192269998, E-mail: lujintao@tpri.com.cn
JIANG Chengyang, Tel: 18069221160, E-mail: jiangchengyang@mail.neu.edu.cn

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	Chao CAO
	Chengyang JIANG
	Jintao LU
	Minghui CHEN
	Shujiang GENG
	Fuhui WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00496 OR https://www.ams.org.cn/EN/Y2022/V58/I1/67

Table 1 Chemical compositions of three samples

Fig.1 Schematic of corrosion experiment setup in simulative coal ash/flue-gas environment

Fig.2 Mass change curves of the three test samples after corrosion at 700^oC for 1000 h

Fig.3 XRD spectra of the three test samples after corrosion at 700^oC for 1000 h

Fig.4 The surface morphologies and corresponding magnified images (insets) of the three test samples after corrosion at 700^oC for 1000 h
(a) low Cr alloy
(b) medium Cr alloy
(c) high Cr alloy

Fig.5 The cross-sectional morphologies of the three test samples after corrosion at 700^oC for 1000 h
(a) low Cr alloy (b) medium Cr alloy (c) high Cr alloy

Fig.6 Back-scattered electron image (BEI) and elemental mapping for low Cr alloy after corrosion at 700^oC for 1000 h

Fig.7 BEI and elemental mapping for medium Cr alloy after corrosion at 700^oC for 1000 h

Fig.8 BEI and elemental mapping for high Cr alloy after corrosion at 700^oC for 1000 h

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