Influence of Alkali Metal Sulfate- and Chloride-salts Content in Artificial Coal Ash on Corrosion Behavior of HR3C Steels With and Without Aluminizing

doi:10.11902/1005.4537.2024.015

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (6): 1389-1398 DOI: 10.11902/1005.4537.2024.015

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Influence of Alkali Metal Sulfate- and Chloride-salts Content in Artificial Coal Ash on Corrosion Behavior of HR3C Steels With and Without Aluminizing

YU Zheng, CHEN Minghui(

), WANG Jinlong, YANG Shasha, WANG Fuhui

Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

Cite this article:

YU Zheng, CHEN Minghui, WANG Jinlong, YANG Shasha, WANG Fuhui. Influence of Alkali Metal Sulfate- and Chloride-salts Content in Artificial Coal Ash on Corrosion Behavior of HR3C Steels With and Without Aluminizing. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1389-1398.

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Abstract

The corrosion behavior of HR3C steels with and without aluminizing beneath simulated coal ash deposits with varying content of alkali metal sulfate (Na₂SO₄ + K₂SO₄) and chloride (KCl) salts was comparatively studied in a gas mixture of SO₂,O₂, H₂O and CO₂ at 700^oC. The corrosion form of steels is oxidation with internal-sulfidation and -oxidation. When there is no chloride salt in the ash deposits, the corrosion depth of the alloy increases linearly with the mass fraction of Na₂SO₄ + K₂SO₄. However, the aluminized HR3C steel only underwent slight oxidation. When the content of alkali salts remains unchanged, while the content of KCl increases successively to 0.5%, 1% and 2% (mass fraction), the corrosion degree of HR3C is intensified in a jumping manner, but the aluminized ones still maintain good corrosion resistance.

Key words: stainless steel hot corrosion coal ash corrosion fireside corrosion aluminide coating

Received: 11 January 2024 32134.14.1005.4537.2024.015

ZTFLH:

TG172

Fund: Fundamental Research Funds for the Central Universities(N2302018);Ningbo Yuyao City Science and Technology Plan Project, China(2023J03010010)

Corresponding Authors: CHEN Minghui, E-mail: mhchen@mail.neu.edu.cn

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	YU Zheng
	CHEN Minghui
	WANG Jinlong
	YANG Shasha
	WANG Fuhui

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.015 OR https://www.jcscp.org/EN/Y2024/V44/I6/1389

Table 1 Composition of simulated coal ash

Fig.1 Surface (a) and cross-sectional (b) morphologies of A-HR3C, surface morphology of HR3C (c), and corresponding XRD patterns of A-HR3C and HR3C surface (d)

Fig.2 Macro photos of HR3C (a-f) and A-HR3C (g-l) corroded in 1# (a, g), 2# (b, h), 3# (c, i), 4# (d, j), 5# (e, k) and 6# (f, l) coal ash for 1000 h

Fig.3 Mass change curves of HR3C (a) and A-HR3C (b) after corrosion in simulated coal ash at 700^oC for 1000 h

Fig.4 XRD patterns of HR3C after corrosion in simulated coal ash at 700^oC for 1000 h

Fig.5 Surface morphologies of HR3C alloy after corrosion in different coal ash for 1000 h: (a) 1#, (b) 2#, (c) 3#, (d) 4#, (e) 5#, (f) 6#

Fig.6 Cross-sectional morphologies of HR3C alloy after corrosion in different coal ash for 1000 h: (a) 1#, (b) 2#, (c) 3#, (d) 4#, (e) 5#, (f) 6#

Table 2 Element analysis of different regions in Fig. 5

Fig.7 Thickness of the corrosion zone of HR3C after corrosion in 1-6# coal ash for 1000 h

Fig.8 XRD patterns of A-HR3C after corrosion in simulated coal ash at 700^oC for 1000 h

Fig.9 Surface morphologies of A-HR3C alloy after corrosion in different coal ash for 1000 h: (a) 1#, (b) 2#, (c) 3#, (d) 4#, (e) 5#, (f) 6#

Fig.10 Cross-sectional morphologies of A-HR3C alloy after corrosion in different coal ash for 1000 h: (a) 1#, (b) 2#, (c) 3#, (d) 4#, (e) 5#, (f) 6#

Table 3 Element analysis of different regions in Fig. 9

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