Effect of Coating Process Temperatures on Hot Corrosion Behavior Induced by Deposit of Sulfates Salts in Air at 750oC for CVD Aluminized Coatings on K452 Superalloy

doi:10.11902/1005.4537.2023.182

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 612-622 DOI: 10.11902/1005.4537.2023.182

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Effect of Coating Process Temperatures on Hot Corrosion Behavior Induced by Deposit of Sulfates Salts in Air at 750^oC for CVD Aluminized Coatings on K452 Superalloy

XU Jiaxin¹, GENG Shujiang¹(

), WANG Jinlong¹, WANG Fuhui¹, SUN Qingyun², WU Yong², XIA Siyao²

1. Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
2. China Academy of Machinery Wuhan Research Institute of Materials Protection Co., Ltd., Wuhan 430030, China

Cite this article:

XU Jiaxin, GENG Shujiang, WANG Jinlong, WANG Fuhui, SUN Qingyun, WU Yong, XIA Siyao. Effect of Coating Process Temperatures on Hot Corrosion Behavior Induced by Deposit of Sulfates Salts in Air at 750^oC for CVD Aluminized Coatings on K452 Superalloy. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 612-622.

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Abstract

Aluminized coatings were deposited on K452 superalloy by chemical vapor deposition (CVD) technique at the temperatures 850, 950 and 1050^oC, respectively. The effect of deposition temperature on the corrosion behavior of K452 alloys without and with CVD aluminized coatings was comparatively investigated beneath deposits of Na₂SO₄ and Na₂SO₄ + NaCl (3 ± 0.2 mg/cm²), respectively in air at 750^oC. Then their cross-sectional morphologies and phase structures were characterized by SEM/EDS and XRD. The results showed that all the aluminized coatings exhibited better corrosion resistance to the deposits of Na₂SO₄ and Na₂SO₄ + NaCl as compared to the bare K452 alloy after 50 h of corrosion. Notably, the corrosion resistance of the coatings was increased with the increase in deposition temperatures.

Key words: CVD aluminized coatings deposition temperature Na₂SO₄-induced corrosion Na₂SO₄ + NaCl-induced corrosion

Received: 01 June 2023 32134.14.1005.4537.2023.182

ZTFLH:

TG174

Fund: National Key R&D Program of China(2020YFB2010400);Hubei Provincial Key Research and Development Program of China(2021BAA210)

Corresponding Authors: GENG Shujiang, E-mail: gengsj@smm.neu.edu.cn

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	XU Jiaxin
	GENG Shujiang
	WANG Jinlong
	WANG Fuhui
	SUN Qingyun
	WU Yong
	XIA Siyao

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.182 OR https://www.jcscp.org/EN/Y2024/V44/I3/612

Fig.1 XRD patterns of three aluminized coatings

Fig.2 Cross-sectional morphologies and corresponding EDS element mappings of aluminized coatings prepared at 850^oC (a), 950^oC (b) and 1050^oC (c)

Fig.3 Corrosion kinetics of K452 alloy and three aluminized coatings during hot corrosion of Na₂SO₄ deposition in air at 750^oC

Fig.4 Cross-sectional morphologies and corresponding EDS element mappings of K452 alloy (a) and three aluminized coatings prepared at 850^oC (b), 950^oC (c) and 1050^oC (d) after hot corrosion of Na₂SO₄ deposition for 50 h in air at 750^oC

Fig.5 XRD patterns of K452 alloy and three aluminized coatings after hot corrosion of Na₂SO₄ deposition for 50 h in air at 750^oC

Fig.6 Corrosion kinetics of K452 alloy and three aluminized coatings during hot corrosion of (Na₂SO₄ + NaCl) deposition in air at 750^oC

Fig.7 Cross-sectional morphologies and corresponding EDS element mappings of K452 alloy (a) and three aluminized coatings prepared at 850^oC (b), 950^oC (c) and 1050^oC (d) after hot corrosion of (Na₂SO₄ + NaCl) deposition for 50 h in air at 750^oC

Fig.8 XRD patterns of K452 alloy and three aluminized coatings after hot corrosion of (Na₂SO₄ + NaCl) deposition for 50 h in air at 750^oC

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