Hot Corrosion Behavior of Inconel 718 Without and With Aluminide Coating in Air Beneath a Thin Film of Salt Mixture of Na2SO4 + 5%NaCl

doi:10.11902/1005.4537.2023.221

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 623-634 DOI: 10.11902/1005.4537.2023.221

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Hot Corrosion Behavior of Inconel 718 Without and With Aluminide Coating in Air Beneath a Thin Film of Salt Mixture of Na₂SO₄ + 5%NaCl

HU Qi¹, 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:

HU Qi, GENG Shujiang, WANG Jinlong, WANG Fuhui, SUN Qingyun, WU Yong, XIA Siyao. Hot Corrosion Behavior of Inconel 718 Without and With Aluminide Coating in Air Beneath a Thin Film of Salt Mixture of Na₂SO₄ + 5%NaCl. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 623-634.

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Abstract

Aluminide coating was prepared on Inconel 718 superalloy by chemical vapor deposition (CVD). The hot corrosion behavior of Inconel 718 without and with aluminide coating beneath a thin film of salt mixture of Na₂SO₄ (95%) + NaCl (5%) in air at 750, 850 and 950^oC was studied respectively. The results indicate that Inconel 718 alloy shows poor corrosion resistance, and the higher the temperature, the more serious the corrosion. In the early stage of hot corrosion, the surface corrosion products are mainly composed of Cr₂O₃ and Fe₂O₃. As the corrosion time increases, spinel oxide becomes the main corrosion products. In addition, the scale on Inconel 718 alloy formed at 850 and 950^oC is loose and porous, while cracking and peeling were observed. For the aluminide coated alloy, it performs well with enhanced corrosion resistance, while an Al₂O₃ scale is formed on the coating surface during corrosion. Although the coating underwent significant degradation with the increasing corrosion temperature and/or corrosion time. Besides, the formed corrosion scale is not tightly boned to the coating, while the defects such as cracks or voids are observed. Even so, the coating can still protect the substrate effectively to a great extent.

Key words: Inconel 718 CVD aluminide coating Na₂SO₄ + 5%NaCl hot corrosion

Received: 13 July 2023 32134.14.1005.4537.2023.221

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, Email: gengsj@smm.neu.edu.cn

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	HU Qi
	GENG Shujiang
	WANG Jinlong
	WANG Fuhui
	SUN Qingyun
	WU Yong
	XIA Siyao

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.221 OR https://www.jcscp.org/EN/Y2024/V44/I3/623

Fig.1 Surface morphology of as-deposited coating (a), EDS results of the rectangle area 1 and point 1 marked in Fig.1a (b), cross-sectional morphology with corresponding line-scanning results (c), and XRD pattern (d)

Fig.2 Mass change curves of Inconel 718 alloy and CVD aluminide coating deposited with Na₂SO₄ + 5%NaCl during hot corrosion for 50 h in air at 750, 850 and 950℃

Fig.3 Surface morphologies of Inconel 718 alloy (a, c, e) and CVD aluminide coating (b, d, f) deposited with Na₂SO₄ + 5%NaCl after 1 h hot corrosion at 750^oC (a, b), 850^oC (c, d) and 950^oC (e, f)

Table 1 EDS analysis results of the different regions marked in Fig.3

Fig.4 Cross-sectional morphologies of Inconel 718 alloy (a, c, e) and CVD aluminide coating (b, d, f) after 1 h corrosion in Na₂SO₄ + 5%NaCl mixed salt at 750^oC (a, b), 850^oC (c, d) and 950^oC (e, f)

Fig.5 XRD patterns of Inconel 718 alloy (a) and CVD aluminide coating (b) after 1 h corrosion at different temperatures

Fig.6 Surface morphologies of Inconel 718 alloy (a, c, e) and CVD aluminide coating (b, d, f) after 50 h corrosion in Na₂SO₄ + 5%NaCl mixed salt at 750^oC (a, b), 850^oC (c, d) and 950^oC (e, f)

Table 2 EDS analysis results of the different regions marked in Fig.6

Fig.7 Cross-sectional morphologies of Inconel 718 alloy (a, c, e) and CVD aluminide coating (b, d, f) after 50 h corrosion in Na₂SO₄ + 5%NaCl mixed salt at 750^oC (a, b), 850^oC (c, d) and 950^oC (e, f)

Fig.8 XRD patterns of Inconel 718 alloy (a) and CVD aluminide coating (b) after 50 h corrosion at different temperatures

Fig.9 Ellingham-Richardson diagram of oxidation reactions of main alloying elements

Fig.10 Simplified eutectic phase diagram of Na₂SO₄-NaCl system

Fig.11 Ellingham-Richardson diagram of the reactions between main alloying elements and molten Na₂SO₄

Fig.12 Ellingham-Richardson diagram of the reactions between main alloying elements and molten NaCl

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