Hot Corrosion Behavior of New Type Co-Al-W Superalloys with Different Ni Contents

doi:10.11902/1005.4537.2023.323

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (6): 1419-1426 DOI: 10.11902/1005.4537.2023.323

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Hot Corrosion Behavior of New Type Co-Al-W Superalloys with Different Ni Contents

WANG Hua¹, WANG Yingjie², LIU Enze²^,³(

)

^1.Department of Naval Equipment, Xi'an 710021, China
^2.School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China
^3.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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WANG Hua, WANG Yingjie, LIU Enze. Hot Corrosion Behavior of New Type Co-Al-W Superalloys with Different Ni Contents. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1419-1426.

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Abstract

The hot corrosion behavior of Co-based alloys Co-9Al-9.5W-xNi (x=5, 15, 20, atomic fraction, %) beneath a film of molten salts mixture of 75% Na₂SO₄+25% NaCl in air at 900 °C were investigated by means of mass change measurement, SEM with EDS and XRD. The focus of the research is on the influence of Ni on hot corrosion resistance of the alloy Co-9Al-9.5W and the morphology and composition of the formed corrosion products. The results showed that the hot corrosion of the alloys may be characterized by both sulfidation and oxidation; with the increase of Ni content, the hot corrosion resistance of the alloy could be notably improved. The corrosion products scales on the three Co-based alloys were most composed of NiO, CoO, Al₂S₃ and CoNiO₂. Finally, the hot corrosion mechanism of the Co-based alloy in the presence of 75% Na₂SO₄ and 25% NaCl deposits is also discussed.

Key words: Co-Al-W alloys hot corrosion Ni hot corrosion mechanism

Received: 10 October 2023 32134.14.1005.4537.2023.323

ZTFLH:

TG174

Fund: National Key R&D Program of China(2021YFC2202402);National Natural Science Foundation of China(51471079)

Corresponding Authors: LIU Enze, E-mail: nzliu@imr.ac.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.323 OR https://www.jcscp.org/EN/Y2023/V43/I6/1419

Fig.1 Microstructure of Co-9Al-9.5W-20Ni alloy after standard heat treatment

Fig.2 Corrosion kinetics of three Co-Al-W-xNi superalloys at 900 ℃ in 75% Na₂SO₄+25% NaCl molten salt

Fig.3 XRD patterns of corrosion products formed on three Co-Al-W-xNi superalloys after hot corrosion at 900 ℃ in 75% Na₂SO₄+25% NaCl molten salt for 2 (a), 16 (b) and 32 h (c)

Fig.4 SEM surface morphologies of three alloys A (a-d), B (e-h) and C (i-l) after hot corrosion in 75% Na₂SO₄+25% NaCl molten salt at 900 °C for 2 h (a, b, e, f, i, j) and 32 h (c, d, g, h, k, l)

Fig.5 Cross-sectional micrographs of alloys A (a), B (b) and C (c) after hot corrosion in Na₂SO₄ and NaCl molten salt at 900 °C for 32 h

Fig.6 SEM morphology of the alloy A after hot corrosion in 75% Na₂SO₄+25% NaCl at 900 °C for 32 h (a), and EDS mappings of Al (b), Co (c), Ni (d), O (e), S (f) and W (g)

Fig.7 SEM morphology of the alloy B exposed to 75% Na₂SO₄+25% NaCl at 900 °C for 32 h (a), and EDS mappings of Al (b), Co (c), Ni (d), O (e), S (f) and W (g)

Fig.8 SEM morphology of the alloy C exposed to 75% Na₂SO₄+25% NaCl at 900 °C for 32 h (a), and EDS mappings of Al (b), Co (c), Ni (d), O (e), S (f) and W (g)

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