Corrosion Behavior of Pre-oxidized GH4169 Alloy Beneath Solid NaCl Deposit Film in Wet Oxygen Flow at 600 oC

doi:10.11902/1005.4537.2024.166

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (1): 182-190 DOI: 10.11902/1005.4537.2024.166

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Corrosion Behavior of Pre-oxidized GH4169 Alloy Beneath Solid NaCl Deposit Film in Wet Oxygen Flow at 600 ^oC

ZHANG Weidong¹, CUI Yu²(

), LIU Li¹, WANG Fuhui¹

1 Corrosion and Protection Center, Northeastern University, Shenyang 110819, China
2 Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

ZHANG Weidong, CUI Yu, LIU Li, WANG Fuhui. Corrosion Behavior of Pre-oxidized GH4169 Alloy Beneath Solid NaCl Deposit Film in Wet Oxygen Flow at 600 ^oC. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 182-190.

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Abstract

The corrosion behavior of pre-oxidized GH4169 alloy beneath a solid NaCl deposit film in flowing water vapor containing O₂ at 600 ^oC was investigated by means of oxidation kinetics measurement, scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM) in the aspects of corrosion kinetics, morphology and phase composition of corrosion products. The results indicate that a continuous oxide scale composed mainly of Cr₂O₃/Nb₂O₅ was formed by pre-oxidation of GH4169 alloy in air at 1000 ^oC for 2 h. However, after 5 h corrosion in the above designed conditions, the pre-oxidized GH4169 alloy underwent serious corrosion, while the pre-formed oxide scale was seriously damaged, and the corrosion product scale mainly composed of NiFe₂O₄, NaNbO₃, Na₂CrO₄ and residual Cr₂O₃ was formed. Finally, the corrosion mechanism of the pre-oxidized GH4169 alloy beneath a solid NaCl deposit film in flowing water vapor containing O₂ at 600 ^oC was discussed in detail, in terms of the deterioration process of the pre-oxidation scale.

Key words: pre-oxidation solid NaCl deposit with wet O₂ medium temperature

Received: 27 May 2024 32134.14.1005.4537.2024.166

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(U22A20111)

Corresponding Authors: CUI Yu, E-mail: ycui@imr.ac.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.166 OR https://www.jcscp.org/EN/Y2025/V45/I1/182

Fig.1 SEM surface morphology (a), cross-section morphology (b), and XRD pattern (c) of GH4169 alloy after 10 h oxidation at 900 ^oC

Fig.2 TEM analysis results of the oxides scale formed on GH4169 alloy after 10 h pre-oxidation at 900 ^oC

Fig.3 Corrosion kinetics curves of pre-oxidized GH4169 alloy with solid NaCl deposit in O₂ + H₂O mixed gas at 600 ^oC

Fig.4 Surface morphologies of pre-oxidized GH4169 alloy with solid NaCl deposit after exposure in O₂ + H₂O mixed gas at 600 ^oC for 5 h the pre-oxidation time with 0 h (a), 1 h (b) and 10 h (c)

Fig.5 Cross-sectional morphologies of pre-oxidized GH4169 alloy with solid NaCl deposit after exposure in O₂ + H₂O mixed gas at 600 ^oC for 5 h the pre-oxidation time with 0 h (a), 1 h (b) and 10 h (c)

Fig.6 XRD patterns of pre-oxidized GH4169 alloy with solid NaCl deposit after exposure in O₂ + H₂O mixed gas at 600 ^oC for 5 h

Fig.7 Cross-sectional image and electron diffraction patterns (a) of the oxide scale formed on 10 h pre-oxidized GH4169 alloy with solid NaCl deposit after exposure in O₂ + H₂O at 600 ^oC for 1 h, and depth profile of Cl ions (b)

Fig.8 TEM analysis results of microstruture and phase composition of the oxide scale formed on 10 h pre-oxidized GH4169 alloy with NaCl deposit after exposure in O₂ + H₂O at 600 ^oC for 3 h

Fig.9 TEM analysis results of microstruture and phase composition of the oxide scale formed on 10 h pre-oxidized GH4169 alloy with NaCl deposit after exposure in O₂ + H₂O at 600 ^oC for 5 h

Fig.10 Element mappings of the oxide scale formed on 10 h pre-oxidized GH4169 alloy with solid NaCl deposit after exposure in wet O₂ + H₂O at 600 ^oC for 1 h (a), 3 h (b) and 5 h (c)

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