Corrosion Behavior of GH4169 Alloy in NaCl Solution Spray Environment at 600oC

doi:10.11900/0412.1961.2022.00204

Acta Metall Sin

2023, Vol. 59

Issue (11): 1475-1486 DOI: 10.11900/0412.1961.2022.00204

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Corrosion Behavior of GH4169 Alloy in NaCl Solution Spray Environment at 600^oC

ZHANG Weidong¹, CUI Yu²(

), LIU Li¹(

), WANG Wenquan¹, LIU Rui¹, LI Rui¹, WANG Fuhui¹

^1.Shenyang National Laboratory for Materials Science, 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 Wenquan, LIU Rui, LI Rui, WANG Fuhui. Corrosion Behavior of GH4169 Alloy in NaCl Solution Spray Environment at 600^oC. Acta Metall Sin, 2023, 59(11): 1475-1486.

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Abstract

The corrosion behavior of engine materials of airplanes working in marine environments is accelerated by the synergistic effects of NaCl particles and water vapor at high temperatures. This work examined the corrosion behavior of GH4169 alloy with a NaCl solution spraying at 600^oC using an oxidation kinetics test and micro characterization technology in the aspects of corrosion kinetics, corrosion layer phase composition, and microstructure. The weight gain of the GH4169 alloy corroded in the NaCl solution spraying environment was much lower than that in solid NaCl + wet O₂ after 20 h corrosion at 600^oC. The corrosion products of the GH4169 alloy in the NaCl solution spray environment were less complex than those in the solid NaCl + wet O₂ environment, but they were denser. In addition, Cl was concentrated in the inner layer of the corrosion products and accelerated the corrosion of GH4169 alloy via an “active oxidation” mechanism at the initial stage. When NaCl deposition was increased, the corrosion mechanism of GH4169 alloy changed gradually to Cl-induced “active oxidation.” The sensitivity of GH4169 alloy in the NaCl solution spray environment at 600^oC was analyzed. Overall, the sensitivity of elements in GH4169 alloy to chlorine activated corrosion was Ti > Al > Nb, Cr > Fe > Mo, Ni, whereas the sensitivity of the oxides was TiO₂ > MoO₂ > Cr₂O₃(Nb₂O₅) > Fe₂O₃ > Al₂O₃ > NiO.

Key words: GH4169 alloy NaCl solution spray sensitivity of alloy element

Received: 29 April 2022

ZTFLH:

TG174

Fund: Key Projects of Enterprise Innovation Joint Fund of National Natural Science Fundation of China(U20B2026)

Corresponding Authors: LIU Li, professor, Tel: 15904072057, E-mail: liuli@mail.neu.edu.cn;
CUI Yu, associate researcher, Tel: 15004059681, E-mail: ycui@imr.ac.cn

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	ZHANG Weidong
	CUI Yu
	LIU Li
	WANG Wenquan
	LIU Rui
	LI Rui
	WANG Fuhui

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00204 OR https://www.ams.org.cn/EN/Y2023/V59/I11/1475

Fig.1 Schematics of NaCl solution spray environment (a) and the furnace system with the traditional solid NaCl in wet O₂ environment (b)

Fig.2 Mass gain curves of GH4169 exposed in pure O₂, wet O₂, solid NaCl in wet O₂, and NaCl solution spray_{environments at 600^oC for 20 h}

Fig.3 SEM images of GH4169 alloy exposed in solid NaCl in wet O₂ (a) and NaCl solution spray (b) environments at 600^oC for 5 min

Fig.4 SEM images of GH4169 alloy exposed in pure O₂ (a), wet O₂ (b), solid NaCl in wet O₂ (c), and NaCl solution spray (d) environments at 600^oC for 20 h (Insets show the corresponding high magnified images)

Table 1 EDS results of the points in Fig.4

Fig.5 Cross-section SEM images of GH4169 alloy exposed in pure O₂ (a), wet O₂ (b), solid NaCl in wet O₂ (c), and NaCl solution spray (d) environments at 600^oC for 20 h

Fig.6 XRD spectra of GH4169 alloy exposed in pure O₂, wet O₂, solid NaCl in wet O₂, and NaCl solution spray environments at 600^oC for 20 h

Fig.7 EPMA maps of the elemental distribution of the cross-section of GH4169 alloy exposed in solid NaCl in wet O₂ (a) and NaCl solution spray (b) environments at 600^oC for 20 h

Fig.8 EPMA maps of the elemental distribution of the cross-section of GH4169 alloy exposed in NaCl solution spray environment at 600^oC for 100 h

Fig.9 TEM image and corresponding SAED patterns of the corrosion scale of GH4169 alloy exposed in NaCl solution spray at 600^oC for 20 h (a), and Cl element distribution along the EDS-line in Fig.9a (b)

Fig.10 TEM image of internal corrosion scale of GH4169 alloy exposed in solid NaCl in wet O₂ environment at 600^oC for 20 h (a), and corresponding high magnified images of areas 1 (b) and 2 (c) in Fig.10a, respectively, and STEM-EDS result of Fig.10b (d)

Table 2 Standard Gibbs free energies (ΔG⁰) of reactions at 600^oC (calculated by HSC Chemistry 5.11 database)

Fig.11 Equilibrium diagram of M-Cl-O system at 600^oC with lgp $O 2$ _{and lgp_Cl as coordinates (calculated by HSC Chemistry 5.11 database. p $O 2$ —oxygen partial pressure, p_Cl—chlorine partial pressure)}

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