High-temperature Oxidation Behavior of Liquid-phase Fluorination Treated Ti45Al8.5Nb Alloy

doi:10.11902/1005.4537.2025.040

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (6): 1517-1527 DOI: 10.11902/1005.4537.2025.040

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High-temperature Oxidation Behavior of Liquid-phase Fluorination Treated Ti45Al8.5Nb Alloy

ZHUANG Zhaotao, YAN Haojie, XIE Bing, GUI Ye, SUN Qingqing, WU Liankui(

), CAO Fahe

School of Materials, Sun Yat-sen University, Shenzhen 518107, China

Cite this article:

ZHUANG Zhaotao, YAN Haojie, XIE Bing, GUI Ye, SUN Qingqing, WU Liankui, CAO Fahe. High-temperature Oxidation Behavior of Liquid-phase Fluorination Treated Ti45Al8.5Nb Alloy. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1517-1527.

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Abstract

As an emerging lightweight, high-temperature structural material, TiAl alloy holds broad application prospects in the aerospace field. However, its insufficient oxidation resistance limits its further application. In this study, a novel solvothermal liquid-phase fluorination treatment technique was applied to introduce a fluorinated layer on the surface of Ti45Al8.5Nb alloy, in order to promote the in-situ growth of a dense Al₂O₃ oxide layer on the alloy surface, thereby enhancing its high-temperature oxidation resistance. The oxidation behavior, as well as the composition and structure of the oxide layer, of the Ti45Al8.5Nb alloy after liquid-phase fluorination treatment were investigated in air at 900 ^oC. The results indicated that the liquid-phase fluorination treatment can significantly reduce the oxidation rate of the Ti45Al8.5Nb alloy. After oxidation at 900 ^oC for 100 h, the weight gain of the fluorinated alloy decreased from 1.12 mg·cm^-2 (for untreated ones) to 0.45 mg·cm^-2. The treatment facilitated the formation of a continuous and protective dense scale Al₂O₃ on the alloy surface, effectively suppressing the inward diffusion of oxygen and thereby significantly enhancing the alloy's high-temperature oxidation resistance.

Key words: TiAl alloy liquid-phase fluorination treatment fluoridation effect high-temperature oxidation resistance

Received: 04 February 2025 32134.14.1005.4537.2025.040

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52271084);Natural Science Foundation of Guangdong Province(2021B1515020056);Songshan Lake Materials Laboratory Development Project(2022SLABFK06)

Corresponding Authors: WU Liankui, E-mail: wulk5@mail.sysu.edu.cn

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	ZHUANG Zhaotao
	YAN Haojie
	XIE Bing
	GUI Ye
	SUN Qingqing
	WU Liankui
	CAO Fahe

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.040 OR https://www.jcscp.org/EN/Y2025/V45/I6/1517

Fig.1 Schematic diagrams of the liquid-phase fluorination process

Fig.2 Surface morphologies of Ti45Al8.5Nb alloy after liquid-phase fluorination in NH₄F-ethylene glycol solutions containing 0% (a), 1% (b), 3% (c) and 5% (d) H₂O

Table 1 Chemical compositions of the marked points in Fig.2

Fig.3 XPS full spectrum (a) and high-resolution spectra of Ti 2p (b), Al 2p (c), Nb 3d (d), O 1s (e), and F 1s (f) for Ti45Al8.5Nb alloy after liquid-phase fluorination in anhydrous NH₄F-ethylene glycol solution

Fig.4 XPS full spectrum (a) and high-resolution spectra of Ti 2p (b), Al 2p (c), Nb 3d (d), O 1s (e), and F 1s (f) for Ti45Al8.5Nb alloy after liquid-phase fluorination in NH₄F-ethylene glycol solution containing 3%H₂O

Fig.5 Oxidation kinetics curves at 900 ^oC for Ti45-Al8.5Nb alloy untreated and pre-fluorinated in NH₄F-ethylene glycol solutions containing 0%, 1%, 3%, 5% H₂O

Fig.6 XPS full spectrum (a) and high-resolution spectra of Ti 2p (b), Al 2p (c), Nb 3d (d), O 1s (e), and F 1s (f) for Ti45Al8.5Nb alloy pre-fluorinated in anhydrous NH₄F-ethylene glycol solution after oxidation at 900 ^oC for 100 h

Fig.7 XPS full spectrum (a) and high-resolution spectra of Ti 2p (b), Al 2p (c), Nb 3d (d), O 1s (e), and F 1s (f) for Ti45Al8.5Nb alloy pre-fluorinated in NH₄F-ethylene glycol solution containing 3%H₂O after oxidation at 900 ^oC for 100 h

Fig.8 XRD patterns of Ti45Al8.5Nb alloy untreated (a) and pre-fluorinated in NH₄F-ethylene glycol solutions containing 0% (b), 1% (c), 3% (d) and 5% (e) H₂O after oxidation at 900 ^oC for 100 h

Fig.9 Surface morphologies of Ti45Al8.5Nb alloy untreated (a) and pre-fluorinated in NH₄F-ethylene glycol solutions containing 0% (b), 1% (c), 3% (d), 5% (e) H₂O after oxidation at 900 ^oC for 100 h

Table 2 Chemical compositions of the marked points in Fig.9

Fig.10 Cross-sectional BSE images, corresponding EDS elements mappings and line scannings of Ti45Al8.5Nb alloy untreated (a-c) and pre-fluorinated in NH₄F-ethylene glycol solutions containing 0% (d-f) and 3% (g-i) H₂O after oxidation at 900 ^oC for 100 h

Table 3 Chemical compositions of the marked points in Fig.10

Fig.11 Schematic diagrams of the mechanism of liquid-phase fluorination

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