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Journal of Chinese Society for Corrosion and protection  2019, Vol. 39 Issue (2): 96-105    DOI: 10.11902/1005.4537.2018.188
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Enhancement of High Temperature Oxidation Resistance of Ti48Al5Nb Alloy via Anodic Anodization in NH4F Containing Ethylene Glycol
Junjie XIA1,Hongzhi NIU2,Min LIU3,Huazhen CAO1,Guoqu ZHENG1,Liankui WU1()
1. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
2. College of Materials Science and Engineering, Northeast University, Shenyang 110819, China
3. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China
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Abstract  

Ti48Al5Nb alloy was electrochemically anodized in electrolyte of ethylene glycol with NH4F to prepare anodic films containing fluorine and aluminum. The influence of anodization treatment on the oxidation behavior, the composition and structure of the oxide scale of the anodized Ti48Al5Nb alloy were then characterized. Results shown that a continuous and dense Al2O3 oxide scale will generate on the anodized Ti48Al5Nb alloy after high temperature oxidation. And this oxide scale has good adhesion with the substrate, therefore can efficiently prevent the inward diffusion of oxygen, resulting the enhanced high temperature oxidation resistance. After oxidation at 1000 ℃ for 100 h, the weight gain of the anodized Ti48Al5Nb alloy was dramatically decreased from 26.73 mg·cm-2 for the bare Ti48Al5Nb alloy to 1.18 mg·cm-2. Moreover, it is shown that anodization also changes the oxidation mechanism, leading to the disappearance of the Nb-enriched layer at the interface between the oxide scale and substrate. The enhanced high temperature oxidation of the anodized Ti48Al5Nb is derived from the halogen effect based on the fluorine compounds existed in the anodized film.

Key words:  TiAl alloy      anodization      halogen effect      high temperature oxidation     
Received:  27 December 2018     
ZTFLH:  TG174.4  
Fund: Supported by National Natural Science Foundation of China(51501163);Supported by National Natural Science Foundation of China(51301140);Natural Science Foundation of Zhejiang Province(LY18E010005);Talent Project of Zhejiang Association for Science and Technology(2017YCGC015)
Corresponding Authors:  Liankui WU     E-mail:  lkwu@zjut.edu.cn

Cite this article: 

Junjie XIA,Hongzhi NIU,Min LIU,Huazhen CAO,Guoqu ZHENG,Liankui WU. Enhancement of High Temperature Oxidation Resistance of Ti48Al5Nb Alloy via Anodic Anodization in NH4F Containing Ethylene Glycol. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 96-105.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2018.188     OR     https://www.jcscp.org/EN/Y2019/V39/I2/96

Fig.1  Top-surface SEM images of Ti48Al5Nb alloy before (a, e) and after anodizing for 1 h at 10 V (b, f), 20 V (c, g), and 30 V (d, h) and EDS results of constituent elements in the points marked in Fig.1a~d (i~l), respectively
Fig.2  Survey (a) and refined XPS spectra of Ti 2p (b), Al 2p (c), Nb 3d (d), F 1s (e) and O 1s (f) for Ti48Al5Nb alloy anodized at 30 V for 1 h
Fig.3  Oxidation kinetics of bare and anodized Ti45Al5Nb alloy at 1000 °C in air (the insets show the optical images of the specimens after oxidation for 100 h)
Fig.4  XRD patterns of Ti48Al5Nb alloy without (a) and with anodizing at 10 V (b), 20 V (c) and 30 V (d) after oxidation at 1000 °C for 100 h
Fig.5  Top-surface SEM images of Ti48Al5Nb alloy without (a) and with anodizing at 10 V (b~d), 20 V (e, f ) and 30 V (g, h) after oxidation at 1000 °C for 100 h
Fig.6  Top-surface SEM images of Ti48Al5Nb alloy pre-anodized at 30 V for 1 h after oxidation at 1000 ℃ for 1 h (a, b) and 3 h (c, d)
Fig.7  Cross-sectional SEM image of flat (a) and pit (c) areas of Ti48Al5Nb alloy after oxidation at 1000 ℃ for 100 h and corresponding element distribution mappings of Al, Ti, Nb and O in the zones marked in Fig.7a (b) and Fig.7c (d), respectively
Fig.8  Cross-sectional SEM image of Ti48Al5Nb alloy with pre-anodizing at 10 V after oxidation at 1000 ℃ for 100 h (a), corresponding element depth profiles along the marked line (b), and distribution mappings of Al, Ti, Nb and O in the marked rectangle zone (c)
Fig.9  Cross-sectional SEM image of Ti48Al5Nb alloy with anodizing at 30 V after oxidation at 1000 ℃ for 100 h (a), corresponding elements depth profiles along the marked line (b), and distribution mappings of Al, Ti, Nb and O in the marked rectangle zone (c)
Fig.10  Survey (a) and refined XPS spectra of Ti 2p (b), Al 2p (c), Nb 3d (d), and O 1s (e) for Ti48Al5Nb alloy with anodizing at 30 V after oxidation at 1000 ℃ for 100 h
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