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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.
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Received: 27 December 2018
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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
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