基于卤素效应的阳极氧化技术提高Ti48Al5Nb合金抗高温氧化性能

doi:10.11902/1005.4537.2018.188

中国腐蚀与防护学报

2019, Vol. 39

Issue (2): 96-105 DOI: 10.11902/1005.4537.2018.188

研究报告

本期目录 | 过刊浏览

基于卤素效应的阳极氧化技术提高Ti48Al5Nb合金抗高温氧化性能

夏俊捷¹,牛红志²,刘敏³,曹华珍¹,郑国渠¹,伍廉奎¹(

)

1. 浙江工业大学材料科学与工程学院杭州 310014
2. 东北大学材料科学与工程学院沈阳 110819
3. 国网浙江省电力有限公司电力科学研究院杭州 310014

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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摘要:

采用电化学阳极氧化技术在含NH₄F的乙二醇电解液中对Ti48Al5Nb合金进行阳极氧化处理，以获得富铝含氟阳极氧化膜。研究了阳极氧化处理对Ti48Al5Nb合金在1000 ℃空气中的氧化行为及氧化膜组成和结构的影响。结果表明：阳极氧化处理的Ti48Al5Nb合金经高温氧化后表面可形成连续、致密的Al₂O₃氧化膜，且氧化膜与基体具有良好结合力，有效阻止了氧向内扩散，进而显著提高了合金的抗高温氧化性能。经1000 ℃氧化100 h后，阳极氧化试样增重由未经阳极氧化处理试样的26.73 mg/cm²降至1.18 mg/cm²。同时，阳极氧化处理改变了合金的氧化机制，抑制了氧化膜/基体界面处富Nb层的出现。阳极氧化提高Ti48Al5Nb合金抗高温氧化性能是由于氧化膜中F在高温氧化过程中表现出的“卤素效应”所致。

关键词 ：钛铝合金, 阳极氧化, 卤素效应, 抗高温氧化

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

收稿日期: 2018-12-27

ZTFLH:

TG174.4

基金资助:国家自然科学基金(51501163);国家自然科学基金(51301140);浙江省自然科学基金(LY18E010005);浙江省科协“育才工程”培养计划(2017YCGC015)

通讯作者: 伍廉奎 E-mail: lkwu@zjut.edu.cn

Corresponding author: Liankui WU E-mail: lkwu@zjut.edu.cn

作者简介: 夏俊捷，男，1993年生，硕士生

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引用本文:

夏俊捷,牛红志,刘敏,曹华珍,郑国渠,伍廉奎. 基于卤素效应的阳极氧化技术提高Ti48Al5Nb合金抗高温氧化性能[J]. 中国腐蚀与防护学报, 2019, 39(2): 96-105.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.188 或 https://www.jcscp.org/CN/Y2019/V39/I2/96

图1 Ti48Al5Nb合金和阳极氧化Ti48Al5Nb合金表面微观形貌及EDS结果

图2 Ti48Al5Nb合金经阳极氧化后表面XPS谱

图3 未经和经过阳极氧化预处理的Ti48Al5Nb合金在1000 ℃下的氧化动力学曲线

图4 Ti48Al5Nb合金和阳极氧化Ti48Al5Nb合金经1000 °C氧化100 h后的XRD谱

图5 未经和经过阳极氧化预处理的Ti48Al5Nb合金在1000 ℃下氧化100 h后的表面微观形貌

图6 30 V电压下阳极氧化的Ti48Al5Nb合金在1000 ℃下氧化不同时间后的表面微观形貌

图7 Ti48Al5Nb合金经1000 ℃氧化100 h后的截面微观形貌及相应的EDS面扫描结果

图8 10 V电压下阳极氧化的Ti48Al5Nb合金经1000 ℃氧化100 h后的截面微观形貌及相应的EDS线扫描和面扫描结果

图9 30 V电压下阳极氧化的Ti48Al5Nb合金经1000 ℃氧化100 h后的截面微观形貌及相应的EDS线扫描和面扫描结果

图10 30 V电压下阳极氧化的Ti48Al5Nb合金经1000 ℃氧化100 h后的XPS谱

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