首页|阳极氧化和预氧化提高渗铝TiAl合金的热腐蚀性能

阳极氧化和预氧化提高渗铝TiAl合金的热腐蚀性能

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为提高TiAl合金的抗热腐蚀性能,采用渗铝、阳极氧化和预氧化技术在TiAl合金表面制备致密的防护涂层.研究700°C下涂层保护的TiAl合金在75％Na2SO4+25％NaCl(质量分数)熔盐环境中的热腐蚀行为.结果表明,阳极氧化和预氧化可促进Al2O3防护层的形成,有效阻止热腐蚀环境下熔融盐和氧气向基体的扩散.在热腐蚀过程中,渗铝层为致密Al2O3层的持续形成提供铝元素.另外,预氧化后渗铝层中形成由TiAl3和TiAl2组成的梯度扩散层,降低涂层内部的应力.
Improving hot corrosion resistance of aluminized TiAl alloy by anodization and pre-oxidation
To shield TiAl alloy from hot corrosion attack, a compact protective coating was fabricated by the combination of aluminizing, anodization and pre-oxidation. The hot corrosion behavior of the coated-TiAl specimen was investigated in the mixture salt consisting of 75 wt.％ Na2SO4 and 25 wt.％ NaCl at 700 °C. Results indicated that the anodization and pre-oxidation were beneficial to the generation of Al2O3 layer, which could act as a diffusion barrier to prevent the molten salts and oxygen from diffusing into the alloy during exposure to a hot corrosion environment while the aluminizing coating could provide sufficient aluminum source to support the continuous formation of Al2O3 layer. Moreover, the internal stress of the coating was reduced due to the formation of a gradient coating consisting of TiAl3 and TiAl2.

hot corrosionTiAl alloypack cementationanodizationhalogen effect

胡远涛、郑磊、严豪杰、伍廉奎、林向军、曹发和、蒋梅燕

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中山大学材料科学与工程学院,广州 510275

浙江工业大学材料科学与工程学院,杭州 310014

中国人民解放军军事科学院国防工程研究院,北京 100850

热腐蚀 TiAl合金 包埋法 阳极氧化 卤素效应

authors are grateful for the financial supports from the National Natural Science Foundation of ChinaShenzhen Science and Technology Innovation Program, ChinaFundamental Research Funds for the Central Universities, China

51971205JCYJ2019080715400559319lgpy20

2021

10.1016/S1003-6326(20)65487-5

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(1)
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