Improving hot corrosion resistance of aluminized TiAl alloy by anodization and pre-oxidation

被引：29

作者：

Hu, Yuan-tao ^{[1
,2
]}

Zheng, Lei ^{[3
]}

Yan, Hao-jie ^{[1
,2
]}

Wu, Lian-kui ^{[1
,2
]}

Lin, Xiang-jun ^{[3
]}

Cao, Fa-he ^{[1
]}

Jiang, Mei-yan ^{[2
]}

机构：

[1] Sun Yat Sen Univ, Sch Mat Sci & Engn, Guangzhou 510275, Peoples R China

[2] Zhejiang Univ Technol, Coll Mat Sci & Engn, Hangzhou 310014, Peoples R China

[3] PLA, Inst Def Engn, AMS, Beijing 100850, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2021年 / 31卷 / 01期

基金：

中国国家自然科学基金;

关键词：

hot corrosion; TiAl alloy; pack cementation; anodization; halogen effect;

D O I：

10.1016/S1003-6326(20)65487-5

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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 degrees 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.

引用

页码：193 / 206

页数：14

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