Effect of coating degradation on the hot corrosion behaviour of directionally solidified superalloy

被引：9
|
作者：
Zhan, Xin [1 ,2 ]
Wang, Dong [2 ]
Dong, Jiasheng [2 ]
Lou, Langhong [2 ]
Zhang, Jian [2 ]
机构：
[1] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Peoples R China
来源：
CORROSION SCIENCE | 2023年 / 215卷
基金：
中国国家自然科学基金;
关键词：
NiCoCrAlY coating; Coating degradation; Hot corrosion; IDZ; Superalloy; HIGH-TEMPERATURE OXIDATION; SINGLE-CRYSTAL SUPERALLOY; THERMAL-BARRIER COATINGS; BOND COAT; DEPLETION; MECHANISMS; ALUMINUM; KINETICS;
D O I：
10.1016/j.corsci.2023.111057
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of coating degradation on the hot corrosion performance of coated alloys was investigated in Na2SO4/ NaCl (75:25, wt./wt.) salt at 900 degrees C. Degraded coatings were obtained by thermal exposure before the hot corrosion test. The results indicate that when the beta-NiAl phases within the coating were completely depleted, the hot corrosion process was delayed due to the Al-rich interdiffusion zone (IDZ) formed after the 900 degrees C thermal exposure to provide Al for the healing of the Al2O3 layer. Nevertheless, the Cr-rich IDZ formed after 1000 degrees C thermal exposure failed to repair the Al2O3 layer, causing the alloy to corrode aggressively even though Cr has been substituted for Al to participate in the corrosion process.
引用
收藏
页数：14
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