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.
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收藏
页数：14
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