The influence of Nb on hot corrosion behavior of Ni-based superalloy at 800 °C in a mixture of Na2SO4-NaCl

被引：23
作者：
Weng, Fei [1 ]
Yu, Huijun [2 ]
Wan, Kai [1 ]
Chen, Chuanzhong [1 ]
机构：
[1] Shandong Univ, Dept Mat Sci & Engn, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Shandong, Peoples R China
[2] Shandong Univ, Sch Mech Engn, Key Lab High efficiency & Clean Mech Manufacture, Minist Educ, Jinan 250061, Shandong, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH | 2014年 / 29卷 / 21期
关键词：
HIGH-TEMPERATURE CORROSION; SINGLE-CRYSTAL SUPERALLOYS; FE-BASED SUPERALLOYS; OXIDATION BEHAVIOR; MECHANICAL-PROPERTIES; SO2-O2; ATMOSPHERES; NI-5AL COATINGS; AL-ALLOY; 900-DEGREES-C; RESISTANCE;
D O I：
10.1557/jmr.2014.282
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
New-type Ni-based superalloys with and without Nb were designed in this study. Their hot corrosion behaviors were investigated at 800 degrees C with the deposition of a mixture of Na2SO4 and NaCl. The corrosion kinetics was studied by thermogravimetry. Microstructure of the corrosion scales was studied by SEM and the phase constituent was analyzed by XRD. Results showed that the corrosion kinetics followed approximately parabolic law. The corrosion scales on the two Ni-based alloys were comprised of Cr2O3, Al2O3, TiO2, and NiCr2O4. NiO was only detected in the scale on alloy without Nb. Nb2O5 appeared with the addition of 2.0 wt% Nb. No sulfide emerged in the scales. The corrosion scales both exhibited a layered structure. With Nb addition, the hot corrosion resistance of the alloy was notably improved. The action mechanism of Nb was investigated extensively in this study.
引用
收藏
页码：2596 / 2603
页数：8
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