Effect of enamel coating on oxidation and hot corrosion behaviors of Ti-24Al-14Nb-3V alloy

被引：0
|
作者：
Yuming Xiong
Chunhong Guan
Shenglong Zhu
Fuhui Wang
机构：
[1] Institute of Metal Research of Chinese Academy of Sciences,State Key Laboratory for Corrosion and Protection
来源：
Journal of Materials Engineering and Performance | 2006年 / 15卷
关键词：
enamel coating; hot corrosion; oxidation; titanium aluminum intermetallics;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The effect of enamel coating on the isothermal and cyclic oxidation at 900 °C in air and on the hot corrosion resistance of Ti-24Al-14Nb-3V in both 85% Na2SO4+15%K2SO4 and 15%NaCl+85% Na2SO4 molten mixed salts at 850 °C was investigated. The results indicated that Ti-24Al-14Nb-3V alloy exhibited poor oxidation resistance due to the formation of nonprotective Al2O3+TiO2+AlNbO4 scales and poor hot corrosion resistance due to the spallation of scales formed in molten Na2SO4+K2SO4 and NaCl+Na2SO4. Enamel coating suppressed the migration of oxygen and corrosive ions into the substrate to improve the oxidation and hot corrosion resistance of Ti-24Al-14Nb-3V alloy. However, the dissolution of oxides components of the coating into the molten salts degraded enamel coating and the degradation of the coating involved a process by which Cl− anion penetrated into the substrate through voids in the coating to accelerate corrosion of Ti-24Al-14Nb-3V alloy.
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页码：564 / 569
页数：5
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