摘要
利用中性盐雾试验对物理气相沉积制备的NiCoCrAlY防护涂层进行常温腐蚀 ,研究了常温盐雾腐蚀对NiCoCrAlY涂层的微观形貌以及高温性能的影响 .试验结果表明 :经过盐雾腐蚀的涂层表面的均匀性和完整性均被破坏 ,涂层表面产生了大量的腐蚀坑 ;高温循环氧化以后 ,表面形成的Al2 O3 氧化膜变得粗糙、破碎且不连续 ,而且氧化膜容易剥落 ,降低了涂层的高温抗氧化能力 。
The NiCoCrAlY coatings prepared by electron beam physical vapor deposition (EB-PVD) was studied by a salt-spray-test. The influence of salt spray corrosion on the microstructure and high-temperature cyclic oxidation behavior of NiCoCrAlY coating was investigated. Results show that the alumina formed on the corroded NiCoCrAlY coating is rough, cracked and incontinuous and many pits was formed on the surface of the coating after the salt-spray test. The Al2O3 films formed within the pit are rougher, which suggests the congregation of stresses and spallation of the oxide film during the cyclic oxidation. These changes will reduce the protection ability of the coatings during high-temperature oxidation and shorten the lifetime of cyclic oxidation of NiCoCrAlY coatings.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2004年第10期1017-1020,共4页
Journal of Beijing University of Aeronautics and Astronautics
基金
航空基础科学基金资助项目 ( 0 115 10 0 6)
关键词
盐雾腐蚀
高温氧化试验
NICOCRALY涂层
Corrosion
Electron beams
High temperature effects
Microstructure
Oxidation
Physical vapor deposition
Salts
Spraying
Stresses
