采用SEM、XRD和EPMA等手段，研究了溅射NiCrAlY涂层渗Al前后在700℃盐和水蒸气下的腐蚀行为.结果表明：溅射涂层中的Cr和表面生成的Cr2O3会与盐和水蒸气反应，涂层与基体产生剥离，腐蚀相当严重，失去保护作用；渗Al涂层表面形成了单相的薄而致密的Al2O3膜，Al2O3保护膜在盐和水蒸气环境中具有很高的化学稳定性，可以对原溅射涂层起到有效的保护作用.
In order to improve the corrosion resistance of the sputtered NiCrAlY and provide the basis for the application of the coating,a nanocrystalline Ni-30Cr-8Al-0.5Y coating was deposited on a Ni-based superalloy by magnetron sputtering.Postaluminizing was performed on the sputtered coating to further upgrade its corrosion resistance.The corrosion behavior of the sputtered coatings without and with post aluminizing by NaCl deposit in oxygen containing water vapor at 700℃ had been investigated using TGA,SEM/EDS,XRD and EPMA,respectively.The results indicated that the sputtered coating suffers from serious corrosion due to the reaction of Cr and Cr2O3 with NaCl,resulting in spallation of oxide scales and thus degradation of the coating.On the contrary,a single Al2O3 scale forms on the post-aluminizing sputtered coating surface,which exhibits high chemical stability in corrosive environment and provides protection for the sputtered coating.
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