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采用磁控溅射方法在高Cr镍基单晶合金上沉积晶粒平均尺寸小于100 nm的Ni30Cr12Al0.3Y涂层,通过对镍基单晶合金及其Ni30Cr12Al0.3Y涂层在900℃的75%Na2SO4+25%K2SO4熔盐中的腐蚀动力学曲线测定及组织观察,研究了Ni30Cr12Al0.3Y涂层对高Cr镍基单晶合金热腐蚀行为的影响。结果表明,镍基单晶合金遭受了灾难性的热腐蚀,出现严重的内硫化和内氧化现象;而Ni30Cr12Al0.3Y涂层在热腐蚀过程中,仅涂层表面生成连续的Al2O3氧化膜,表现出优良的抗热腐蚀性能。
Magnetron sputtering method is used to deposit Ni30Cr12Al0.3Y coating with average grain size less than 100 nm on high Cr nickel-base single crystal alloy. The Ni30Cr12Al0.3Y coating is deposited on the surface of high-Cr nickel-based single crystal alloy at 75% Na2SO4 + 25% K2SO4 molten salt corrosion kinetics curve measurement and microstructure observation, Ni30Cr12Al0.3Y coating on the high-Cr nickel-based single crystal alloy hot corrosion behavior. The results show that the nickel-based single crystal suffers from catastrophic hot corrosion and severe internal and internal oxidation. In the hot corrosion process of Ni30Cr12Al0.3Y, only continuous Al2O3 oxide film is formed on the surface of the coating. Outstanding resistance to hot corrosion.