为改善TiAl基合金的抗熔盐热腐蚀性能，采用大气等离子喷涂技术在TiAl基合金表面制备了稀土元素Ce改性的NiCrAlY涂层，对NiCrAlY（Ce）涂层体系进行900 ℃/60 h的熔盐热腐蚀试验，分析稀土元素Ce对NiCrAlY涂层热腐蚀行为和机制的影响。研究表明，添加稀土元素Ce改善了NiCrAlY涂层的抗熔盐热腐蚀性能。经过900 ℃/60 h的热腐蚀后，NiCrAlY/TiAl涂层体系表面的腐蚀层大面积剥落，致使TiAl基体受到严重侵蚀，涂层发生失效；而NiCrAlYCe/TiAl涂层体系表面仍覆盖着完整的腐蚀层，涂层仍保持一定的防护能力。添加稀土元素Ce促进了Al的选择性氧化，阻碍了尖晶石氧化物的形成，致密的Al₂O₃膜阻碍了S元素的内扩散，从而提高了NiCrAlY涂层的抗腐蚀性能，延长了其使用寿命。

In order to improve the hot corrosion resistance of TiAl-based alloys in molten salt， rare earth Ce modified NiCrAlY coating was prepared on the surface of TiAl-based alloy by atmospheric plasma spraying technology. The hot corrosion tests in molten salt of NiCrAlY（Ce） coatings were carried out at 900 ℃ for 60 h. The effect of rare earth element Ce on the hot corrosion behavior and mechanism was further discussed. The results show that the addition of rare earth element Ce can improve the hot corrosion resistance of NiCrAlY coating. After hot corrosion at 900 ℃ for 60 h， the corrosion layer on the surface of the NiCrAlY/TiAl coating system peels off severely， causing the failure of the coating. Therefore， the TiAl alloy has suffered from severe corrosion. For the NiCrAlYCe/TiAl coating system， its surface still covers with a complete corrosion layer and only small cracks generat at the interface between the coating and substrate. The NiCrAlYCe coating still possesses hot corrosion resistance property to a certain degree after corrosion.The addition of rare earth element Ce is beneficial to the selective oxidation of Al element， which hindered the formation of spinel oxides. The dense Al₂O₃ film blocks the internal diffusion of S element， thereby improving the corrosion resistance of NiCrAlY coating and extending service life of TiAl based alloy.