Laser-cladding CeO2-doped Ni-based composite coatings were prepared on the surface of a titanium alloy, and the effects of CeO2 addition on the microstructure, microhardness, and corrosion resistance of the prepared coatings were studied. The results showed that TiC, NiTi, Ni3Ti, and Ti2Ni phases were formed on the prepared coatings. Moreover, the addition of CeO2 in laser-cladding coatings effectively refined the microstructure and reduced the number of cracks generated in the laser-cladding process. When the amount of CeO2 was 2%, the number of cracks in the laser-cladding coating was significantly reduced compared with that of 0%. When the content of CeO2 was 2% or 3%, the microhardness of laser-cladding coatings reached the maximum value. At the same time, it was found that the appropriate addition of CeO2 was helpful to improve the corrosion resistance of the laser-cladding coating. However, excessive CeO2 addition could reduce the corrosion resistance of the laser-cladding coating.

中文翻译：

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TC4上激光熔覆CeO2掺杂Ni基复合涂层的组织和腐蚀行为

在钛合金表面制备了激光熔覆CeO2掺杂Ni基复合涂层，研究了CeO2添加量对涂层组织、显微硬度和耐腐蚀性能的影响。结果表明，制备的涂层上形成了 TiC、NiTi、Ni3Ti 和 Ti2Ni 相。此外，在激光熔覆涂层中添加 CeO2 有效地细化了微观结构，减少了激光熔覆过程中产生的裂纹数量。当CeO2添加量为2%时，激光熔覆涂层裂纹数量较0%时显着减少。当CeO2含量为2%或3%时，激光熔覆涂层的显微硬度达到最大值。同时，发现适当添加CeO2有助于提高激光熔覆涂层的耐蚀性。然而，过量的 CeO2 添加会降低激光熔覆涂层的耐腐蚀性能。