Microstructure and Corrosion Behavior of Laser-Cladding CeO[sub.2]-Doped Ni-Based Composite Coatings on TC4

Laser-cladding CeO[sub.2]-doped Ni-based composite coatings were prepared on the surface of a titanium alloy, and the effects of CeO[sub.2] addition on the microstructure, microhardness, and corrosion resistance of the prepared coatings were studied. The results showed that TiC, NiTi, Ni[sub.3]Ti, and Ti[sub.2]Ni phases were formed on the prepared coatings. Moreover, the addition of CeO[sub.2] in laser-cladding coatings effectively refined the microstructure and reduced the number of cracks generated in the laser-cladding process. When the amount of CeO[sub.2] was 2%, the number of cracks in the laser-cladding coating was significantly reduced compared with that of 0%. When the content of CeO[sub.2] 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 CeO[sub.2] was helpful to improve the corrosion resistance of the laser-cladding coating. However, excessive CeO[sub.2] addition could reduce the corrosion resistance of the laser-cladding coating.