Microstructure and Corrosion Behavior of Laser-Cladding CeO2-Doped Ni-Based Composite Coatings on TC4

Fangxia Ye,Xuchao Ye,Peiying Bian,Ling Liu,Hong Wu,Wenxuan Shao,Mingxia Liu,Xiaoyan Wang,Yanxiang Xie

doi:10.1155/2020/8690428

Abstract

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.

Highlights

Research ArticleFangxia Ye ,1,2,3 Wenxuan Shao, Xuchao Ye, Mingxia Liu, Yanxiang Xie, Peiying Bian, Xiaoyan Wang, Ling Liu, and Hong Wu5
Titanium alloys are widely adopted for aerospace, defense, automobile, medical, and other applications due to their low density, high specific strength, good corrosion resistance, and fatigue resistance
When the content of CeO2 is less than 2%, it can effectively reduce the crack generation of the laser-cladding coatings

Summary

Research Article

Fangxia Ye ,1,2,3 Wenxuan Shao, Xuchao Ye, Mingxia Liu, Yanxiang Xie, Peiying Bian, Xiaoyan Wang, Ling Liu, and Hong Wu5. 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 addition of CeO2 in laser-cladding coatings effectively refined the microstructure and reduced the number of cracks generated in the lasercladding 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. It was found that the appropriate addition of CeO2 was helpful to improve the corrosion resistance of the laser-cladding coating. Excessive CeO2 addition could reduce the corrosion resistance of the laser-cladding coating

Introduction

Results and Discussion

Specimen number

Ce L

Anode polarization curve

Conclusions