Comparative Study on the Microstructure and Properties of Co-based and Ni-based Coatings Prepared by Laser Cladding

Wu Weijian; Feng Yueqiao; Li Wei

doi:10.13832/j.jnpe.2024.080050

Volume 46 Issue 4

Aug. 2025

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Wu Weijian, Feng Yueqiao, Li Wei. Comparative Study on the Microstructure and Properties of Co-based and Ni-based Coatings Prepared by Laser Cladding[J]. Nuclear Power Engineering, 2025, 46(4): 273-281. doi: 10.13832/j.jnpe.2024.080050

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Wu Weijian, Feng Yueqiao, Li Wei. Comparative Study on the Microstructure and Properties of Co-based and Ni-based Coatings Prepared by Laser Cladding[J]. Nuclear Power Engineering, 2025, 46(4): 273-281. doi: 10.13832/j.jnpe.2024.080050

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Comparative Study on the Microstructure and Properties of Co-based and Ni-based Coatings Prepared by Laser Cladding

doi: 10.13832/j.jnpe.2024.080050

1.
Shanghai No.1 Machine Tool Works Co., Ltd., Shanghai, 201308, China
2.
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
3.
State Key Laboratory of Advanced Nuclear Energy Technology, Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2024-08-20
Rev Recd Date: 2024-11-22
Publish Date: 2025-08-15

Abstract

Abstract

To verify the feasibility of replacing Co-based coatings with Ni-based coatings, laser cladding was used to prepare Ni55 Ni-based coatings and Stellite 6 Co-based coatings. The study compared the advantages and disadvantages of the two coatings in terms of microstructure, wear resistance, and corrosion resistance through observations of microstructure, hardness analysis, friction and wear testing, and electrochemical corrosion testing. The results showed that the dilution rate of the Ni55 coating was slightly higher, and the microstructure was mostly isometric crystal, while the Stellite 6 coating had dendritic crystal growing parallel to the heat flow direction. The average hardness of the Ni55 coating was 527 HV, higher than the 448 HV of the Stellite 6 coating. The friction and wear test results showed that the friction coefficient and wear loss weight of the Ni55 coating were both lower than those of the Stellite 6 coating at room temperature. At 300 ℃, the friction coefficient of the Ni55 coating was slightly higher than that of the Stellite 6 coating, but the wear loss weight and wear volume were both lower. The electrochemical corrosion test results showed that the Ni55 coating had better corrosion resistance. Therefore, the Ni55 coating has the potential to replace the Stellite 6 coating for the drive mechanism wear-resistant parts such as hook claws of the nuclear reactor control rod.
- Laser cladding,
- Ni-based alloy,
- Co-based alloy,
- Friction and wear,
- Electrochemical corrosion

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References(10)

References

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