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Preparation and Characterization of Copper-Graphene Com-posite Films on Sintered NdFeB Surface
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1.Research Center of Magnetic and Electronic Materials, College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China;2.College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310000, China;3.State Key Laboratory of Rare Earth Permanent Magnet Materials, Earth-Panda Advance Magnetic Material Co., Ltd, Hefei 231500, China

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Fund Project:

National Natural Science Foundation of China (51871201); Key R&D Project of Zhejiang Provincial Department of Science and Technology (2021C01172)

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    Abstract:

    Corrosion resistance of rare earth permanent magnet material NdFeB was achieved by electrodeposited Cu-graphene (Cu-GR) composite films. The impact of the films on corrosion performances was studied by examining the morphology, water contact angle, and surface microhardness. The results show that the hydrophobicity and the hardness are enhanced as the concentration of graphene in the plating solution increases from 0 g·L-1 to 0.9 g·L-1. The characterization through SEM/EDS and XPS verifies the uniform dispersion of graphene sheets in the electrodeposited coating and the composition of Cu-GR composites. The electrochemical performance of the Cu-GR composite coating was investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS), and it is demonstrated that the electrochemical performance becomes more stable and the corrosion resistance is improved with the addition of graphene in the composites. For the sintered NdFeB samples coated with Cu-GR composite films with different graphene concentrations the best protective effect is obtained for the film prepared from the plating solution with a graphene concentration of 0.3 g·L-1.

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[Chen Haibo, Zheng Jingwu, Fu Yongcheng, Liu Youhao, Yi Xiaofei, Chen Jingwu, Qiao Liang, Huang Xiulian, Ying Yao, Cai Wei, Li Wangchang, Yu Jing. Preparation and Characterization of Copper-Graphene Com-posite Films on Sintered NdFeB Surface[J]. Rare Metal Materials and Engineering,2021,50(12):4306~4313.]
DOI:10.12442/j. issn.1002-185X.20210377

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History
  • Received:April 28,2021
  • Revised:November 26,2021
  • Adopted:June 22,2021
  • Online: December 30,2021
  • Published: December 24,2021