Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (12): 1411-1416.doi: 10.3866/PKU.WHXB20041203

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Electrodeposition, Structure and Properties of an Amorphous Ni-W-B/ZrO2 Composite Coating

Yang Fang-Zu;Ma Zhao-Hai;Huang Ling;Xu Shu-Kai;Zhou Shao-Min   

  1. Chemistry Department, State Key Laboratory of Physical Chemistry of Solid Surfaces, Institute of Physical Chemistry, Xiamen University, Xiamen 361005
  • Received:2004-05-10 Revised:2004-07-07 Published:2004-12-15
  • Contact: Yang Fang-Zu

Abstract: Ni-W-B/ZrO2 composite coating was electrodeposited from the Ni-W-B electrolyte solution containing zirconia particles. The electrodeposition, heat treatment, structure, surface morphology, microhardness, and corrosion resistance of the composite coating were studied by means of differential scanning calorimeter (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical techniques. The results showed that the mass composition of the obtained Ni-W-B/ZrO2 composite coating was Ni 47.5%,W 40.9%, B 0.9% and ZrO2 10.7%. DSC combined with XRD results illustrated that zirconia took a remarkable influence on the structure of Ni-W-B matrix, leading the composite coating to a more obvious amorphous characteristics. The composite coating presented in higher microhardness compared to Ni-W-B alloy, granular structure with grain boundaries and crack-free. Zirconia particles were dispersed in the Ni-W-B matrix. After heat treatment at 400 ℃ for 1 h, surface morphology of the coating was kept almost no changes. The structure of the matrix was transferred to a crystal of Ni-W solid solution, and W was segregated to the surface of the deposit. The microhardness and corrosion resistance were enhanced, whereas most of zirconia particles were gotten rid of from the surface layer.

Key words: Ni-based alloy, Composite coating, Electrodeposition, Amorphous alloy, Heat treatment


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