Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (05): 864-868.doi: 10.3866/PKU.WHXB20090523

• ARTICLE • Previous Articles     Next Articles

Preparation, Heat Treatment and Corrosion Behavior of Amorphous Ni-W/ZrO2 Composite Coating

YANG Fang-Zu, HUANG Ling, XU Shu-Kai, ZHOU Shao-Min   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2008-12-15 Revised:2009-01-30 Published:2009-05-04
  • Contact: YANG Fang-Zu E-mail:fzyang@xmu.edu.cn

Abstract:

A Ni-W/ZrO2 composite coating was prepared by electrodeposition from a Ni-W bath containing zirconia solid particles suspended in an electrolyte solution by stirring. Results showed that the presence of zirconia particles influenced the electrodeposition, surface morphology, crystallographic structure, thermal treatment and corrosion resistance of the obtained composite coating. By comparison to Ni-Walloy electrodeposition bothWcontent in the Ni-Wmatrix and deposition current efficiency for the composite coating decreased. After heat treatment at 400 ℃ for 1 h some embedded zirconia particles were removed from the Ni-W matrix and W was enriched at the top surface of the deposit. Scanning electron microscopy (SEM) results revealed that the composite coating had a granular morphology and was crack-free.Adifferential scanning calorimetry (DSC) experiment combined with X-ray diffractometry(XRD) indicated that the Ni-W/ZrO2 composite coating was amorphous. The microhardness of the composite coating was higher than that of the nanocrystalline Ni-Walloy. After heat treatment of the composite coating its microhardness and corrosion resistance in 3% NaCl solution were greatly enhanced.

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

MSC2000: 

  • O646