Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (02): 150-154.doi: 10.3866/PKU.WHXB20010212

• ARTICLE • Previous Articles     Next Articles

Structure and Property of Ni-W-B Alloy Electrodeposits Before and After Heat Treatment

Cao Gang-Min;Yang Fang-Zu;Huang Ling;Niu Zhen-Jiang;Xu Shu-Kai;Zhou Shao-Min   

  1. Chemistry Department, State Key Laboratory for Physical Chemistry of Solid Surfaces, Institute of Physical Chemistry, Xiamen University,Xiamen 361005
  • Received:2000-05-08 Revised:2000-09-05 Published:2001-02-15
  • Contact: Yang Fang-Zu

Abstract: The structure and microhardness of NiWB alloy were studied by means of electrochemical techniques, XPS, DSC and XRD before and after heat treatment. The results showed that the process of NiWB alloy electrodeposition was accompanied by the chemical deposition of Ni and adulteration of Na2B4O7 in the deposit. NiW alloy presented in nanocrystalline structure and NiWB in amorphous structure were both coarsened in grain size and led to the evolution of Ni4W, and precipitation of Ni-B compound such as Ni2B, Ni3B in NiWB alloy after heat treatment. The maximum microhardness could be observed for NiW alloy at the value of 919.8 kg•mm-2 after heat treatment for 2 hours at temperature of 400 ℃ and NiWB alloy at 1132.2 kg•mm-2 (500 ℃, 2 hrs).

Key words: Ni-W-B alloy, Electrodeposition, Structure, Microhardness, Heat treatment