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Citation: Yang Fang-Zu, Niu Zhen-Jiang, Cao Gang-Min, Xu Shu-Kai, Zhou Shao-Min. Electrocrystallization Mechanism、Structure and Microhardnedss of Ni-W-P Alloy Eletrodeposits[J]. Acta Physico-Chimica Sinica, ;2000, 16(11): 1022-1027. doi: 10.3866/PKU.WHXB20001111 shu

Electrocrystallization Mechanism、Structure and Microhardnedss of Ni-W-P Alloy Eletrodeposits

1.
Chemistry Department,State Key Laboratory for the Physical Chemistry of the Solid Surface,Institute of Physical Chemistry,Xiamen Univ,Xiamen 361005

Received Date: 28 February 2000
Available Online: 15 November 2000

The electrodeposition characteristics, structure and microhardness of Ni-W-P alloy have been studied by the methods of cyclic voltammetry, potentiostatic step and X-ray diffraction(XRD). The results showed that Ni-W-P alloy electrodeposit obtained from the solution containing ammonium citrate as complexing agent presented lower electrochemical activity compared with Ni-W alloy electrodeposit. Based upon the i～t curves of potentiostatic step, it was revealed that electrocrystallization of Ni-W-P alloy on glassy carbon electrode followed the mechanism of instantaneous nucleation and three dimensional growth with diffusion controll. The crystal nucleus number on the surface of electrode was raised by the increase of overpotential. XRD experimental results showed that the Ni-W-P alloy electrodeposits obtained were obviously of the amorphous structure, and the microhardness of the alloy was about 450 kg/mm2 at the stated plating solution and conditions.
- Ni-W-P alloy,
- Electrocrystallization,
- Structure,
- Microhardness
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