Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19796
Title: Equivalent circuit modelling of Ni-SiC electrodeposition under ramp-up and ramp-down waveforms
Authors: Hu, F
Chan, KC 
Keywords: Electrodeposition
Equivalent circuit model
Ni-SiC composites
Waveforms
Issue Date: 2006
Publisher: Elsevier
Source: Materials chemistry and physics, 2006, v. 99, no. 2-3, p. 424-430 How to cite?
Journal: Materials chemistry and physics 
Abstract: An equivalent circuit model (EC) for pulsed electrodeposition of Ni-SiC composite coatings was formulated and fit to electrochemical impedance spectra data for the system. Two different shaped waveforms, ramp-up and ramp-down waveforms both with relaxation time were applied to investigate the electrodeposition behaviour of Ni-SiC and to validate the equivalent circuit model. It was found that under the same average and peak current density, the shape of current waveform has significant effect on the electrodeposition behaviour. A higher instantaneous peak current for charge transfer was obtained by the ramp-up waveform, which results in finer grain size and enhanced hardness of the composites. The morphological characteristics of the Ni-SiC composites were also examined and the experimental results were in accordance with the predictions of the EC model.
URI: http://hdl.handle.net/10397/19796
ISSN: 0254-0584
EISSN: 1879-3312
DOI: 10.1016/j.matchemphys.2005.11.015
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