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Abstract：
The microstructures, surface morphology and composition of nanocrystalline Ni-Co alloy and nano SiC/Ni-Co composite coating prepared by pulse electrodeposition were studied by XRD, SEM and EDS. The corrosion characteristics of nanocrystalline Ni-Co alloy and nano SiC/Ni-Co composite coating were comparatively tested by the soak method and the electrochemical polarization method, respectively. The experimental results indicate that typical nanocrystalline Ni-Co alloy and nano SiC/Ni-Co composite coatings can be synthesized by pulse electrodeposition, and with the increasing of the nano SiC particles, the grain size of nano SiC/Ni-Co composite coating is diminished while the microhardness is increased. The nano SiC/Ni-Co composite coating has better dispersion and it exhibits better corrosion resistance in 3.5 wt%NaCl and 5 wt%HCl solution than the nanocrystalline Ni-Co alloy. The surface morphology of all samples after corrosion in 3.5 wt%NaCl solution shows good corrosion resistance, while the samples show spot corrosion in 5 wt%HCl solution.
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Acta Materiae Compositae Sinica
ISSN： 1000-3851
Year： 2009
Issue： 4
Volume： 26
Page： 111-118
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ESI Highly Cited Papers on the List： 0 Unfold All
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30 Days PV： 8
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