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In this article, Ni-Co/SiC nanocomposites were successfully deposited by pulse current electrodeposition using modified nickel and cobalt acid solution containing SiC nanoparticles. Effects of SiC concentration on microstructure, microhardness, and properties of Ni-Co/SiC nanocomposites were analyzed by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Xray diffraction (XRD), microhardness tests, atomic force microscopy (AFM), and electrochemical tests. The results demonstrated that SiC content in Ni-Co/SiC nanocomposites increased to 9.0 wt% when SiC concentration increased from 0 to 10 g/L. Ni-Co/SiC nanocomposites prepared at 10 g/L had the finest and most uniform microstructure compared with the others. When SiC concentration increased from 5 to 10 g/L, average grain size in Ni-Co/SiC nanocomposites decreased from 67.5 nm to 58.1 nm. AFM revealed that Ni-Co/SiC nanocomposite deposited at 10 g/L possessed a fine and uniform microstructure without any evident defects such as pores or cracks. Ni-Co/SiC nanocomposite deposited at 10 g/L with average microhardness of 894.5 Hv possessed the minimum corrosion current density of 1.6×10 mA/cm, demonstrating its outstanding corrosion resisting property.

Effect of SiC Concentration on Microstructure and Properties of Ni-Co/SiC Nanocomposites Fabricated by Pulse Electrodeposition