In this research, the electrokinetic behavior and stability of nanosized SiC particles suspended in various electroplating solutions were studied. Analyses were performed using electrophoretic mobility photometry and streaming current (SC) techniques. The electrolytes included NiCl2, Ni(SO3NH2)(2), and Na3Co(NO2)(6), which are currently used in composite plating solutions with concentrations as high as 0.5M. The results shelved that the adsorption of dissolved Ni2+ ions onto the surface of the SiC in the pH range 4-8 changed the sign and magnitude of the surface potential. Moreover, trivalent complex species Co(NO2)(3-)(6) replaced nickel species on the SIC surface and decreased the surface charge of SiC to between pH 3 and pH 5, Even in a highly concentrated electrolyte solution, the SIC particles still maintained a positive charge in a Ni(SO3NH2)(2) suspension with nickel coplating on the cathode. The difference between the SC reading and the zeta potential, as well as the surface adsorption of various species onto the SIG, are discussed here.