Effect of pulse electrodeposition parameters on the properties of Ni/nano-SiC composites

EFFECT OF STIRRING RATE ON ELECTROCHEMICAL CODEPOSITION OF Ni-SiC COMPOSITE

“…These peaks are assigned for nickel according to JCPDS data: 04-0850. This sharp picks represents the mixed crystalline phase of coated sample which is found to be different than the pure nickel coating as previously reported by P. Gyoftou et al [21].The highly intense (311) and (111) peak line is attributed to a dispersed[2 1 1] orientation which is responsible to higher hardness [28]. Fig .…”

“…The overall properties of the electrocodeposited materials depend upon the amount of incorporated nano particles in growing metal matrix and their distribution While, the incorporation of these particles depends upon the different parameters like particle characteristics [17], bath composition [18], bath temperature [19], bath pH [20], stirring rate, types of current applied, variations in current frequency, current density and duty cycle [21]. In order to maintain the particles in suspension and to enhance particles transport towards cathode surface, electrolyte agitation is required.…”

Electrodeposition of Metal Matrix Nanocomposites: Improvement of the Chemical Characterization Techniques

“…Therefore pulse plating techniques are very important for the tailoring of nanocomposites. In the case of Ni-SiC co-deposition, the application of pulsed current techniques results in the production of composite coatings with higher percentages of incorporation, reduced crystallite sizes and a more uniform distribution of SiC particles in the Ni matrix than those achieved under direct current regime (Gyftou et al, 2008). In the pulsed-reverse current technique (PRC) a stripping time is introduced into the plating cycle, during which the metal surface protrusions selectively dissolves, what ensures a more uniform deposit (Chandrasekar & Pushpavanam, 2008).…”

“…Otherwise, it has been observed that the amount of embedded SiC particles increases with both increasing concentration of suspended SiC particles and additives' presence in the electrolyte (Gyftou et al, 2008). Indeed the particle loading in suspension is a very important parameter.…”

“…The concentration of particles suspended in solution varies from 2 up to 200 g/L producing composites with typically 1-10 vol.% of embedded particles (Stojak et al, 2001). With the increasing availability of nanoparticles, the interest of the low-cost and lowtemperature composite electroplating is continuously growing, with the major challenge being the achievement of high co-deposition rates and homogenous distribution of the particles in the metallic matrix (Gyftou et al, 2008). Fundamentally, the electrocodeposition process and hence the structure, the morphology and the properties of the composite coatings is affected by the electrodeposition parameters like the electrolysis conditions (composition and agitation of the electrolytic bath, presence of additives, temperature, pH), the electrical profile (Gomes et al, 2005;Fustes et al, 2008) and the particle properties (type, size, shape, surface charge, concentration and dispersion in the bath) (Maurin & Lavanant, 1995;Hovestad & Janssen 1995;Kantepozidou et al, 1996).…”