Effect of Temperature on Electrodeposited Nickel Nitride Composite Coatings

Abstract

In the present study, the effect of temperature during electrodeposition of Ni-TiN/Si3N4 composite coatings have been studied. The electrodeposition process was carried out for 15 minutes with a current density of 2.5 mA/cm2. A potensiostat system completed by an electrochemical cell with three electrodes was used for the experiment. Pt wire as the counter electrode, AgCl as the reference electrode and tungsten carbide (WC) as the working electrode. The electrolyte solution used consisted of 0,17 M NiCl2.6H2O, 0,38 M Ni2SO4.6H2O, 6 g/L TiN, 6 g/L AlN, 0,6 g/L Si3N4, 40 g/L H3BO3 and 0,6 g/L Sodium Dodecyl Sulfate (SDS). In this stydy, the temperature variations used were 35°C, 40°C and 45°C. The samples were characterized by using SEM, EDS, XRD and hardness test. The results show that the high electrodeposition temperature produce the smoother morphology and Ni grain refinement and lead to the increase in coating hardness.