Effect of duty cycle and frequency of pulsed current on the properties of nickel - silicon carbide nanocomposite coatings

Ni-SiC composite coatings are widely used in industry (equipment high wear resistance coatings, corrosion resistant coatings, ship and boiler coatings,. .. ). Its unique properties in high wear resistance, corrosion resistance and tribological properties. Researchers tend to investigate this coating. This study covers Ni-SiC composite coating under pulsed current using a rotating disk electrode. Coating properties were investigated by changing the duty cycle and frequency of pulsed current in waat's bath. Percent of the particles in the coating changes by the frequency and duty cycle. Amount of nanoSiC particles inside the deposit reached its maximum value in frequency of 10 Hz and 80% as duty cycle. In this condition, amount of nanoSiC particles inside the deposit was calculated at 16.2% as volume percent. The size of SiC powders is50 nm in this state. Least roughness amount is 0.38 micrometer. It obtained at a frequency of 100 Hz and 50% as duty cycle. In nano composite coating with increasing of particle volume percent in coat the corrosion current density decreased from7.09μA/cm2to 0.015 μA/cm2. Also EIS resistant is increased from 1029 Ω to 7232 Ω. With increasing rotation speed of the electrode the morphology changed from composition of the pyramid-shaped and flower cabbage to flower cabbage mode completely.