Comparsion of corrosion resistance of Ni-W-PCTFE nanocomposite coatings with Ni-W coatings in the 3.5%wt NaCl Solution

In the present work, Ni-W-PCTFE nanocomposite coatings were electrodeposited in the presence of different concentrations of polychlorotrifluoroethylene (PCTFE) from the tartrate bath on the plates of copper. The effect of the concentration of PCTFE was investigated on the corrosion resistance. Surface morphology and composition of the nanocomposite coating were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) measurements. Corrosion resistance of produced coatings were evaluated using open-circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and polarization techniques in 3.5% wt NaCl solution. The results of these studies show a significant shift in the corrosion potential toward noble potentials, decrease in the corrosion current density and increase in the charge transfer resistance with the incorporating of PCTFE particles in the Ni-W matrix. While The lowest corrosion current (5 ×10-5A cm-2) and the highest charge transfers resistance (19686 Ω cm2) for nanocomposite coatings obtained from the bath containing 4 g/L PCTFE.