Electrochemical Deposition of Ni-Mo-PCTFE Nanocomposite Coatings and Investigation of their Corrosion Resistance in 3.5 wt. % NaCl Solution

In this research, the Ni-Mo-PCTFE nanocomposite coatings in the presence of various concentrations of PCTFE were prepared on copper sheets by electrodeposition from citrate bath. Effect of PCTFE concentration on the corrosion resistance was determined. Surface morphology and composition of the composite coatings were characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) measurements. Also, corrosion resistance of coatings was evaluated using open-circuit potential (EOCP) measurements, electrochemical impedance spectroscopy (EIS) and Tafel polarization techniques in 3.5 wt.% NaCl solution. The study reveals significant shift in corrosion potential towards the noble direction, decrease in corrosion current density and increase in charge transfer resistance with the incorporation of PCTFE particles in the Ni-Mo matrix. The highest value of charge transfer resistance was obtained for Ni-Mo-PCTFE coating deposited from solution with concentration of 8 g /L PCTFE.