Studies on electrodeposition and characterization of the Ni-W-Fe alloys coatings

Corrosion has been responsible for industrial maintenance cost as well as for industrial accidents. A key to prevent corrosion is to develop advanced materials with highly anti-corrosive properties. The electrodeposition has been one of the most important techniques for obtaining these materials. The objective of this work is to develop and optimize the parameters to obtain a new Ni-W-Fe alloy with high resistance to corrosion. A factorial design 2(2) with 2 center points was used to find the optimal current density and bath temperature for Ni-W-Fe electrodeposition. The influence of such variables on the cathodic current efficiency and polarization resistance were obtained. The alloys obtained with the highest current density (125 mA/cm(2)) and the highest bath temperature (70 degrees C) had the best anticorrosive properties, which are superior to anticorrosive properties of Ni-W-Fe available in the literature. The obtained alloys had the highest tungsten content compared with other alloys studied of about 46 wt.%. The highest cathodic current efficiency was 34% for the alloy with a chemical composition of 3 wt.% Fe, 29 wt.% W and 68 wt.% Ni. (C) 2014 Elsevier B.V. All rights reserved.