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

2014; Elsevier BV; Volume: 619; Linguagem: Inglês

10.1016/j.jallcom.2014.09.087

1873-4669

Aldrighi Luiz M. Oliveira, Josiane Dantas Costa, Mikarla Baía de Sousa, José Jaílson Nicácio Alves, Ana Regina Nascimento Campos, Renato Alexandre Costa de Santana, Shiva Prasad,

Advanced materials and composites

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 22 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/cm2) and the highest bath temperature (70 °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.