Estudo dos componentes do banho eletrolítico para eletrodeposição da liga Ni-W-Mo.

Abstract

The corrosion process is constantly transforming the metallic materials in such a way that their durability and performance stop satisfying the purposes to which they are destined. A way to minimize the corrosion of metallic materials is to cover them with other materials. The electrodeposition is a method often applied to obtain metallic coverings resistant to corrosion and mechanical stress. Through electrodeposition it is possible to obtain metal alloys. Inside this class, the formation process of alloys through molybdenum is considered a process of induced electrodeposition. Inside this class, the formation process of alloys through molybdenum is considered a process of induced electrodeposition. An example of these alloys is the Ni-W-Mo. Thus, the proposed study optimizing the components of the bath (sodium tungstate and sodium molybdate) for alloy electrodeposition of Ni-W-Mo in terms of resistance to corrosion and polarization. Thus, it was evaluated quantitatively the influence of input variables on the corrosion resistance.The optimum values found for the Ni-W-Mo alloy were obtained with lower concentrations of sodium tungstate and sodium molybdate. In those conditions was obtained deposits of good quality, adherence and resistance to polarization.