Avaliação da eletrodeposição da liga Co-W-P resistente a corrosão.

Abstract

The ternary alloy was electroplated Co-W-P and optimized operational and pH parameter with respect to its corrosion resistance. The stable development baths with relatively low pH levels and the use of complexing agents to stabilize is critical for obtaining good film quality and increase the lifetime of the electrolytic bath. The effect of current density and pH to obtain Co-W-P, corrosion has been studied in this work. The response surface methodology was used as optimization tool. The baths used to obtain this alloy free of complexing agents were unstable. Good quality films of alloy Co-W-P were obtained using an electrochemical bath with the complexing agent. The coatings showed good adhesion and gloss. The characterization and morphology of the alloy was performed using an x-ray fluorescence spectrometer energy dispersive (EDX) and scanning electron microscopy (SEM). The optimum operating conditions for obtaining this film were current density of 2mA / cm2 and especially 6 mA / cm2 and pH 4.0. However, it was observed the presence of micro nodules and cracks in the surface of the alloy studied.