Estudo sobre as propriedades magnéticas e corrosivas da liga CO-W obtida pelo processo de eletrodeposição

Abstract

Metallic corrosion represents a recurring challenge in aqueous environments, requiring the development of effective protection strategies. In this context, electrodeposition stands out as a versatile and promising technique for obtaining protective coatings. In this work, Co-W coatings were produced by electrodeposition using sodium citrate, cobalt sulfate, and sodium tungstate as precursors. The influence of electrolyte pH on the composition, morphology, crystalline structure, corrosion resistance, and magnetic properties of the alloys was investigated. The results showed that pH has a decisive effect on tungsten incorporation and on the final characteristics of the deposits: at neutral pH, a higher W content was observed; in acidic medium, pronounced cracks occurred but with improved magnetic response; and in basic pH, crack-free coatings with superior anticorrosive performance were obtained. XRD analyses confirmed the formation of amorphous coatings, while electrochemical and magnetic tests demonstrated the direct relationship between microstructure, corrosion resistance, and functional behavior. In summary, the study evidenced that pH control is a critical factor in tailoring the properties of the Co-W alloy, enabling the optimization of its application in both corrosion protection and magnetic devices.