SANTOS, É. S.; http://lattes.cnpq.br/0868041575610986; SANTOS, Évany Silva dos.
Resumen:
Electrodeposition has been widely used in the development of metallic alloys, in order to
promote corrosion-resistant coatings. Various electrolytic bath compositions are studied to
obtain the Ni-Co alloy, therefore, the addition of sodium citrate (complexant) to the bath has
gained prominence in studies. To optimize the process, a 2² Rotational Central Composite
Design (DDCR) was used with axial points (-α, +α) and 2 central points, totaling 10
experiments. From the citrate bath it was possible to observe that there was the anomalous
behavior characteristic of Ni-Co alloys, coatings obtained in acidic zones presented a more
uniform morphology, greater saturation magnetization, however, low values for corrosion
resistance due to the high content of cobalt in their composition, in addition, they presented a
mixture of phases (fcc+hcp). The coatings obtained in alkaline zones presented a nodular
morphology, similar to cauliflower, which is linked to the highest nickel content in the alloy
according to chemical composition results. These coatings showed low saturation
magnetization, however, good results for corrosion. Therefore, it is concluded that in the study
it was possible to obtain alloys with high nickel contents, which allows applications such as
protective coatings and alloys with high cobalt contents, enabling their use in the magnetic
materials sector.