Abstract:
Conservation of natural resources is the basis of sustainability, which aims to achieve a balance between the resources and economic activity, and, in this context, the use of NdFeB-based magnets mainly enables sustainable power generation in particular. These magnetic alloys are susceptible to corrosion and require protection. This study focused on the development of an oxalate-based conversion layer for temporary protection of the magnet and as a pretreatment for anchoring organic coatings. The oxalate layers were obtained by immersing the magnets in a 0.11 mol/L oxalic acid solution, with constant stirring at 500 rpm, and at two temperatures: 25 °C and 50 °C. The layers were characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and scanning vibrating electrode technique (SVET). The crystals obtained were needle-shaped and were strongly adhered to the surface. It was found that the immersion at 50 °C accelerated the formation of the layers compared to 25 °C, and the processing of the layers showed practically no sludge formation. The oxalate based conversion coating proved to be a suitable option for a green temporary protection of permanent magnets (NdFeB).
Referência:
SANTOS, Célia Aparecida Lino dos; PASTRIAN, Fabián Andree Cerda; CARDOSO, Juliana Lopes; LANDGRAF, Fernando José Gomes. Development of oxalate-based layers for temporary protection of NdFeB magnets. In: LATINCORR & INTERCORR 2023, Rio de Janeiro. Proceedings… 3 p.
Documento com acesso restrito. Logar na BiblioInfo, Biblioteca GITEB/IPT para acessar o trabalho em PDF:
