The Nd-(Fe,Co)-B Powder Biencapsulation With Cu/epoxy Resin and Its Effect on Pitting Corrosion Resistance of Bonded Magnets
Abstract
In this chapter the effect of the Nd-(Fe,Co)-B powder particle biencapsulation
with Cu layer on bonded magnetic materials corrosion behaviour has been investigated.
Bonded magnets were prepared from nanocrystalline magnetic Nd11Fe77Co5B6 powder.
Powder particles before consolidation were preliminary etched with oxalic acid and then
coated with bilayer (powder biencapsulation). The powder surface was coated as a first
with Cu layer during 1 or 5 minutes in copper plating bath and the second layer was thermosetting
epoxy-resin. The polarization curves in phosphate environment with addition of
chloric ions were determined. It has been established that the used biencapsulation method
not always satisfactorily isolate individual particles of the powder and consequently,
significantly inhibits corrosion processes of the final material, especially in passivating
environment containing Cl-.
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