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Bala, Henryk
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article
The effect of Cr, Co, W, Zr and Pb (M) substitution on the structure and corrosion resistance of nanocrystalline Nd<inf>10</inf>Fe<inf>84-x</inf>M <inf>x</inf>B<inf>6</inf> magnets
Abstract
<p>The effect of partial substitution of iron with Cr, Co, W, Zr or Pb in nanocrystalline Nd<sub>10</sub>Fe<sub>84-x</sub>M<sub>x</sub>B<sub>6</sub> magnetic material on general corrosion in acidified sulphate environment is discussed in the paper. The materials were produced from spec pure powders of Nd, Fe, Fe-B and additive powders (Cr, Co, W, Zr or Pb) by mechanical alloying. The structural analysis was performed using a JEOL JEM 1200 TEM microscope and the stereological parameters of the microstructures were determined. The magnetic properties were measured with a pulse field hysteresigraph. The following substitutions are the most favourable in terms of the magnetic properties of nanocrystalline Nd<sub>10</sub>Fe<sub>84-x</sub>M <sub>x</sub>B<sub>6</sub> magnets: cobalt (10 at. %), chromium (4 at. %), tungsten (15 at. %), lead (1.5 at. %) and zirconium (2 at. %). The samples for corrosion investigations were prepared from annealed powders by shock compaction. For electrochemical tests, electrodes made from the samples in the form of rotating discs were used. Resistance to general corrosion of the tested materials was evaluated by potentiokinetic polarisation tests. It was shown that the applied additions inhibit the corrosion process by up to 2-3 times. Chromium, cobalt and lead additives facilitate passivation of the alloys.</p>