The effect of Cr, Co, W, Zr and Pb (M) substitution on the structure and corrosion resistance of nanocrystalline Nd10Fe84-xMxB6 magnets

• Autorzy: Pawłowska, G. , Kaszuwara, W. , Bala, H.
• Języki publikacji: EN

Abstrakty

EN

The effect of partial substitution of iron with Cr, Co, W, Zr or Pb in nanocrystalline Nd10Fe84-xMxB6 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 Nd10Fe84-xMxB6 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.

Słowa kluczowe

EN

corrosion; passivation; permanent magnets; nanocrystalline materials

• Czasopismo: Materials Science Poland
• Rocznik: 2009
• Tom: Vol. 27, No. 1
• Strony: 51--59
• Opis fizyczny: Bibliogr. 19 poz.

Twórcy

autor

Pawłowska, G.

autor

Kaszuwara, W.

autor

Bala, H.

• Czestochowa University of Technology, Faculty of Materials Processing Technology and Applied Physics Department of Chemistry,Al. Armii Krajowej 19, 42-200 Częstochowa, Poland

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