SOME CORROSION ELECTROCHEMICAL PROPERTIES OF THE Nd-Fe-B TYPE MAGNETIC MATERIAL

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F15%3A86095790" target="_blank" >RIV/61989100:27360/15:86095790 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

SOME CORROSION ELECTROCHEMICAL PROPERTIES OF THE Nd-Fe-B TYPE MAGNETIC MATERIAL

Popis výsledku v původním jazyce

Research in the field of magnetic materials based on Nd-Fe-B is focused on the improvement of certain magnetic characteristics by alloying of suitable elements (Co, Dy, Pr, Cu), extending the thermal stability of these permanent magnets, improving their corrosion resistance and the creation of nano-structure modifications. Magnets based on Nd-Fe-B are susceptible to corrosion, especially in humid atmospheres. The corrosion resistance of these magnets is a function of the structure, temperature, degree of environment humidity and Nd-rich phase reactivity. The paper is focused on determining and comparing the corrosion resistance of magnetic material NdPr-FeM-B (produced by powder metallurgy, M = Cu,Co,Al) in several environments. For comparative purposes, unalloyed carbon steel (C ≤ 0,10% wt.) was tested under the same conditions. On the basis of electrochemical polarization measurements there were determined polarization curve, corrosion characteristics and parameters (corrosion potential, polarization resistance, pitting potentials, etc.) of mentioned selected materials in aqueous solutions (Na2SO4, NaH2PO4, NaCl). Salt spray test was also performed with these materials. The heterogeneous structure of magnetic material and uneven and/or localized corrosion was observed using microscopy. In the sodium chloride solution a higher corrosion resistance reached steel in comparison with the magnet, in sodium sulfate solutions the results were not clear (depending on the pH, surface condition). The magnetic material exhibited a much higher resistance in the solution of NaH2PO4 in comparison with the corrosion resistance in other test solutions.

Název v anglickém jazyce

SOME CORROSION ELECTROCHEMICAL PROPERTIES OF THE Nd-Fe-B TYPE MAGNETIC MATERIAL

Popis výsledku anglicky

Research in the field of magnetic materials based on Nd-Fe-B is focused on the improvement of certain magnetic characteristics by alloying of suitable elements (Co, Dy, Pr, Cu), extending the thermal stability of these permanent magnets, improving their corrosion resistance and the creation of nano-structure modifications. Magnets based on Nd-Fe-B are susceptible to corrosion, especially in humid atmospheres. The corrosion resistance of these magnets is a function of the structure, temperature, degree of environment humidity and Nd-rich phase reactivity. The paper is focused on determining and comparing the corrosion resistance of magnetic material NdPr-FeM-B (produced by powder metallurgy, M = Cu,Co,Al) in several environments. For comparative purposes, unalloyed carbon steel (C ≤ 0,10% wt.) was tested under the same conditions. On the basis of electrochemical polarization measurements there were determined polarization curve, corrosion characteristics and parameters (corrosion potential, polarization resistance, pitting potentials, etc.) of mentioned selected materials in aqueous solutions (Na2SO4, NaH2PO4, NaCl). Salt spray test was also performed with these materials. The heterogeneous structure of magnetic material and uneven and/or localized corrosion was observed using microscopy. In the sodium chloride solution a higher corrosion resistance reached steel in comparison with the magnet, in sodium sulfate solutions the results were not clear (depending on the pH, surface condition). The magnetic material exhibited a much higher resistance in the solution of NaH2PO4 in comparison with the corrosion resistance in other test solutions.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/LO1203" target="_blank" >LO1203: Regionální materiálově technologické výzkumné centrum - Program udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

METAL 2015 : 24th International Conference on Metallurgy and Materials : proceedings of abstracts : June 3rd-5th 2015, Hotel Voroněž I, Brno, Czech Republic, EU

ISBN

978-80-87294-62-8

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

6

Strana od-do

1558-1564

Název nakladatele

Tanger

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

3. 6. 2015

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000374706100253