Structural and Corrosion Properties of Al-Zn Protective Coating for Nd-Fe-B Permanent Magnets

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F11%3A86081144" target="_blank" >RIV/61989100:27360/11:86081144 - 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

Structural and Corrosion Properties of Al-Zn Protective Coating for Nd-Fe-B Permanent Magnets

Popis výsledku v původním jazyce

The low corrosion resistance of Nd-Fe-B magnets in humid environments determines the necessity for their protection with anticorrosive coatings. In the present work, the microstructure and compositions of Nd-Fe-B-based magnet produced by powder-metallurgy and Al-Zn protective coating applied by cold gas-dynamic sputtering on the magnet surface were studied by optical and electron microscopy and EDS microanalysis. The base material was formed by sintered (polyhedron) grains of the principal Nd2Fe14B phase and it contains pores and minority phases. The fractographic analysis confirmed intercrystalline brittle fracture. The distribution of elements along the coating thickness was studied by glow-discharge spectroscopy. On the basis of potentiodynamic polarization method, the corrosion parameters of stated materials, commercially zinc-coated steel, zinc and aluminium were determined and compared, especially with respect to pitting corrosion in NaCl water solution. Protective coatings were

Název v anglickém jazyce

Structural and Corrosion Properties of Al-Zn Protective Coating for Nd-Fe-B Permanent Magnets

Popis výsledku anglicky

The low corrosion resistance of Nd-Fe-B magnets in humid environments determines the necessity for their protection with anticorrosive coatings. In the present work, the microstructure and compositions of Nd-Fe-B-based magnet produced by powder-metallurgy and Al-Zn protective coating applied by cold gas-dynamic sputtering on the magnet surface were studied by optical and electron microscopy and EDS microanalysis. The base material was formed by sintered (polyhedron) grains of the principal Nd2Fe14B phase and it contains pores and minority phases. The fractographic analysis confirmed intercrystalline brittle fracture. The distribution of elements along the coating thickness was studied by glow-discharge spectroscopy. On the basis of potentiodynamic polarization method, the corrosion parameters of stated materials, commercially zinc-coated steel, zinc and aluminium were determined and compared, especially with respect to pitting corrosion in NaCl water solution. Protective coatings were

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

<a href="/cs/project/ED0040%2F01%2F01" target="_blank" >ED0040/01/01: Regionální materiálově technologické výzkumné centrum</a><br>

Návaznosti

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

Rok uplatnění

2011

Kód důvěrnosti údajů

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

Název periodika

Hutnické listy

ISSN

0018-8069

e-ISSN

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Svazek periodika

64

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

7

Strana od-do

59-65

Kód UT WoS článku

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EID výsledku v databázi Scopus

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