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MATERIAL SCIENCE
Название Investigation of the inherent magnetic field influence on corrosion resistance of Nd – Fe – B permanent magnets
DOI 10.17580/nfm.2018.02.04
Автор Tarasov V. P., Gorelikov E. S., Kutepov A. V., Khokhlova O. V.
Информация об авторе

National University of Science and Technology “MISiS”, Moscow, Russia:

V. P. Tarasov, Professor, Head of the Department of Non-Ferrous Metals and Gold
E. S. Gorelikov, Deputy Director of Engineering Center and Industrial Technology
A. V. Kutepov, Chief Engineer of Engineering Center and Industrial Technology
O. V. Khokhlova, Assistant of Department of Non-Ferrous Metals and Gold, e-mail: hohlova.oksana.v@gmail.com

Реферат

Nowadays permanent magnets of Nd – Fe – В system are widely used in various branches of production. The trend has been toward increase of the world consumption of the magnets in the making of advanced technology gadgets (smartphones, navigators, television sets, and computers). However, this magnet material can not be always applied in the special-purpose devices because of its low corrosion resistance and poor temperature stability. To elongate service life of the magnets it is necessary to deposit a protective coating based on nickel, zinc, copper as well as on the combination of other substances (phosphate, epoxy resin). The given paper is dedicated to the results of implemented comparative research of corrosion resistance of permanent magnets made of magnetically hard material based on Nd – Fe – В alloy both with metallic anticorrosive coat and without it in a magnetized and non-magnetized state. It has been found that the inherent magnetization influence on the corrosion resistance of PM made of Nd – Fe – В MHM both with metallic anticorrosive coat and without it are of an opposite nature. The corrosion resistance of the samples without coating in the magnetized state has increased by 12%. At the same time, the corrosion resistance of Zn- and Ni-coated samples in the magnetized state has decreased by 40–45%. It is determined that the coating-free magnets are better to be stored and transported in the magnetized condition while the magnets protected by metallic anticorrosive coats need to be stored in the non-magnetized condition.

The work was carried out with the financial support of the Ministry of Education and Science of the Russian Federation in the framework of obligations under the Agreement on the grant No. 14.578.21.0255 of September 26, 2017 (the unique identifier of the agreement RFMEFI57817X0255).

Ключевые слова Rare-earth elements, permanent magnets, corrosion resistance, anticorrosive coat, magnetization, magnetic field
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