Avaliacao da resistencia a corrosao de ima de Nd-Fe-B por meio de ensaio gravimetrico
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2003
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CONFERENCIA SOBRE TECNOLOGIA DE EQUIPAMENTOS, 7.
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Resumo
Nd-Fe-B permanent magnets are highly susceptible to corrosion in aqueous media. Their
excellent magnetic properties, however, make them widely used in applications like electronic
motors. The study of their corrosion behavior is of great interest in order to promote its control
and to widen the application of these magnets in atmospheres of moderate aggressiveness. The
aim of this work was to evaluate the corrosion resistance of a commercial Nd-Fe-B magnet by
means of gravimetric analysis. Magnetized and non-magnetized specimens were immersed in
NaC1 3.5% (w/w) for increasing periods and after each test period (5, 15, 20, 30, 40 and 60 days)
the samples were taken off the solution and weighed. Neutron activation analysis (NAA) of the
corrosion products was used as a complementary technique to determine the iron and
neodymium contents released from each sample. Weight loss results indicated that the magnets
in the magnetized state present lower corrosion resistance than the non-magnetized ones.Nd-Fe-B permanent magnets are highly susceptible to corrosion in aqueous media. Their
excellent magnetic properties, however, make them widely used in applications like electronic
motors. The study of their corrosion behavior is of great interest in order to promote its control
and to widen the application of these magnets in atmospheres of moderate aggressiveness. The
aim of this work was to evaluate the corrosion resistance of a commercial Nd-Fe-B magnet by
means of gravimetric analysis. Magnetized and non-magnetized specimens were immersed in
NaC1 3.5% (w/w) for increasing periods and after each test period (5, 15, 20, 30, 40 and 60 days)
the samples were taken off the solution and weighed. Neutron activation analysis (NAA) of the
corrosion products was used as a complementary technique to determine the iron and
neodymium contents released from each sample. Weight loss results indicated that the magnets
in the magnetized state present lower corrosion resistance than the non-magnetized ones.
Como referenciar
OLIVEIRA, M.C.L.; SAIKI, M.; COSTA, I. Avaliacao da resistencia a corrosao de ima de Nd-Fe-B por meio de ensaio gravimetrico. In: CONFERENCIA SOBRE TECNOLOGIA DE EQUIPAMENTOS, 7., 9-12 set, 2003, Florianopolis, SC. Anais... Disponível em: http://repositorio.ipen.br/handle/123456789/16458. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.