Corrosion behavior of NdFeB permanent magnet in two neutral environments
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2021
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INTERNATIONAL CORROSION CONGRESS, 21st; INTERNATIONAL CORROSION MEETING, 8th
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The NdFeB uncoated magnets have been magnetically characterized by demagnetization
curves and their corrosion behavior have been evaluated (nonmagnetized state) by
accelerated, immersion and electrochemical corrosion tests. The hygrothermal corrosion
resistance was evaluated by: high accelerated stress test (HAST) and bulk corrosion test
(BCT). The immersion tests were performed in ultrapure water with or without addition of
chloride ions. The electrochemical tests, open circuit potential (OPC) and electrochemical
impedance spectroscopy (EIS) were carried out in two neutral solutions (NaCl and Na2SO4),
and on the two distinct surfaces of cubic magnets, i.e. parallel and perpendicular (pole) to the
crystallographic c-axis of aligned ferromagnetic grains. Both accelerated tests presented
weight loss below 1.0 mg/cm2 (BCT grade A). The chloride ions additions in immersion tests
caused differential aeration corrosion. The EIS tests carried out in NaCl solution were more
aggressive than in Na2SO4 solution, and indicated a different corrosion behavior between the
parallel and pole faces evidenced by the response of the Nyquist diagrams.
Como referenciar
YOSHIKAWA, DANIEL S.; SANTOS, CELIA A.L.; MARTIN, RAMON V.; ALMEIDA, NEUSVALDO L. de; FARIA, RUBENS N.; CARVALHO, MATHEUS A.; WENDHAUSEN, PAULO A.; LANDGRAF, FERNANDO J. Corrosion behavior of NdFeB permanent magnet in two neutral environments. In: INTERNATIONAL CORROSION CONGRESS, 21st; INTERNATIONAL CORROSION MEETING, 8th, July 20-23, 2021, Online. Anais... Rio de Janeiro, RJ: Associação Brasileira de Corrosão - ABRACO, 2021. Disponível em: http://repositorio.ipen.br/handle/123456789/33240. 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.