Effect of magnetization state on the corrosion behaviour of NdFeB permanent magnets

► Impact of magnetization state of NdFeB magnets on their corrosion. ► Free corrosion in low concentrated H 2SO 4: mechanical degradation. ► Anodic polarization: magnetic field reduces current density. ► Magnetic field localizes corrosion attack. ► Pseudo-passive behaviour at high anodic potentials....

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Bibliographic Details
Published in:Corrosion science 2011-09, Vol.53 (9), p.2843-2852
Main Authors: Sueptitz, Ralph, Tschulik, K., Uhlemann, M., Katter, M., Schultz, L., Gebert, A.
Format: Article
Language:English
Subjects:
A. Acid solutions
Anodic
Applied sciences
B. Polarization
B. Potentiostatic
C. Acid corrosion
Corrosion
Corrosion effects
Corrosion environments
Exact sciences and technology
Iron
Localization
Magnetization
Metals. Metallurgy
Permanent magnets
Polarization
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Summary:► Impact of magnetization state of NdFeB magnets on their corrosion. ► Free corrosion in low concentrated H 2SO 4: mechanical degradation. ► Anodic polarization: magnetic field reduces current density. ► Magnetic field localizes corrosion attack. ► Pseudo-passive behaviour at high anodic potentials. The corrosion behaviour of uncoated NdFeB permanent magnets in the non-magnetized and magnetized state was comparatively investigated in H 2SO 4 solutions by potentiodynamic and potentiostatic polarization experiments. Depth profiles of the corroded surfaces were recorded and an effect of magnetization on the localization of the corrosion attack was identified. The anodic behaviour is discussed on the basis of previously reported results on the corrosion of neodymium and iron and on basis of the magnetic forces acting on the electrochemical system.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2011.05.022