Effect of corrosion protection of sol enhanced cooperating coatings on sintered NdFeB permanent magnets

Liu, F; Li, Q; Li, L Q; Wang, S Y; Zhang, H X

doi:10.1179/0020296712z.00000000034

Cited by 2 publications

(1 citation statement)

References 39 publications

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“…[23][24][25][26][27] In our laboratory, we also have made several kinds of surface modification studies for NdFeB and shown good corrosion protection for NdFeB. [28][29][30][31][32][33] And the electrodeposition technology is one of the most popular methods. As an important electrochemical research method, potentiodynamic electrodeposition could be used to research the characteristics and mechanism of electrode reaction and electrode process kinetics parameters.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ni–Co alloy coating on sintered NdFeB magnet by potentiodynamic electrodeposition

Tan

She

et al. 2016

Materials Science and Technology

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A protective Ni–Co alloy coating was successfully prepared on sintered neodymium–iron–boron (NdFeB) magnet via potentiodynamic electrodeposition in this paper. The microstructure and surface morphology analysis of Ni–Co alloy coating showed that the surface morphologies were quite compact and more uniform than that prepared by direct current (DC) electrodeposition; significantly, the chemical composition analysis indicated that the content of Co in the alloy coatings amounted to 33–34 wt-. Potentiodynamic polarisation and long term immersion test results revealed that the Ni–Co alloy coating could supply excellent corrosion protection for NdFeB substrate in 3.5 wt- NaCl solution. Overall, the Ni–Co alloy coating with higher Co content prepared by potentiodynamic electrodeposition exhibited better corrosion protection for sintered NdFeB magnet compared with that prepared by DC electrodeposition.

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Section: Introductionmentioning

confidence: 99%

Preparation of Ni–Co alloy coating on sintered NdFeB magnet by potentiodynamic electrodeposition

Tan

She

et al. 2016

Materials Science and Technology

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Corrosion Resistance Analysis of Sintered NdFeB Magnets Using Ultrasonic-Aided EDM Method

Wei

et al. 2014

J. of Materi Eng and Perform

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Sintered neodymium-iron-boron (NdFeB) permanent magnets are widely used in many fields because of their excellent magnetic property. However, their poor corrosion resistance has been cited as a potential problem that limits their extensive application. This paper presents an experimental investigation into the improvement of surface corrosion resistance with the ultrasonic-aided electrical discharge machining (U-EDM) method. A scanning electron microscope was used to analyze the surface morphology of recast layers formed through the EDM and U-EDM processes. The chemical structure and elements of these recast layers were characterized using x-ray diffraction and energy dispersive spectroscopy. Corrosion resistance was also studied by means of potentiodynamic polarization, electrochemical impedance spectroscopy, and immersion tests in 0.5 mol/L H 2 SO 4 solution. Experimental results show that an amorphous structure was formed in the recast layer during the EDM and U-EDM processes and that this structure could improve the corrosion resistance of sintered NdFeB magnets. Moreover, the corrosion resistance of U-EDM-treated surface was better than that of the EDM-treated surface.

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Effect of corrosion protection of sol enhanced cooperating coatings on sintered NdFeB permanent magnets

Cited by 2 publications

References 39 publications

Preparation of Ni–Co alloy coating on sintered NdFeB magnet by potentiodynamic electrodeposition

Preparation of Ni–Co alloy coating on sintered NdFeB magnet by potentiodynamic electrodeposition

Corrosion Resistance Analysis of Sintered NdFeB Magnets Using Ultrasonic-Aided EDM Method

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