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Fabrication and properties of micro-arc oxidation coatings on sintered NdFeB permanent magnets
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Nanchang Hangkong University,School of Materials Science and Engineering,Nanchang Hangkong University,School of Materials Science and Engineering,Nanchang Hangkong University,The Institute for Rare Earth Magnetic Materials and Devices,Jiangxi University of Science and Technology,Center for Biomedical Materials and Engineering,Harbin Engineering University,Center for Biomedical Materials and Engineering,Harbin Engineering University,Center for Biomedical Materials and Engineering,Harbin Engineering University

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    Abstract:

    In order to improve the corrosion resistance of the sintered NdFeB permanent magnets, Al2O3 ceramic coatings were prepared by a two-step micro-arc oxidation process in an aluminate solution. During the micro-arc oxidation process, the voltage-time curve could be divided into four regions consistent with the valve metals. The coating exhibited a typical micro-arc oxidation porous surface with the thickness of ~5 μm, and was only composed of Al2O3 crystalline phase with some Fe elements and a few Nd and P elements. The surface roughness of coated NdFeB magnets was higher than that of uncoated sample, while the corrosion resistance was enhanced by one order of magnitude. Unfortunately, the magnetic properties (remanence and maximum energy product) of coated NdFeB sample decreased in different degrees.

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[Jilin Xu, Qifei Xiao, Dingding Mei, Zhenchen Zhong, Yunxiang Tong, Yufeng Zheng, Li Li. Fabrication and properties of micro-arc oxidation coatings on sintered NdFeB permanent magnets[J]. Rare Metal Materials and Engineering,2018,47(4):1059~1063.]
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History
  • Received:September 06,2016
  • Revised:April 18,2018
  • Adopted:November 11,2016
  • Online: May 31,2018

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