Densification and anticorrosion performances of vacuum evaporated aluminium coatings on NdFeB magnets  

作　　者：Jun Huang Qing Liu Zhenyu Yang Guangqing Xu Pengjie Zhang Jun Lv Wei Sun Bingshan Li Dongmei Wang Yucheng Wu 

机构地区：[1]School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China [2]China International S&T Cooperation Base for Advanced Energy and Environmental Materials,Hefei University of Technology,Hefei 230009,China [3]Key Laboratory of Advanced Functional Materials and Devices of Anhui Province,Anhui Provincial International S&T Cooperation Base for Advanced Energy Materials,Hefei University of Technology,Hefei 230009,China [4]BGRIMM Technology Group Co.,Ltd.,Beijing 102600,China [5]National Engineering Research Center for Magnetic Materials,Beijing 102600,China

出　　处：《Journal of Rare Earths》2021年第10期1238-1245,I0003,共9页稀土学报（英文版）

基　　金：supported by the Base of the Key Technologies R & D Program of Anhui Province (1704c0402195);the Fundamental Research Funds for the Central Universities (PA2019GDPK0043,JZ2019HGBZ0142,JZ2019YYPY0291)。

摘　　要：Al coated NdFeB magnets obtained by vacuum evaporation technique were densified by high energy ball milling method.The surface morphology,metal composition and micro structure of the coatings were characterized by scanning electron microscopy,X-ray diffraction and X-ray photoelectron spectroscopy,respectively.The anticorrosive properties were investigated by potentiodynamic polarization curves and neutral salt spray test.The pores in the Al coatings of columnar crystals(Al) induced by the evaporation technique,were apparently filled in the following ball milling process,leading to the densification of Al coatings and the evident improvement of the anticorrosive performances.When treated with ball milling for 30 min,the sample achieves the best anticorrosive performances with the self-corrosion potential of-0.87 V,self-corrosion current density of 1.65 μA/cm^(2) and the neutral salt spray(NSS) time of 144 h(red rust).The improvement of the anticorro sive performances of vacuum evaporated Al coating mainly lies in the densification effect of the coating,which depends on different loading conditions of ball milling process.

关 键 词：Sintered NdFeB magnet Al coating Anticorrosive performances Vacuum evaporation DENSIFICATION Rare earths 

分 类 号：TB306[一般工业技术—材料科学与工程]