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Effects of bias voltage on coating structures and anticorrosion performances of PA-PVD al coated NdFeB magnets

Journal of Rare Earths 2021年第6期39卷 703-711,I0004页

作者： Yujie Cao Pengjie Zhang Wei Sun Weifeng Zhang Hanzhong Wei Jiquan Wang Bingshan Li Xiaofei Yi Guangqing Xu Yucheng Wu School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Rare Earth Permanent Magnet Materials Earth-Panda Advance Magnetic Material Co.Ltd.Hefei 231500China BGRIMM Magnetic Materials and Technology(Fu Yang)Co. Ltd.Fuyang 236000China BGRIMM Technology Group Co. Ltd.Beijing 102600China

al coated NdFeB magnets were prepared by plasma-assisted-physical-vapor-deposition(PA-PVD)method fo r enhancing the corro sion *** rphologies and structures were characterized by an Xray diffractometer and a scanning electron *** behaviors of the samples with different bias voltages were studied by electrochemical methods and neutral salt spray test,*** bias voltage during the deposition process was optimized according to the coating structures and corrosion *** density and flatness of al coating increase with increasing the bias voltage,and at the same time the thickness *** coating density and thickness turn to be stable when bias voltage is 1800 ***,the corrosion behaviors of PA-PVD al coatings in different media,such as NaOH,HNO_(3) and NaCl solutions,were *** self-corrosion potentials(E_(corr)) of PA-PVD al coatings almost keep constant in NaOH and HNO_(3) solutions with diffe rent ***,the self-corrosion current densities(J_(corr)) decrease with the increasing concentrations.E_(corr) shifts to negative potential and J_(corr)decreases gradually when increasing the concentration of NaCl *** corrosion mechanisms of al coatings are discussed based on the corrosion behaviors in different media.

关键词： Physical vapor deposition Plasma assistance al coating Sintered NdFeB Corrosion behavior Rare earths

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Effects of additive NaI on electrodeposition of al coatings in alCl_(3)-NaCl-KCl molten salts

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Frontiers of Chemical Science and Engineering 2021年第1期15卷 138-147页

作者： Tianyu Yao Haiyan Yang Kui Wang Haiyan Jiang Xiao-Bo Chen Hezhou Liu Qudong Wang Wenjiang Ding National Engineering Research Center of Light alloy Net Forming Shanghai Jiao Tong UniversityShanghai 200240China The State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China School of Engineering RMIT UniversityMelbourneVIC 3000Australia

Effects of NaI as an additive on electrodeposition of al coatings in alCl_(3)-NaCl-KCl(80-10-10 wt-%)molten salts electrolyte at 150°C were investigated by means of cyclic voltammetry,chronopotentiometry,scanning electron microscopy and X-ray diffraction(XRD).Results reveal that addition of NaI in the electrolyte intensifies cathodic polarization,inhibits growth of al deposits and increases number density of charged *** electrodeposition of al coatings in the alCl_(3)-NaCl-KCl molten salts electrolyte proceeds via three-dimensional instantaneous nucleation which however exhibits irrelevance with *** deposition results indicate that NaI could facilitate the formation of uniform al deposits.A compact coating consisting of al deposits with an average particle size of 3μm was obtained at a current density of 50 mA∙cm^(−2) in alCl_(3)-NaCl-KCl molten salts electrolyte with 10 wt-%*** analysis confirmed that NaI could contribute to the formation of al coating with a preferred crystallographic orientation along(220)plane.

关键词： NaI additive electrodeposition molten salts al coating

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

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Journal of Rare Earths 2021年第10期39卷 1238-1245,I0003页

作者： Jun Huang Qing Liu Zhenyu Yang Guangqing Xu Pengjie Zhang Jun Lv Wei Sun Bingshan Li Dongmei Wang Yucheng Wu School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China China International S&T Cooperation Base for Advanced Energy and Environmental Materials Hefei University of TechnologyHefei 230009China Key Laboratory of Advanced Functional Materials and Devices of Anhui Province Anhui Provincial International S&T Cooperation Base for Advanced Energy MaterialsHefei University of TechnologyHefei 230009China BGRIMM Technology Group Co. Ltd.Beijing 102600China National Engineering Research Center for Magnetic Materials Beijing 102600China

al coated NdFeB magnets obtained by vacuum evaporation technique were densified by high energy ball milling *** surface morphology,metal composition and micro structure of the coatings were characterized by scanning electron microscopy,X-ray diffraction and X-ray photoelectron spectroscopy,*** anticorrosive properties were investigated by potentiodynamic polarization curves and neutral salt spray *** 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 *** 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

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