Jointly supported by the National Natural Scien

摘要:<正>Jointly supported by the National Natural Science Foundation of China,Ministry of Science and Technology and Chinese Academy of Sciences,Ma Xucun's group in CAS Institute of Physics Neodymium Magnets
http://www.999magnet.com/products/110-sintered-neodymium-magnets and Condensed Matter Physics National Lab,in cooperation with Xue Qikun's research team in the Department of Physics of Tsinghua University,studied the super exchange mechanism in cobalt phthalocyanine(CoPc)thin films


关键词:sintered NdFeB permanent magnet; Ni-P/TiO2 composite film; sodium chloride solution; corrosion resistance
摘要:The Ni-P/TiO2 composite film on sintered NdFeB permanent magnet was investigated by X-ray diffraction (XRD),environmental scanning electron microscopy (ESEM),and energy dispersive X-ray spectrometer (EDX). The corrosion resistance of Ni-P/TiO2 film coated on NdFeB magnet,in 0.5 mol/L NaCl solution,was studied by potentiodynamic polarization,salt spray test and electrochemical impedance spectroscopy (EIS) techniques. The self-corrosion current density (icorr) and the polarization resistance (Rp) of Ni-P/TiO2 film are 0.22 μA/cm2 (about 14% of that of Ni-P coating),and 120 kΩ·cm2 (about 2 times of that of Ni-P coating),respectively. The anti-salt spray time of Ni-P/TiO2 film is about 2.5 times of that of the Ni-P coating. The results indicate that Ni-P/TiO2 film has a better corrosion resistance than Ni-P coating,and the composite film increases the corrosion resistance of NdFeB magnet markedly.