phosphating;ultrasonic

关键词:sintered NdFeB magnet;phosphating;ultrasonic

wave;corrosion resistance
摘要:The corrosion behavior of a NdFeB magnet obtained at room

temperature,with and without ultrasonic were investigated.The

corrosion resistance was investigated by neodymium standard state corrosion immersion

tests in 3 wt%neutral NaCl solutions,potentiodynamic polarization

tests and electrochemical impedance spectroscopy(EIS).The

morphology of the conversion coatings on NdFeB surface were

analyzed by scanning electron http://www.999magnet.com/products/112-neodymium-standard-state microscopy(SEM).And the forming

mechanism of coatings was studied by potential-time curves.The

tests of corrosion resistances show that the combination of

phosphating treatment with ultrasonic will further improve the

corrosion resistance of the NdFeB.The SEM also confirms that

phosphating coating under ultrasonic is more homogeneous and

compact.