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| Effects of Ultrasonic Electroless Ni-P Plating on corrosion resistance of Sintered NdFeB Permanent magnets |
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Abstract The effects of Ni-P electroless plating on the corrosion resistance of sintered NdFeB magnets in 40 kHz frequency ultrasonic field were investigated. In the ultrasonic field,the deposition rate and the phosphorus content of plati ng layers were measured,the surface morphology were observed,and the corrosion resistance of Ni-P layers were studied.It was shown that with the increase of ultrasonic power,the deposition rate was increased,and the phosphorus content in plating layers was decreased.Subjected to the ultrasonic field,the electrol ess Ni-P layer got finer and more compact.With the ultrasonic field,the corros ion resistance of electroless Ni-P layers was improved effectively.
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Received: 25 January 2005
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