吸氢对钕铁硼永磁体磁特性和镀层结合强度的影响

The Effect of Hydrogen Absorption on Magnetic Properties of NdFeB and the Adhesive Strength of its Electrodeposited Coating

烧结钕铁硼永磁合金具有吸氢的性质。磁体吸氢后,其磁特性和镀层结合强度都会明显降低,甚至会失去使用功能。磁体在电镀前处理过程中以及在电镀或化学镀等过程中须注意避氢。分析了磁体吸氢和析氢的过程与机理,提出了避氢的措施。实施结果表明:镀层结合强度明显提高,而且磁体表磁力或磁通量未见异常降低。

Sintered NdFeB magnet absorbs hydrogen . After absorption of hydrogen the magnetic properties and electroplating strength of NdFeB magnet become weak notably. Hydrogen absorption should be avoided if possible during the process of pre-treatment, electroplating and chemical coating of NdFeB magnet. The mechanism of hydrogen absorption and hydrogen release of NdFeB magnet were analyzed and the prevention measure was given. The experiment results show that the adhesive strength of electrodeposited coating has distinct enhancement. There is no decrease of its magnetic performance.