Surface hot dipping and pore sealing method of neodymium-iron-boron permanent magnet material

Abstract

A surface hot dipping and pore sealing method of a neodymium-iron-boron permanent magnet material belongs to the technical field of surface corrosion protection of neodymium-iron-boron permanent magnet materials. The method comprises the steps of heating a neodymium-iron-boron permanent magnet at 120-240 DEG C for 1-2.5h; and impregnating the heated neodymium-iron-boron permanent magnet in a pore sealing agent and sealing micropores on the surface of the neodymium-iron-boron permanent magnet, and taking out untill the surface temperature of the neodymium-iron-boron permanent magnet is lower than 40 DEG C. The pore sealing agent is methyl oleate and / or ethyl oleate, and the ratio of methyl oleate to ethyl oleate is 1:1 or 1:2 when the pore sealing agent employs a mixture of methyl oleate and ethyl oleate. By adoption of the pore sealing method, after the heated neodymium-iron-boron permanent magnet contacts the low-temperature pore sealing agent, the volume of the surface micropores is reduced and the pressure inside the micropore is reduced, so that the pore sealing agent is sucked into the micropores and plays a role in sealing pores of the neodymium-iron-boron permanent magnet, and the corrosion reduction of acidic and basic solutions to the magnet surface is facilitated in an electroplating process. The neodymium-iron-boron permanent magnet subjected to sealing pore is uniform in surface structure, and ensures the bonding force and the corrosion resistant performance of an electroplating layer in the subsequent electroplating process.

Description

technical field

[0001] The invention belongs to the technical field of surface anticorrosion of NdFeB permanent magnet materials, and in particular relates to a surface heat-dip sealing hole treatment method of NdFeB permanent magnet materials. technical background

[0002] Since 1983, Japan's Sumitomo Special Metals Sagawa and others first produced Nd 2 Fe 14 Since the sintered NdFeB permanent magnet materials based on B compound, the development of NdFeB permanent magnet materials has been very rapid. It effectively promotes the development of modern science and technology and information industry, and provides a material guarantee for the emergence of new industries. At present, the application fields of sintered NdFeB permanent magnet materials mainly include new fields such as electronic information, automobile industry, medical equipment, energy transportation, industrial power-saving energy motors, energy-saving and environmental protection home appliances, and gree...

Images