Preparation method of neodymium-iron-boron magnet with corrosion resistance

Abstract

The invention relates to the field of neodymium-iron-boron magnets, in particular to a preparation method of a neodymium-iron-boron magnet with corrosion resistance. The preparation method comprises the following steps that 1, surface impurity removal is carried out, particularly, the surface of the neodymium-iron-boron magnet is cleaned, and after surface impurities are removed, drying treatmentis carried out; 2, a corrosion-resistant coating is prepared; 3, coating treatment is carried out, particularly, a neodymium-iron-boron magnet blank is preheated, and then the surface of the neodymium-iron-boron magnet is coated with the prepared corrosion-resistant coating at the high temperature; and 4, curing treatment is carried out, and particularly the neodymium-iron-boron magnet coated withthe corrosion-resistant coating is placed in a drying oven for curing treatment. The preparation method is simple and easy to operate, can meet multiple function requirements of various permanent magnet motor fields for neodymium-iron-boron magnets, and is wider in application range.

Description

technical field [0001] The invention relates to the field of neodymium-iron-boron magnets, in particular to a preparation method of an anti-corrosion neodymium-iron-boron magnet. Background technique [0002] NdFeB magnets (chemical name NdFeB) belong to the third generation of rare earth magnets. Because of their high remanence, high coercive force and high magnetic energy product, they are widely used in new energy electric vehicles, magnet motors for wind power generation, magnetic levitation, Drones and many other sunrise industries. Although NdFeB magnets have excellent magnetic properties, their corrosion resistance is poor. Therefore, in the prior art, a protective layer is usually coated on the surface of NdFeB magnets to avoid the reduction of their magnetic properties due to magnet corrosion. Extend its service life. [0003] At present, there are many anti-corrosion methods for NdFeB permanent magnets. The traditional method is to directly plate nickel, zinc or ...

AI Technical Summary

Problems solved by technology

Although NdFeB magnets have excellent magnetic properties, their corrosion resistance is poor. Therefore, in the prior art, a protective layer is usually coated on the surface of NdFeB magnets to avoid the reduction of their magnetic properties due to magnet corrosion. prolong its service life

[0003] At present, there are many anti-corrosion methods for NdFeB permanent magnets. The traditional method is to directly plate nickel, zinc or nickel-copper-nickel composite layers on the surface of NdFeB magnets by wet processes such as electroplating or chemical plating. The liquid prepared by this process is easy to penetrate into the internal pores of NdFeB magnets, which will cause accelerated corrosion of the magnets.