Neodymium iron boron magnet and neodymium iron boron magnet surface plating method

Abstract

The invention provides a neodymium iron boron magnet with the surface plated with an anti-corrosion layer. The neodymium iron boron magnet comprises a neodymium iron boron magnet body, a multi-arc ionclad layer compounded on the surface of the neodymium iron boron magnet body, and a magnetron sputtering clad layer compounded on the surface of the multi-arc ion clad layer. The invention further provides a method for neodymium iron boron magnet surface plating. Multi-arc ion plating is only adopted in the magnet surface firstly, bottoming flattening is conducted on the magnet surface, the manner of secondary plating through magnetron sputtering is adopted, the multi-arc plating efficiency is high, good film combining and magnetron sputtering film density are effectively combined, the density of the clad layer is improved, the anti-corrosion performance of the film is improved, and the neodymium iron boron magnet with the surface plated with the anti-corrosion layer is obtained. The provided method for neodymium iron boron magnet surface plating, the technology is simple, and the method is suitable for large-scale industry production.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and relates to an NdFeB magnet and a method for coating the surface of an NdFeB magnet, in particular to a NdFeB magnet coated with an anti-corrosion layer on the surface and a method for coating the surface of an Nd-Fe-B magnet with an anti-corrosion layer . Background technique [0002] Permanent magnets are hard magnets, magnets that can maintain their magnetism for a long time, and are not easy to lose their magnetization or be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. Hard magnets can be divided into natural magnets and artificial magnets. Artificial magnets mean that by synthesizing alloys of different materials, the same effect as natural magnets (magnets) can be achieved, and the magnetic force can also be improved. So far, it has developed to the third generation of NdFeB permane...

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Problems solved by technology

However, R-Fe-B rare earth sintered magnets are very easy to rust, and the method of improving corrosion resistance mainly adopts various surface treatments, such as water electroplating, NiCuNi, Zn, epoxy, etc., but these electroplating methods have an impact on the environment. There is a lot of water treatment pressure, especially the existing electroplating process, which is a metal electrodeposition process including liquid phase mass transfer, electrochemical reaction and electrocrystallization. However, NdFeB is a very easy to corrode metal. During the process, it will be corroded by the acidity and alkalinity of the electrolyte, and there will also be electrochemical corrosion, so the surface of the magnet will become very loose due to corrosion, so the bonding force between the coating and the magnet is relatively poor.

[0003] In recent years, the method of vacuum plating has been gradually used on NdFeB magnets. The commonly used vacuum plating includes vacuum evaporation, magnetron sputtering and multi-arc ion plating, etc. The strength is poor, and there is insufficient corrosion resistance; the use of magnetron sputtering coating, due to the low efficiency of magnetron sputtering, is not suitable for low-cost mass production, etc.; and the use of multi-arc ion coating, due to the existence of multi-arc ion coating Large particles cannot meet the corrosion resistance requirements of NdFeB magnets; in order to solve the above-mentioned defects of vacuum plating, multi-arc ion plating and magnetron sputtering are used in the prior art for mixed coating or magnetron sputtering, mixed Plating and magnetron sputtering plating, but there are still defects such as cumbersome steps, high equipment structure requirements, and fundamental problems that cannot be solved

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