Multilayer nickel plating and hydrogen removing technology for neodymium-iron-boron permanent magnet material

Abstract

The invention provides a multilayer nickel plating and hydrogen removing technology for a neodymium-iron-boron permanent magnet material. According to the multilayer nickel plating and hydrogen removing technology for the neodymium-iron-boron permanent magnet material, multilayer nickel electroplating is conducted through a unique pretreatment technology, material corrosion generated due to the fact that active metal neodymium is quickly oxidized to be darkened in the air can be effectively prevented, then a vacuum hydrogen removing method is conducted, hydrogen atoms permeating into metal lattices of the neodymium-iron-boron permanent magnet material can be effectively removed, the hydrogen removing effect and efficiency are greatly improved, the condition that the residual hydrogen atomsin the material and permeating hydrogen in the electroplating process bring large hydrogen embrittlement hidden dangers to the product is prevented, not only is the problem that the bonding force ofan electroplating layer of the neodymium-iron-boron permanent magnet material is poor solved, but also the problems that the corrosion resistance of a neodymium-iron-boron permanent magnet alloy magnetic steel product is low, and parts generate hydrogen embrittlement pulverization are solved, and the service life of the parts is prolonged.

Description

technical field [0001] The invention belongs to the technical field of a nickel-plating process for NdFeB materials, and in particular relates to a multilayer nickel-plating and dehydrogenation process for NdFeB permanent magnet materials. Background technique [0002] Sintered NdFeB permanent magnet materials have excellent magnetic properties and can be widely used in electronics, electricity, machinery, medical and other fields. They are often used in permanent magnet motors, magnetic separators, disk drives, and magnetic resonance imaging equipment. First of all, NdFeB materials contain a large amount of rare earth element neodymium (Nd). Due to the very active chemical properties of Nd metal, it quickly oxidizes and darkens in the air, reacts slowly in cold water, and reacts rapidly in hot water, causing chemical corrosion of the material. , directly affects the function and service life of the product, so the corrosion resistance of NdFeB permanent magnet materials mus...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is to provide a multi-layer nickel plating and hydrogen removal process for NdFeB permanent magnet materials. The present invention uses a unique pretreatment process and multi-layer nickel plating to effectively prevent the active neodymium metal from rapidly Material corrosion caused by oxidation and darkening, and then the method of vacuum dehydrogenation can effectively remove hydrogen atoms infiltrated into the metal lattice of NdFeB permanent magnet materials, greatly improve the effect and efficiency of dehydrogenation, and prevent residual hydrogen atoms and The hydrogen permeation in the electroplating process brings great hidden dangers of hydrogen embrittlement to the product, which not only solves the problem of poor bonding force of the electroplating layer of NdFeB permanent magnet materials, but also improves the corrosion resistance of NdFeB permanent magnet alloy magnet products Reduce the problem of hydrogen embrittlement and pulverization of parts, prolong the service life of parts

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