Preparation method of super-strong corrosion resisting neodymium-iron-boron magnet

Abstract

The invention discloses a preparation method of a super-strong corrosion resisting neodymium-iron-boron magnet. The preparation method comprises the following steps: 1) preparing a master alloy into a neodymium-iron-boron ingot alloy through an ingot casting process or preparing the master alloy into a neodymium-iron-boron rapid-hardening slice through a rapid-hardening slice manufacturing process; 2) implementing hydrogen decrepitation or mechanical disruption on the master alloy, and then preparing powder through airflow milling or ball milling; 3) carrying out oil removal on the master alloy powder through an oil removal liquid, and activating through an activating liquid; 4) adding the activated master alloy powder into a plating solution, electroplating copper, and drying through a vacuum drying machine; 5) compressing and moulding the dried powder in a magnetic field; 6) sintering in a high-vacuum sintering furnace to obtain a sintered magnet; and 7) carrying out oil removal on the surface of the magnet and activating, and then electroplating copper. The prepared neodymium-iron-boron magnet disclosed by the invention is remarkably high in corrosion resistance and strong in binding force between plating layer and substrate; and the process is simple and applicable to mass production.

Description

technical field [0001] The invention relates to a preparation method of a super-strong corrosion-resistant NdFeB magnet. Background technique [0002] NdFeB permanent magnet material has been developed since the mid-to-late 1980s. Due to its excellent magnetic properties and good performance-price ratio, it is a new material encouraged by the state and has become a popular choice for various industries in the national economy, especially the electronics and automobile industries. An irreplaceable basic material with a wide variety, widely used in many fields such as electronics, automobiles, computers, electricity, machinery, energy, environmental protection, national defense, medical equipment, etc. Products drive the development of various industries. [0003] As an important functional material, NdFeB rare earth permanent magnet material has played a significant role in various aspects. However, due to the strong chemical activity of Nd in NdFeB permanent magnets, it is...

AI Technical Summary

Problems solved by technology

According to this requirement, various film-forming methods such as electroplating, electroless plating, chemical conversion film, electrophoresis, spray coating, evaporation and ion plating have been used for this purpose, but these methods have not yet solved this problem well. For example, organic coatings on the surface of magnets have requirements for the working environment, and the corrosion resistance time is not long; during aqueous electroplating, neodymium is easily oxidized and hydrogen exists in the coating to cause hydrogen embrittlement; production management and process maintenance of electroless plating are difficult Therefore, economical and effective anti-corrosion treatment methods are still one of the focuses of research and development.