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Neodymium-iron-boron magnet surface composite corrosion-resistant coating and preparation method thereof

A surface compounding, NdFeB technology, applied in the manufacture of permanent magnets, magnets, magnetic objects, etc., can solve the problems of reduced performance and life, complicated process, high cost, etc., to achieve extended service life, simple preparation process, and convenient operation Effect

Inactive Publication Date: 2020-02-21
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] As a new generation of permanent magnet materials, sintered NdFeB magnets have become the most widely used permanent magnet materials in the world today with the continuous innovation of production technology and the increasing demand for permanent magnet materials. However, due to the The unavoidable existence of neodymium-rich and equal low-potential and easy-to-corrosion phases in the crystal phase has led to the reduction of its working performance and service life in high temperature, humid heat, and corrosive substance environments. Traditional alloying methods, electroplating, chemical plating, and ion plating And other anti-corrosion processes, there are problems such as complex process, high cost, and large pollution

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  • Neodymium-iron-boron magnet surface composite corrosion-resistant coating and preparation method thereof
  • Neodymium-iron-boron magnet surface composite corrosion-resistant coating and preparation method thereof
  • Neodymium-iron-boron magnet surface composite corrosion-resistant coating and preparation method thereof

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Embodiment 1

[0045] This embodiment prepares cold-sprayed aluminum-based corrosion-resistant coatings, that is, cold-sprays aluminum coatings on the surface of NdFeB magnets without passivation and sealing treatment; the specific preparation method includes the following steps:

[0046] (1) Surface treatment of NdFeB substrate: select N42 NdFeB substrate with a thickness of 5mm and a diameter of 25mm, perform sandblasting and degreasing treatment on the surface, and then perform ultrasonic cleaning with absolute ethanol, clean and dry Finally, seal it with a sample bag to avoid surface oxidation.

[0047] (2) Preparation and processing of aluminum powder: ①The aluminum ingot is melted into molten aluminum in the melting furnace; ②The molten aluminum is introduced into the atomization furnace, and when the temperature reaches 900-950°C, it is sprayed in the atomization chamber under the action of airflow and pressure Atomized into small droplets, the small droplets are cooled under the protec...

Embodiment 2

[0050] In this embodiment, cold sprayed aluminum-based composite anti-corrosion coatings are prepared, that is, from the surface of the NdFeB magnet to the outside, the cold sprayed aluminum coating, the aluminum oxide passivation layer obtained by surface passivation treatment, and the sealing ceramic paint layer are sequentially included.

[0051] In this embodiment, the preparation method of cold-sprayed aluminum-based composite corrosion-resistant coating specifically includes the following steps:

[0052] (1) Surface treatment of NdFeB substrate; select N42 NdFeB substrate with a thickness of 5mm, and use acid corrosion method to roughen its surface, which specifically includes the following steps: first degreasing the surface, and then Ultrasonic cleaning in water and ethanol for 5 minutes; then soaking in 2.5% nitric acid solution for 1 min for nitric acid acid corrosion, and then soaking in 2% citric acid solution for 2 min for citric acid activation; finally Ultrasoni...

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Abstract

The invention discloses a neodymium-iron-boron magnet surface composite corrosion-resistant coating and a preparation method thereof. The composite corrosion-resistant coating sequentially comprises acold spraying aluminum coating, an aluminum oxide passivation layer obtained through surface passivation treatment and a hole sealing ceramic paint layer from the surface of a neodymium-iron-boron magnet to the outside. The preparation method comprises the following steps of: (1) surface treatment of a neodymium-iron-boron substrate; (2) treatment of aluminum powder; (3) cold spraying of an aluminum coating; (4) passivation treatment to obtain an aluminum oxide passivation layer; and (5) hole sealing treatment to obtain a hole sealing ceramic paint layer. The prepared neodymium-iron-boron magnet surface composite corrosion-resistant coating has excellent local corrosion resistance, the corrosion-resistant coating is formed by well combining with the neodymium-iron-boron magnet, the defects that a pure aluminum coating is low in strength and hardness and micropores exist in the surface are overcome, and the service life of the corrosion-resistant coating is prolonged when the corrosion-resistant coating is used as a sintered neodymium-iron-boron magnetic material surface corrosion-resistant process.

Description

technical field [0001] The invention relates to the technical field of surface treatment of NdFeB magnetic materials. Specifically, it relates to a composite corrosion-resistant coating on the surface of an NdFeB magnet and a preparation method thereof. Background technique [0002] As a new generation of permanent magnet materials, sintered NdFeB magnets have become the most widely used permanent magnet materials in the world today with the continuous innovation of production technology and the increasing demand for permanent magnet materials. However, due to the The unavoidable existence of neodymium-rich and equal low-potential and easy-to-corrosion phases in the crystal phase has led to the reduction of its working performance and service life in high temperature, humid heat, and corrosive substance environments. Traditional alloying methods, electroplating, chemical plating, and ion plating And other anti-corrosion processes, there are problems such as complex process,...

Claims

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Application Information

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IPC IPC(8): H01F7/02H01F1/057H01F27/23H01F41/02
CPCH01F7/0221H01F1/0577H01F27/23H01F41/026
Inventor 马文高元明白玉董红英张鹏张辰楠齐英伟贾瑞灵
Owner INNER MONGOLIA UNIV OF TECH
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