Preparation method of high corrosion resistant sintered NdFeB magnet

A technology with high corrosion resistance and magnets, which is applied in the manufacture of permanent magnets, inductors/transformers/magnets, coatings, etc., can solve the problems of high bonding force and high corrosion resistance on the surface of sintered NdFeB magnets, and improve the bonding force of the film base , long-term corrosion resistance, good mechanical properties

Inactive Publication Date: 2019-04-26
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a high-corrosion-resistant sintered NdFeB magnet to solve the problems of high bonding force and high corrosion resistance on the surface of the sintered NdFeB magnet proposed in the above-mentioned background technology

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  • Preparation method of high corrosion resistant sintered NdFeB magnet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: A method for preparing a glass coating on the surface of a neodymium iron boron magnet, including the following steps:

[0031] The sintered NdFeB magnets with length, width, and height specifications of 20mm×10mm×3mm were mechanically polished, and then the polished sintered NdFeB magnet was cleaned with acetone solution to make the cleanliness of the sintered NdFeB magnet reach Sa4 level.

[0032] (1) Metal-based alloy coating treatment: the metal-based alloy coating is prepared on the surface of the sintered NdFeB magnet by arc spraying;

[0033] (2) Sealing primer coating treatment: coating siloxane paint on the surface of the metal-based alloy coating to form a closed primer coating;

[0034] (3) Topcoat coating treatment: apply topcoat paint on the surface of the closed primer coating to form a topcoat coating. The topcoat paint is prepared by the mass percentage of nanoparticles and modified acrylic epoxy resin. Nanoparticles The mass percentage of 5% is 5%...

Embodiment 2

[0042] Embodiment 2: A method for preparing a glass coating on the surface of a neodymium iron boron magnet, including the following steps:

[0043] The sintered NdFeB magnets with length, width, and height specifications of 20mm×10mm×3mm were mechanically polished, and then the polished sintered NdFeB magnet was cleaned with an acetone solution to make the cleanliness of the sintered NdFeB magnet reach Sa4 level.

[0044] (1) Metal-based alloy coating treatment: the metal-based alloy coating is prepared on the surface of the sintered NdFeB magnet by arc spraying;

[0045] (2) Sealing primer coating treatment: coating siloxane paint on the surface of the metal-based alloy coating to form a closed primer coating;

[0046] (3) Topcoat coating treatment: apply topcoat paint on the surface of the closed primer coating to form a topcoat coating. The topcoat coating is prepared by the mass percentage of nanoparticles and modified acrylic epoxy resin. The mass percentage is 15%, and the rest...

Embodiment 3

[0054] Embodiment 3: A method for preparing a glass coating on the surface of a neodymium iron boron magnet, including the following steps:

[0055] The sintered NdFeB magnets with length, width, and height specifications of 20mm×10mm×3mm were mechanically polished, and then the polished sintered NdFeB magnet was cleaned with an acetone solution to make the cleanliness of the sintered NdFeB magnet reach Sa4 level.

[0056] (1) Metal-based alloy coating treatment: the metal-based alloy coating is prepared on the surface of the sintered NdFeB magnet by arc spraying;

[0057] (2) Sealing primer coating treatment: coating siloxane paint on the surface of the metal-based alloy coating to form a closed primer coating;

[0058] (3) Topcoat coating treatment: apply topcoat paint on the surface of the closed primer coating to form a topcoat coating. The topcoat coating is prepared by the mass percentage of nanoparticles and modified acrylic epoxy resin. The mass percentage is 25%, and the rest...

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Abstract

The invention discloses a preparation method of a high corrosion resistant sintered NdFeB magnet. The method is characterized by comprising the following steps of (1) metal-based alloy coating treatment: preparing a metal-based alloy coating on the surface of the sintered NdFeB magnet by adopting an arc spraying process; (2) closed primer coating treatment: coating the surface of the metal-based alloy coating with a silicone coating to form a closed primer coating; (3) topcoat coating treatment: coating the surface of the closed primer coating with a topcoat paint to form a topcoat coating prepared by nanometer particles and modified acrylic epoxy resin by mass, wherein the mass percentage of the nanoparticles is 5.25%, and the balance is the modified acrylic acid epoxy resin. The preparation method has high bonding strength and high corrosion resistance.

Description

Technical field [0001] The invention relates to the field of surface protection of magnet materials, in particular to a method for preparing a high corrosion resistance sintered NdFeB magnet. Background technique [0002] Sintered NdFeB magnets (sintered neodymium iron boron magnets) have excellent geomagnetic properties, but the Nd element in the magnet is chemically active, and its standard electrode potential is E 0 (Nd 3+ / Nd)=-2.431V, it is prone to corrosion when exposed to the air or in a humid environment, resulting in poor oxidation and corrosion resistance, which severely limits the application and further development of sintered NdFeB magnets. Therefore, measures must be taken to improve the corrosion resistance of sintered NdFeB magnets in order to expand the application fields of magnets. [0003] Measures to improve the corrosion resistance of sintered NdFeB magnets mainly include the following two. One is the method of adding alloying elements, that is, adding alloyi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02C09D183/08C09D163/10C09D5/08C09D7/61C23C4/08C23C4/131C22C38/28C22C38/22C22C19/07C22C19/05C22C21/00
CPCC08G77/26C08K2003/2213C08K2201/011C09D4/00C09D5/08C09D7/61C09D7/67C09D7/68C09D163/10C09D183/08C22C19/056C22C19/07C22C21/00C22C38/002C22C38/22C22C38/28C23C4/08C23C4/131H01F41/026C08K3/36C08K3/22
Inventor 曹玉杰时宗华赵占中吴玉程黄秀莲刘家琴陈静武衣晓飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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