Preparation method of neodymium iron boron with low cost and high corrosion resistance

A high corrosion resistance and corrosion resistance technology, used in inductor/transformer/magnet manufacturing, magnetic materials, anti-corrosion coatings, etc., can solve the heat resistance, wear resistance and weather resistance of the outer epoxy layer, surface protection Deal with problems such as high cost, poor wear resistance and weather resistance, and achieve the effect of low cost, enhanced bonding strength, and good heat resistance

Active Publication Date: 2020-04-28
ZHEJIANG ZHONGHANG NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing NdFeB rare earth permanent magnet materials use epoxy resin as the matrix as the organic coating for surface protection, which has problems such as poor heat resistance, wear resistance and weather resistance.
Chinese patent CN201510886001.5 discloses a surface treatment method of NdFeB permanent magnet material and its products, by sequentially coating aluminum rare earth alloy on the surface of NdFeB permanent magnet material, then performing ceramic treatment, and then performing electrophoretic coating Epoxy layer to obtain NdFeB permanent magnet materials with high corrosion resistance, but this method is complicated in process, high in surface protection treatment cost, and its outer epoxy layer has relatively poor heat resistance, wear resistance and weather resistance

Method used

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  • Preparation method of neodymium iron boron with low cost and high corrosion resistance
  • Preparation method of neodymium iron boron with low cost and high corrosion resistance

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Effect test

Embodiment 1

[0034] The preparation method of low-cost and high-corrosion-resistant NdFeB in this embodiment comprises the following steps:

[0035] S1 NdFeB pretreatment: use an initial impulse current of 70A to treat the sintered NdFeB magnet for 3 minutes in the titanium salt solution, and then reduce the current to 40A for 40 minutes;

[0036] Preparation of S2 modified coating mixture: Stir and mix fluorine-containing methacrylate, epoxy resin, and vinyl epoxy resin evenly to prepare the main raw material, put it in a ball mill tank, and then add 1 / 2 part of additives , titanium phosphate and deionized water, mixed uniformly by ball milling to obtain a modified coating mixture;

[0037] Preparation of S3 corrosion-resistant NdFeB: Add the curing agent, the remaining 1 / 2 part of additives and fillers to the modified coating mixture obtained in step S2, stir and mix evenly, and then spin-coat the NdFeB pretreated in step S1 For the surface of boron material, it takes 1 hour to raise th...

Embodiment 2

[0048] The preparation method of low-cost and high-corrosion-resistant NdFeB in this embodiment comprises the following steps:

[0049] S1 NdFeB pretreatment: use an initial impulse current of 60A to treat the sintered NdFeB magnet for 5 minutes in the titanium salt solution, and then reduce the current to 30A for 30 minutes;

[0050]Preparation of S2 modified coating mixture: Stir and mix fluorine-containing methacrylate, epoxy resin, and vinyl epoxy resin evenly to prepare the main raw material, put it in a ball mill tank, and then add 1 / 2 part of additives , titanium phosphate and deionized water, mixed uniformly by ball milling to obtain a modified coating mixture;

[0051] Preparation of S3 corrosion-resistant NdFeB: Add the curing agent, the remaining 1 / 2 part of additives and fillers to the modified coating mixture obtained in step S2, stir and mix evenly, and then spin-coat the NdFeB pretreated in step S1 For the surface of boron material, after coating, it takes 0.5h...

Embodiment 3

[0062] The preparation method of low-cost and high-corrosion-resistant NdFeB in this embodiment comprises the following steps:

[0063] S1 NdFeB pretreatment: use an initial impulse current of 80A to treat the sintered NdFeB magnet for 1min in the titanium salt solution, and then reduce the current to 50A for 30min;

[0064] Preparation of S2 modified coating mixture: Stir and mix fluorine-containing methacrylate, epoxy resin, and vinyl epoxy resin evenly to prepare the main raw material, put it in a ball mill tank, and then add 1 / 2 part of additives , titanium phosphate and deionized water, mixed uniformly by ball milling to obtain a modified coating mixture;

[0065] Preparation of S3 corrosion-resistant NdFeB: Add the curing agent, the remaining 1 / 2 part of additives and fillers to the modified coating mixture obtained in step S2, stir and mix evenly, and then spin-coat the NdFeB pretreated in step S1 For the surface of boron material, it takes 1 hour to raise the temperat...

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Abstract

The invention discloses a preparation method of neodymium iron boron with low cost and high corrosion resistance. The preparation method comprises the following steps: S1, pretreating a sintered neodymium iron boron magnet by using an initial impact current in a titanium salt solution; S2, uniformly stirring and mixing fluorine-containing methacrylate, epoxy resin and vinyl epoxy resin to preparea main body raw material, putting the main body raw material into a ball-milling tank, adding 1 / 2 part of an additive and titanium phosphate, and performing ball-milling and uniform mixing to obtain amodified coating mixed solution; and S3, adding a curing agent, the remaining 1 / 2 part of additive and filler into the modified coating mixed solution obtained in the step S2, performing stirring andmixing uniformly, spin-coating the surface of the neodymium iron boron material pretreated in the step S1, and performing heating and drying after coating to obtain the corrosion-resistant neodymiumiron boron. According to the preparation method, after the neodymium iron boron is pretreated, the modified coating is subjected to spin coating and drying, the neodymium iron boron with high corrosion resistance is obtained, the preparation process is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of NdFeB, in particular to a preparation method of NdFeB with low cost and high corrosion resistance. Background technique [0002] Generally speaking, the basic ways to improve the corrosion resistance of materials can be considered from the two aspects of improving the corrosion resistance of the material itself and coating the material surface. For the protective treatment of NdFeB rare earth permanent magnet materials, the former can make the balance of the alloy The increased potential increases thermodynamic stability; the latter can be achieved by methods such as electroplating, electroless plating, organic coating, and physical vapor deposition. [0003] In the alloying method, the corrosion resistance of NdFeB rare earth permanent magnets can be improved to a certain extent by adding alloying elements, but this method has brought some adverse effects, such as increasing the production cost of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/10C09D163/00C09D7/61C09D7/63C09D5/08H01F1/057H01F41/02
CPCC08K2003/328C08L2201/08C08L2205/02C09D5/08C09D5/18C09D163/10C09D7/61C09D7/63H01F1/057H01F41/02C08L63/00C08K13/02C08K3/346C08K5/14C08K3/32C08K3/34
Inventor 徐嘉诚
Owner ZHEJIANG ZHONGHANG NEW MATERIAL
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