Preparation method of high-corrosion-resistance protective coating on surface of neodymium-iron-boron magnet

A protective coating, NdFeB technology, applied in coating, metal material coating process, ion implantation plating, etc., can solve the problems of difficult control of reactive sputtering process, reduction of film-forming particle energy, brittle breakage and falling off, etc. , to achieve the effects of eliminating target poisoning, improving corrosion resistance, and low friction coefficient

Active Publication Date: 2020-06-19
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is mainly because Al 2 o 3 The following problems and deficiencies still exist in the preparation of thin films, specifically: 1. Reactive sputtering of Al 2 o 3 The thin film has a typical target poisoning phenomenon. With the prolongation of the deposition time, the gradually deepened target poisoning state will significantly reduce the energy of the film-forming particles, resulting in a loose and porous film structure, which will adversely affect the corrosion resistance.
2. The reactive sputtering process is difficult to control. In order to ensure the stoichiometric ratio of alumina, the deposition process is mostly in the target poisoning mode of reactive sputtering, and the deposition rate is very low, which cannot meet the needs of industrialization
3. Al 2 o 3 Thin films are inherently brittle materials. The growth difference of thermal expansion coefficient and structure leads to the continuous increase of stress of the film, which is prone to brittle damage or shedding, and it is impossible to realize the preparation of thick films (>5μm) that are conducive to improving corrosion resistance.

Method used

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  • Preparation method of high-corrosion-resistance protective coating on surface of neodymium-iron-boron magnet
  • Preparation method of high-corrosion-resistance protective coating on surface of neodymium-iron-boron magnet
  • Preparation method of high-corrosion-resistance protective coating on surface of neodymium-iron-boron magnet

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preparation example Construction

[0036] figure 1 A flow chart of a method for preparing a high corrosion-resistant protective coating on the surface of an NdFeB magnet provided in an embodiment of the present application, as shown in figure 1 As shown, the embodiment of the present application provides a method for preparing a high corrosion-resistant protective coating on the surface of an NdFeB magnet, including:

[0037] Step 100, pretreatment: cleaning the NdFeB magnet and the vacuum chamber of the coating equipment, this step specifically includes:

[0038] Step 101. Magnet pretreatment: Chamfering the NdFeB magnet and putting it into a vibratory grinder to obtain an NdFeB magnet with a corner arc not less than 0.5mm, followed by sandblasting and ultrasonication of an acid-base solution Cleaning, use the air pump to dry the surface of the magnet and put it into the vacuum chamber of the coating equipment;

[0039] Step 102, air path cleaning: pump the air pressure of the vacuum chamber to 1.0×10 -3 Be...

Embodiment 2

[0071] This embodiment is a method for preparing a high corrosion-resistant protective coating on the surface of an NdFeB magnet. In this embodiment, the spectral line intensity at Al-396nm is 60% to prepare a high corrosion-resistant protective coating on the surface of an NdFeB magnet. The method includes the following steps:

[0072] (1) Pretreatment:

[0073] (1) Magnet pretreatment: chamfering will be carried out, and put into a vibrating grinder to obtain NdFeB magnets with corner arcs not less than 0.5mm, followed by sandblasting and ultrasonic cleaning of acid-base solutions, using air The pump dries the surface of the magnet and puts it into the vacuum chamber of the coating equipment;

[0074] Wherein, the size of the NdFeB magnet in this embodiment is 60*60*10 mm.

[0075] (2) Gas path cleaning: pump the air pressure of the vacuum chamber to 1.0×10 -3 Below Pa, pass argon and oxygen into the vacuum chamber to clean the gas path.

[0076] (3) Ion source bombardme...

Embodiment 3

[0103] This example is a method for preparing a high corrosion-resistant protective coating on the surface of an NdFeB magnet. In this example, the spectral line intensity at Al-396nm is 65% to prepare a high corrosion-resistant protective coating on the surface of an NdFeB magnet. The method includes the following steps:

[0104] (1) Pretreatment

[0105] (1) Magnet pretreatment: chamfer the NdFeB magnet (size 30*10*5mm), put it into a vibratory grinder, obtain NdFeB magnets with corner arcs not less than 0.5mm, and then carry out For sandblasting and ultrasonic cleaning of acid and alkaline solutions, the air pump is used to dry the surface of the magnet and put it in the vacuum chamber of the coating equipment.

[0106] (2) Gas path cleaning: pump the air pressure of the vacuum chamber to 1.0×10 -3 Below Pa, pass argon and oxygen into the vacuum chamber to clean the gas path.

[0107] (3) Ion source bombardment cleaning: close the front baffle of the cathode target and ope...

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Abstract

The embodiment of the invention relates to a preparation method of a high-corrosion-resistance protective coating on the surface of a neodymium-iron-boron magnet. According to the preparation method,an Al / Al2O3 multi-layer film structure is formed in an alternative deposition mode through detection and feedback control of plasma characteristic parameter, so that microdefects of the coating are effectively reduced, the uniform and compact Al2O3 layer blocks a crystal boundary penetrating through the coating, and the corrosion resistance of the surface of the neodymium-iron-boron magnet is obviously improved; meanwhile, the surface hardness of the Al coating is improved, and coating failure caused by surface scratches can be effectively prevented; in addition, the method also solves the problems of low deposition rate, difficult structure control, limited coating thickness and the like in an existing preparation technology, and ensures the process stability and repeatability in the industrial production process; and meanwhile, long-term use in the high-salinity climate can be achieved based on the super-strong corrosion resistance, the coating is particularly suitable for a neodymium iron boron permanent magnet material in an offshore wind energy motor, and huge economic and social benefits can be brought.

Description

technical field [0001] The invention relates to the technical field of coating preparation, in particular to a method for preparing a high corrosion-resistant protective coating on the surface of an NdFeB magnet. Background technique [0002] NdFeB (NdFeB), as the third-generation rare earth permanent magnet material, is widely used in sunrise industries such as wind power generation, new energy vehicles and energy-saving home appliances because of its excellent magnetic properties and high cost performance. However, since the sintered NdFeB permanent magnet material is a powder metallurgy material with strong chemical activity, its magnet surface is easily corroded and oxidized, which seriously hinders its large-scale application in the industrial field. At present, in order to improve the corrosion resistance of NdFeB magnets, the most commonly used methods are alloying method and surface coating protective layer method. However, the former usually sacrifices the magnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/02C23C14/16C23C14/08C23C14/58
CPCC23C14/021C23C14/081C23C14/165C23C14/35C23C14/58C23C14/5826
Inventor 夏原高方圆
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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