Neodymium iron boron magnet and neodymium iron boron magnet surface plating method

A NdFeB magnet technology is applied in the field of NdFeB magnets and NdFeB magnet surface coating, NdFeB magnets and NdFeB magnets surface coating anti-corrosion layer, which can solve the problem of poor bonding force between film and substrate, corrosion , high equipment structure requirements, to achieve the effect of improving anti-corrosion performance, ensuring compactness and improving corrosion resistance

Active Publication Date: 2018-04-20
金力永磁(宁波)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, R-Fe-B rare earth sintered magnets are very easy to rust, and the method of improving corrosion resistance mainly adopts various surface treatments, such as water electroplating, NiCuNi, Zn, epoxy, etc., but these electroplating methods have an impact on the environment. There is a lot of water treatment pressure, especially the existing electroplating process, which is a metal electrodeposition process including liquid phase mass transfer, electrochemical reaction and electrocrystallization. However, NdFeB is a very easy to corrode metal. During the process, it will be corroded by the acidity and alkalinity of the electrolyte, and there will also be electrochemical corrosion, so the surface of the magnet will become very loose due to corrosion, so the bonding force between the coating and the magnet is relatively poor.
[0003] In recent years, the method of vacuum plating has bee

Method used

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  • Neodymium iron boron magnet and neodymium iron boron magnet surface plating method
  • Neodymium iron boron magnet and neodymium iron boron magnet surface plating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Multi-arc ion plating aluminum base, then magnetron sputtering aluminum plating

[0073] 1. After the NdFeB magnet is soaked in the degreasing solution for 10 minutes, it is ultrasonically pickled for 20 seconds to clean the dust on the surface. After drying, it is placed in a vacuum magnetron sputtering furnace.

[0074] 2. Turn on the heating of the furnace body to keep the temperature in the furnace at 200°C, and turn on the vacuum pump to make the vacuum degree in the furnace reach 4.0*10 -3 .

[0075] 3. Turn on the multi-arc power supply to coat the surface of the magnet with the first layer of aluminum coating. The current is set to 45A, the coating time is 0.5h, and the coating thickness is 1μm.

[0076] 4. Turn off the multi-arc power supply, turn on the intermediate frequency power supply, and set the current to 13A, so that the second layer of aluminum coating is coated on the surface of the magnet. The coating time is 1.5h, and the coating thickness is 6μm....

Embodiment 2

[0084] Multi-arc ion galvanizing as primer, then magnetron sputtering aluminum plating

[0085] 1. After the NdFeB magnet is soaked in the degreasing solution for 10 minutes, it is ultrasonically pickled for 20 seconds to clean the dust on the surface. After drying, it is placed in a vacuum magnetron sputtering furnace.

[0086] 2. Turn on the heating of the furnace body to keep the temperature in the furnace at 200°C, and turn on the vacuum pump to make the vacuum degree in the furnace reach 4.0*10 -3 .

[0087] 3. Turn on the multi-arc power supply to coat the surface of the magnet with the first layer of zinc coating. The current is set to 45A, the coating time is 0.5h, and the coating thickness is 1μm.

[0088] 4. Turn off the multi-arc power supply, turn on the intermediate frequency power supply, and set the current to 13A, so that the second layer of aluminum coating is coated on the surface of the magnet. The coating time is 1.5h, and the coating thickness is 6μm.

...

Embodiment 3

[0093] Multi-arc ion plating aluminum base, then magnetron sputtering aluminum plating

[0094] 1. After the NdFeB magnet is soaked in the degreasing solution for 10 minutes, it is ultrasonically pickled for 20 seconds to clean the dust on the surface. After drying, it is placed in a vacuum magnetron sputtering furnace.

[0095] 2. Turn on the heating of the furnace body to keep the temperature in the furnace at 200°C, and turn on the vacuum pump to make the vacuum degree in the furnace reach 6.0*10 -3 .

[0096] 3. Turn on the multi-arc power supply to coat the surface of the magnet with the first layer of aluminum coating. The current is set to 45A, the coating time is 0.8h, and the coating thickness is 1.2μm.

[0097] 4. Turn off the multi-arc power supply, turn on the intermediate frequency power supply, and set the current to 13A, so that the surface of the magnet is coated with a second layer of aluminum coating, the coating time is 2h, and the coating thickness is 8μm....

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Abstract

The invention provides a neodymium iron boron magnet with the surface plated with an anti-corrosion layer. The neodymium iron boron magnet comprises a neodymium iron boron magnet body, a multi-arc ionclad layer compounded on the surface of the neodymium iron boron magnet body, and a magnetron sputtering clad layer compounded on the surface of the multi-arc ion clad layer. The invention further provides a method for neodymium iron boron magnet surface plating. Multi-arc ion plating is only adopted in the magnet surface firstly, bottoming flattening is conducted on the magnet surface, the manner of secondary plating through magnetron sputtering is adopted, the multi-arc plating efficiency is high, good film combining and magnetron sputtering film density are effectively combined, the density of the clad layer is improved, the anti-corrosion performance of the film is improved, and the neodymium iron boron magnet with the surface plated with the anti-corrosion layer is obtained. The provided method for neodymium iron boron magnet surface plating, the technology is simple, and the method is suitable for large-scale industry production.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and relates to an NdFeB magnet and a method for coating the surface of an NdFeB magnet, in particular to a NdFeB magnet coated with an anti-corrosion layer on the surface and a method for coating the surface of an Nd-Fe-B magnet with an anti-corrosion layer . Background technique [0002] Permanent magnets are hard magnets, magnets that can maintain their magnetism for a long time, and are not easy to lose their magnetization or be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. Hard magnets can be divided into natural magnets and artificial magnets. Artificial magnets mean that by synthesizing alloys of different materials, the same effect as natural magnets (magnets) can be achieved, and the magnetic force can also be improved. So far, it has developed to the third generation of NdFeB permane...

Claims

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Application Information

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IPC IPC(8): C23C14/35C23C14/32C23C14/16C23C14/08C22C38/12C22C38/32C22C38/06C22C38/16C22C38/10C22C38/14
CPCC22C38/002C22C38/005C22C38/06C22C38/10C22C38/12C22C38/14C22C38/16C22C38/32C23C14/081C23C14/083C23C14/086C23C14/16C23C14/325C23C14/35
Inventor 毛华云梁礼渭
Owner 金力永磁(宁波)科技有限公司
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