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Preparation method for anticorrosive and insulative plating layer of neodymium-iron-boron permanent magnet and neodymium-iron-boron permanent magnet with plating layer

An anti-corrosion insulation, NdFeB technology, applied in the manufacture of permanent magnets, inductors/transformers/magnets, coatings, etc. Magnetic flux reduction and other problems, to achieve good anti-corrosion performance and a wide range of applications

Active Publication Date: 2017-12-01
沈阳广泰真空科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still has some deficiencies: (1) Vacuum aluminum plating is completed at a high temperature of 250°C-300°C. Although the salt spray resistance of the coating is improved, the magnetic flux of the NdFeB permanent magnet will decrease after high temperature treatment (2) The existing methods usually only coat a single layer of aluminum film on the surface of the NdFeB permanent magnet, and the coating is directly combined with the NdFeB permanent magnet, the pinning effect is weak, and the firmness of the coating and corrosion resistance will be reduced

Method used

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  • Preparation method for anticorrosive and insulative plating layer of neodymium-iron-boron permanent magnet and neodymium-iron-boron permanent magnet with plating layer
  • Preparation method for anticorrosive and insulative plating layer of neodymium-iron-boron permanent magnet and neodymium-iron-boron permanent magnet with plating layer
  • Preparation method for anticorrosive and insulative plating layer of neodymium-iron-boron permanent magnet and neodymium-iron-boron permanent magnet with plating layer

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preparation example Construction

[0026] The embodiment of the present invention provides a method for preparing an NdFeB permanent magnet anti-corrosion insulating coating, comprising the following steps:

[0027] S1 surface pretreatment: Clean the surface of semi-finished NdFeB permanent magnets, remove pollutants and dry them.

[0028] In this step, the pollutants on the surface of the NdFeB permanent magnet, especially grease, etc. are removed by cleaning, which is beneficial to the subsequent coating. It should be noted that when cleaning, the standard is to remove the surface pollutants.

[0029] Further, drying is carried out after cleaning in this step, which can remove the moisture inside the NdFeB permanent magnet and avoid affecting the anti-corrosion effect. It should be noted that when drying, it is advisable to choose a drying temperature of 50°C-120°C, for example: the drying temperature can be 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C , 120°C, etc. This is because: the drying temperature is ...

Embodiment 1

[0052] S1 surface pretreatment: put the semi-finished NdFeB permanent magnet in the cleaning solution for 5 minutes, the composition of the cleaning solution is: sodium carbonate 10g / L, anhydrous calcium oxide 20g / L, sodium hydroxide 40g / L, the solvent is water Take it out after cleaning, rinse with 10us / cm deionized water for 1min; take it out after rinsing, place it in an ultrasonic cleaner for ultrasonic cleaning for 5min, the pH value of the ultrasonic water is 6.5; take it out after ultrasonic cleaning, use 10us / cm deionized water Ionized water is used for secondary rinsing, and the rinsing time is 1 min; take it out and put it in a drying oven at 80°C for 5 min.

[0053] S2 surface activation: place the dried NdFeB permanent magnet in the ion activation area of ​​the vacuum coating machine, the vacuum degree of the ion activation area is 1Pa, and use an ion source with a power of 3kW to activate the surface of the NdFeB permanent magnet , The activation time is 3min.

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Embodiment 2

[0056] The difference from Example 1 is that the cleaning solution used during surface pretreatment consists of: sodium carbonate 5g / L, anhydrous calcium oxide 15g / L, sodium hydroxide 10g / L, and the solvent is water. Except for the composition of the cleaning solution, other steps and operating conditions are the same as in Example 1.

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Abstract

The invention provides a preparation method for an anticorrosive and insulative plating layer of a neodymium-iron-boron permanent magnet and the neodymium-iron-boron permanent magnet with the plating layer. The anticorrosive and insulative plating layer, with the good fastness and anticorrosive effect, of the neodymium-iron-boron permanent magnet can be prepared on the premise that the magnetic flux of the neodymium-iron-boron permanent magnet is not influenced. The preparation method comprises the following steps that the surface of a semi-finished neodymium-iron-boron permanent magnet product is cleaned, and after contaminants are removed, drying is conducted; the dried neodymium-iron-boron permanent magnet is placed on an ion activation zone of a vacuum film plating machine, and activation treatment is conducted on the surface of the neodymium-iron-boron permanent magnet by adopting an ion source; the activated neodymium-iron-boron permanent magnet is transferred to a vacuum film plating zone of the vacuum film plating machine, and a bonding layer, an inner protecting layer, a transition layer and an outer protecting layer are sequentially deposited on the surface of the activated neodymium-iron-boron permanent magnet by adopting a vacuum magnetron sputtering mode at the temperature of lower than or equal to 100 DEG C.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of NdFeB permanent magnet materials, and in particular relates to a preparation method of an NdFeB permanent magnet anticorrosion insulation coating and an NdFeB permanent magnet with the coating. Background technique [0002] NdFeB permanent magnet material (chemical name NdFeB) belongs to the third generation of rare earth permanent magnets. Because of its high remanence, high coercive force and high magnetic energy product, it is widely used in new energy electric vehicles and permanent magnets for wind power generation. Motors, magnetic levitation, drones and many other sunrise industries. Although the NdFeB permanent magnet material has excellent magnetic properties, its corrosion resistance is poor. Therefore, in the prior art, a protective layer is usually plated on the surface of the NdFeB permanent magnet material to avoid its corrosion caused by magnet corrosion. The magnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/02C23C14/18C23C14/08C23C14/06H01F41/02
CPCC23C14/02C23C14/0641C23C14/08C23C14/18C23C14/352H01F41/026
Inventor 陈刚振东张浙军邓广林
Owner 沈阳广泰真空科技股份有限公司
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