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Surface hot dipping and pore sealing method of neodymium-iron-boron permanent magnet material

A permanent magnet material, NdFeB technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of poor corrosion resistance of NdFeB permanent magnets

Inactive Publication Date: 2012-07-18
SHENYANG GENERAL MAGNETIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem of poor corrosion resistance of the above-mentioned NdFeB permanent magnets, the purpose of the present invention is to provide a surface hot-dip sealing method of NdFeB permanent magnets, which can make the NdFeB surface obtain good corrosion resistance. performance

Method used

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  • Surface hot dipping and pore sealing method of neodymium-iron-boron permanent magnet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: 5 pieces of NdFeB permanent magnets with a brand name of 35SH and a specification of 45×45×8.7mm are used, one of which is directly subjected to mechanical chamfering, degreasing, pickling, and activation pretreatment processes, and then the NdFeB permanent magnet The surface of the boron permanent magnet is plated with nickel-copper-nickel coating. The remaining 4 blocks are operated according to the following process steps:

[0014] (1) One or both of propyl oleate and butyl oleate are prepared into four sealing agents according to the ratio of 1:1 and 1:2;

[0015] (2) Put the NdFeB permanent magnet into the oven to heat, the heating temperature is 200°C, and count for 2 hours after reaching the set temperature;

[0016] (3) Take out the NdFeB permanent magnets from the oven, completely immerse the four permanent magnets in the four sealing agent solutions, and take them out after the surface temperature of the permanent magnets is lower than 40°C;

[00...

Embodiment 2

[0022] Five pieces of NdFeB permanent magnets with the brand name of 35SH and a specification of 45×45×8.7mm are used, one of which is directly subjected to mechanical chamfering, degreasing, pickling, and pre-activation pretreatment processes, and then on the surface of the NdFeB permanent magnet. Nickel-copper-nickel plating. The remaining 4 blocks are operated according to the following process steps:

[0023] (1) Prepare a sealing agent with propyl oleate and butyl oleate in a ratio of 1:1;

[0024] (2) Put four NdFeB permanent magnets into the oven to heat, the heating temperature is 120, 160, 200, 240 ℃ respectively, and count for 2 hours after reaching the set temperature;

[0025] (3) Take out the NdFeB permanent magnets from the oven, completely immerse the remaining four permanent magnets in the sealing solution, and take them out after the surface temperature of the magnets is lower than 40°C;

[0026] (4) Carry out mechanical chamfering, degreasing, pickling, act...

Embodiment 3

[0031] Five pieces of NdFeB permanent magnets with the brand name of 35SH and a specification of 45×45×8.7mm are used, one of which is directly subjected to mechanical chamfering, degreasing, pickling, and pre-activation pretreatment processes, and then on the surface of the NdFeB permanent magnet. Nickel-copper-nickel plating. The remaining 4 blocks are operated according to the following process steps:

[0032] (1) Prepare a sealing agent with propyl oleate and butyl oleate in a ratio of 1:1;

[0033] (2) Put the NdFeB permanent magnet into the oven to heat, the heating temperature is 200 ℃, and after reaching the set temperature, time the heating for 1h, 1.5h, 2h, 2.5h respectively;

[0034] (3) Take out the NdFeB permanent magnets from the oven, completely immerse the remaining four permanent magnets in the sealing agent solution, and take them out after the surface temperature of the magnets is lower than 40°C;

[0035] (4) Perform mechanical chamfering, degreasing, pic...

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Abstract

A surface hot dipping and pore sealing method of a neodymium-iron-boron permanent magnet material belongs to the technical field of surface corrosion protection of neodymium-iron-boron permanent magnet materials. The method comprises the steps of heating a neodymium-iron-boron permanent magnet at 120-240 DEG C for 1-2.5h; and impregnating the heated neodymium-iron-boron permanent magnet in a pore sealing agent and sealing micropores on the surface of the neodymium-iron-boron permanent magnet, and taking out untill the surface temperature of the neodymium-iron-boron permanent magnet is lower than 40 DEG C. The pore sealing agent is methyl oleate and / or ethyl oleate, and the ratio of methyl oleate to ethyl oleate is 1:1 or 1:2 when the pore sealing agent employs a mixture of methyl oleate and ethyl oleate. By adoption of the pore sealing method, after the heated neodymium-iron-boron permanent magnet contacts the low-temperature pore sealing agent, the volume of the surface micropores is reduced and the pressure inside the micropore is reduced, so that the pore sealing agent is sucked into the micropores and plays a role in sealing pores of the neodymium-iron-boron permanent magnet, and the corrosion reduction of acidic and basic solutions to the magnet surface is facilitated in an electroplating process. The neodymium-iron-boron permanent magnet subjected to sealing pore is uniform in surface structure, and ensures the bonding force and the corrosion resistant performance of an electroplating layer in the subsequent electroplating process.

Description

technical field [0001] The invention belongs to the technical field of surface anticorrosion of NdFeB permanent magnet materials, and in particular relates to a surface heat-dip sealing hole treatment method of NdFeB permanent magnet materials. technical background [0002] Since 1983, Japan's Sumitomo Special Metals Sagawa and others first produced Nd 2 Fe 14 Since the sintered NdFeB permanent magnet materials based on B compound, the development of NdFeB permanent magnet materials has been very rapid. It effectively promotes the development of modern science and technology and information industry, and provides a material guarantee for the emergence of new industries. At present, the application fields of sintered NdFeB permanent magnet materials mainly include new fields such as electronic information, automobile industry, medical equipment, energy transportation, industrial power-saving energy motors, energy-saving and environmental protection home appliances, and gree...

Claims

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Application Information

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IPC IPC(8): B22F3/26H01F1/057H01F1/08H01F41/02
Inventor 孙宝玉刘振刚裴文利惠鑫崔振华
Owner SHENYANG GENERAL MAGNETIC
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