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

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

Example Embodiment

[0013] Example 1: Five pieces of neodymium-iron-boron permanent magnets with the grade of 35SH and the specifications of 45×45×8.7mm are used, and one piece is directly subjected to mechanical chamfering, degreasing, pickling, and activation pre-treatment processes, and then the neodymium iron The surface of boron permanent magnet is plated with nickel-copper-nickel coating. The remaining 4 blocks are operated according to the following process steps:

[0014] (1) Prepare four sealing agents with one or two of propyl oleate and butyl oleate in a ratio of 1:1 and 1:2;

[0015] (2) Put the neodymium iron boron permanent magnet into an oven to heat, the heating temperature is 200 ℃, and count for 2 hours after reaching the set temperature;

[0016] (3) Take out the neodymium iron boron permanent magnet from the oven, immerse the four permanent magnets in the four sealing agent solutions completely, and take it out after the permanent magnet surface temperature is lower than 40℃;

[0017...

Example Embodiment

[0021] Example 2:

[0022] Adopt 5 pieces of neodymium iron boron permanent magnets with the grade of 35SH and the specifications of 45×45×8.7mm, one of which is directly subjected to mechanical chamfering, degreasing, pickling, and activation pretreatment processes, and then on the surface of the neodymium iron boron permanent magnets Nickel-copper-nickel plating. The remaining 4 blocks are operated according to the following process steps:

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

[0024] (2) Put four pieces of neodymium iron boron permanent magnets into an oven for heating, the heating temperature is 120, 160, 200, 240 ℃ respectively, after reaching the set temperature, timing for 2 hours;

[0025] (3) Take out the neodymium iron boron permanent magnet from the oven, completely immerse the remaining four permanent magnets in the sealing solution, and take it out after the surface temperature of the magnet is lower than 40℃;

[00...

Example Embodiment

[0030] Example 3:

[0031] Adopt 5 pieces of neodymium iron boron permanent magnets with the grade of 35SH and the specifications of 45×45×8.7mm, one of which is directly subjected to mechanical chamfering, degreasing, pickling, and activation pretreatment processes, and then on the surface of the neodymium iron boron permanent magnet Nickel-copper-nickel plating. The remaining 4 blocks are operated according to the following process steps:

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

[0033] (2) Put the neodymium iron boron permanent magnet into an oven for heating, the heating temperature is 200 ℃, after reaching the set temperature, the heating time is 1h, 1.5h, 2h, 2.5h;

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

[0035] (4) Perfor...

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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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