Method for improving performance of epoxy resin plating of neodymium iron boron permanent magnet

An epoxy resin, permanent magnet technology, applied in coating, electrophoretic plating, electrolytic coating, etc., can solve the problems of low efficiency, high cost, poor operability, etc., achieve low material and labor cost, low production cost, durable Corrosion performance and the effect of improving the bonding force

Active Publication Date: 2017-03-29
京磁材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, in order to meet the above requirements, the process of plating nickel on the magnet and then plating epoxy resin on the copper is used, which not only costs high, but also requires electrophoresis immediately after metal plating, and also has poor operability and low efficiency in process connection. shortcoming

Method used

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  • Method for improving performance of epoxy resin plating of neodymium iron boron permanent magnet
  • Method for improving performance of epoxy resin plating of neodymium iron boron permanent magnet
  • Method for improving performance of epoxy resin plating of neodymium iron boron permanent magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0043] S101. Pretreatment: the NdFeB permanent magnet is degreased, washed with water, pickled and ultrasonically washed in order to remove the oxide layer on the surface of the NdFeB permanent magnet;

[0044] S102, silane pretreatment: perform silane pretreatment on the pretreated NdFeB permanent magnet to form a silane conversion film on the surface, and the silane solution includes: YL-701 nanometer phosphorus-free coating agent and YL-702 accelerator; The concentration of the YL-701 nanometer phosphorus-free coating agent is 20ml / L; the concentration of the YL-702 accelerator is 10ml / L, and the silane pretreatment conditions: temperature: normal temperature, time: 100 seconds;

[0045] S103, cathodic epoxy resin electrophoretic coating: the NdFeB permanent magnet after silane pretreatment is subjected to cathodic epoxy electrophoretic coating to obtain a NdFeB permanent magnet coated with an epoxy resin film; the cathode epoxy The electrophoretic paint solution of the res...

Embodiment 2

[0048] S101. Pretreatment: the NdFeB permanent magnet is degreased, washed with water, pickled and ultrasonically washed in order to remove the oxide layer on the surface of the NdFeB permanent magnet;

[0049] S102, silane pretreatment: perform silane pretreatment on the pretreated NdFeB permanent magnet to form a silane conversion film on the surface, and the silane solution includes: YL-701 nanometer phosphorus-free coating agent and YL-702 accelerator; The concentration of the YL-701 nano-phosphorus-free film agent is 21ml / L; the concentration of the YL-702 accelerator is 11ml / L, silane pretreatment conditions: temperature: normal temperature, time: 60 seconds;

[0050] S103, cathodic epoxy resin electrophoretic coating: the NdFeB permanent magnet after silane pretreatment is subjected to cathodic epoxy electrophoretic coating to obtain a NdFeB permanent magnet coated with an epoxy resin film; the cathode epoxy The electrophoretic paint solution of the resin electrophoreti...

Embodiment 3

[0053] S101. Pretreatment: The NdFeB permanent magnets are sequentially degreased, washed, dry sandblasting and ultrasonic washing to remove the oxide layer on the surface of the NdFeB permanent magnets. The specific steps of the dry sandblasting are: Put the dried NdFeB permanent magnet into a fully enclosed dry sandblasting machine, add sand, and sandblast; ultrasonically wash the NdFeB permanent magnet after sandblasting;

[0054] S102, silane pretreatment: perform silane pretreatment on the pretreated NdFeB permanent magnet to form a silane conversion film on the surface, and the silane solution includes: YL-701 nanometer phosphorus-free coating agent and YL-702 accelerator; The concentration of the YL-701 nano-phosphorus-free film agent is 19ml / L; the concentration of the YL-702 accelerator is 9ml / L, silane pretreatment conditions: temperature: normal temperature, time: 180 seconds;

[0055] S103, cathodic epoxy resin electrophoretic coating: the NdFeB permanent magnet af...

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Abstract

The invention discloses a method for improving the performance of an epoxy resin plating of a neodymium iron boron permanent magnet. The method comprises the steps that firstly, the neodymium iron boron permanent magnet is coated with the epoxy resin plating in a cathodic electrophoresis mode, so that the neodymium iron boron permanent magnet coated with the epoxy resin plating is obtained; and secondly, the epoxy resin plating coated on the surface of the neodymium iron boron permanent magnet is solidified with the solidification temperature being 225-235 DEG C and the solidification time being 70-120 minutes. By adoption of the method for improving the performance of the epoxy resin plating of the neodymium iron boron permanent magnet, the high-temperature, high-humidity, high-pressure resistance and corrosion resistance of the epoxy resin plating of the neodymium iron boron permanent magnet can be improved, and the binding force of the epoxy resin plating of the neodymium iron boron permanent magnet can be increased; and a solidification process for the epoxy resin plating enables the product to reach the good level of longer than 264 hours in a pressure cooker test (PCT).

Description

technical field [0001] The invention belongs to the technical field of permanent magnet preparation, in particular to a method for improving the performance of an epoxy resin coating of an NdFeB permanent magnet. 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. Sintered neodymium iron boron (Nd-Fe-B) magnets are the permanent magnet materials with the best magnetic properties at present, and have been widely used in many fields such as motors, automobiles, and wind power generation. However, the corrosion resistance of magnets is poor. At present, there are two main methods of anti-corrosion treatment for NdFeB permanent magnets: 1. Metal plating protection, zinc Zn, nickel Ni, and copper Cu are plated on the surface of NdFeB permanent magnets. , Chromium Cr and other metal protective layers; 2. Organic coating protection (epoxy resin el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/06C25D13/20
CPCC25D13/04C25D13/20
Inventor 林萌微潘朝东
Owner 京磁材料科技股份有限公司
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