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Sintered NdFeB magnet surface temporary protection organic coating and preparation method thereof

An organic coating and neodymium-iron-boron technology, applied in the manufacture of permanent magnets, coatings, magnetic materials, etc., can solve the problems of increasing the cost of three wastes, environmental pollution of phosphorus-containing wastewater, etc., to reduce porosity, improve mechanical properties, Improve the uniform effect

Active Publication Date: 2016-11-16
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after phosphating treatment, the discharge of a large amount of phosphorus-containing wastewater is likely to cause serious environmental pollution, resulting in an increase in the cost of the three wastes in the later stage.

Method used

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  • Sintered NdFeB magnet surface temporary protection organic coating and preparation method thereof
  • Sintered NdFeB magnet surface temporary protection organic coating and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] In this embodiment, a temporary protective organic coating is prepared on the surface of the sintered NdFeB magnet according to the following steps:

[0036] (1) Pretreatment of sintered NdFeB magnets:

[0037] First, use HNO with a mass fraction of 25% 3 The solution pickled the sintered NdFeB magnets for 5 seconds, ultrasonically cleaned the pickled magnets, and cleaned the ultrasonically cleaned magnets with 3% HNO 3 Soak the sintered NdFeB magnet in the solution for 10s, perform the second ultrasonic cleaning on the soaked magnet, and immerse the magnet after the second ultrasonic cleaning in NaOH solution for 3 minutes; finally, take out the magnet from the NaOH solution Clean with alcohol, then dry with cold air for later use;

[0038] (2) Preparation of silyl organic alcohol solution:

[0039] Prepare γ-aminopropyltriethoxysilane, phenyltrimethoxysilane, deionized water, absolute ethanol, and ethylene glycol at a volume ratio of 1:1:0.8:3:3, using acetic acid ...

Embodiment 2

[0055] In this embodiment, a temporary protective organic coating is prepared on the surface of the sintered NdFeB magnet according to the following steps:

[0056] (1) Pretreatment of sintered NdFeB magnets:

[0057] With a mass fraction of 25% HNO 3 The solution pickled the sintered NdFeB magnets for 8s, ultrasonically cleaned the pickled magnets, and cleaned the ultrasonically cleaned magnets with 2% HNO 3 Soak the sintered NdFeB magnet in the solution for 15s, and then perform the second ultrasonic cleaning on the soaked magnet, and immerse the magnet after the second ultrasonic cleaning in NaOH solution for 4min; finally, take out the magnet from the NaOH solution Clean with alcohol, then dry with cold air for later use;

[0058] (2) Preparation of silyl organic alcohol solution:

[0059] Prepare γ-aminopropyltriethoxysilane, phenyltrimethoxysilane, deionized water, absolute ethanol, and ethylene glycol at a volume ratio of 2:1.5:1:4:4, using acetic acid Adjust the pH...

Embodiment 3

[0075] (1) Pretreatment of sintered NdFeB magnets:

[0076] First, use HNO with a mass fraction of 25% 3 The solution pickled the sintered NdFeB magnets for 10s, ultrasonically cleaned the pickled magnets, and cleaned the ultrasonically cleaned magnets with 1% HNO 3 Soak the sintered NdFeB magnet in the solution for 20s, perform the second ultrasonic cleaning on the soaked magnet, and immerse the magnet after the second ultrasonic cleaning in NaOH solution for 5 minutes; finally, take out the magnet from the NaOH solution Clean with alcohol, then dry with cold air for later use;

[0077] (2) Preparation of silyl organic alcohol solution:

[0078] Prepare γ-aminopropyltriethoxysilane, phenyltrimethoxysilane, deionized water, absolute ethanol, and ethylene glycol in a volume ratio of 3:2:1.2:5:6, using acetic acid Adjusting the pH value of the solution, stirring the silane-based organic alcohol solution for 20 hours, so that the components in the solution are evenly mixed;

...

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Abstract

The invention discloses a sintered NdFeB magnet surface temporary protection organic coating and a preparation method thereof. A prepared silicyl organic protection thin film is modified through a compounding mode of anode metal nanoparticles such as Al and Zn; by means of the compounding of the nanoparticles, the porosity of the thin film can be remarkably reduced, and the uniformity and consistency of the magnet surface silicyl organic protection thin film are improved; meanwhile, anode metal nanometer Al powder and nanometer Zn powder are compounded in the silicyl organic protection thin film, in the efficacy-loss early period of a protection layer, the electrochemical activity of nanometer Al and nanometer Zn is remarkably higher than the electrochemical potential of an NdFeB base body, and therefore sacrificial anode protection can be provided for the base body in the electrochemical corrosion environment, corrosion protection can continue to be provided for the magnet, the anticorrosion performance and the mechanical performance of the magnet surface silicyl film are further improved, and finally the surface temporary anticorrosion organic coating with excellent comprehensive performance is obtained.

Description

technical field [0001] The invention relates to the field of magnetic material surface protection, in particular to the preparation of an organic coating for temporary surface protection of sintered NdFeB magnets. Background technique [0002] Sintered neodymium-iron-boron (NdFeB) magnets have been widely used in many fields such as electronics, motors, automobiles, electric power, medical equipment, instrumentation, aerospace and other fields since their appearance in 1983. However, the sintered NdFeB magnet prepared by powder metallurgy has a multiphase structure, and the electrochemical activity of the intergranular Nd-rich phase is extremely high, resulting in a large potential difference between the phases inside the magnet. In an electrochemical environment, it is easy to Galvanic corrosion occurs, resulting in extremely poor corrosion resistance of sintered NdFeB magnets, which seriously limits the further expansion of magnet application fields. At present, there are...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057C09D183/08C09D5/10
CPCC09D4/00C09D5/103C09D5/106H01F1/057H01F41/026
Inventor 张鹏杰曹玉杰张浩衣晓飞吴玉程刘家琴陈静武黄秀莲
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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