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Surface coating process of neodymium-iron-boron magnet

A NdFeB magnet technology, applied in metal material coating process, superimposed layer plating, coating and other directions, can solve the problems of low thermal demagnetization rate, poor soft wear resistance, and great influence of magnet thermal demagnetization rate. , to achieve the effect of good binding force, not easy to fall off, and small environmental damage

Pending Publication Date: 2022-04-22
NINGBO ZHAOBAO MAGNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, double-nickel plating and nickel-plated copper-nickel have a great influence on the thermal demagnetization rate of magnets (especially for mobile phone parts, products with small sizes), and galvanized, aluminum-plated and epoxy-plated coatings are soft and wear-resistant. ; When the product needs to have good wear resistance and low thermal demagnetization rate at the same time, the existing coating is generally difficult to meet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In embodiment 1, a kind of surface coating process of neodymium iron boron magnet, comprises the following steps:

[0024] S1. Grinding: first use coarse sandpaper to remove the covering on the surface of the NdFeB magnet, and then use metallographic sandpaper to polish the surface of the NdFeB magnet until smooth;

[0025] S2. Degreasing and cleaning: put the polished NdFeB magnet into the degreasing liquid, and ultrasonically clean it for 10 minutes. After the ultrasonic cleaning is completed, rinse it with clean water;

[0026] S3. Pickling: put the NdFeB magnet after degreasing and cleaning into the acid solution, and ultrasonically clean it for 5 minutes. After the ultrasonic cleaning is completed, rinse it with clean water and dry it;

[0027] S4. Surface conditioning treatment: put the pickled and dried NdFeB magnets into the surface conditioning solution, soak for 30s, and then dry them;

[0028] S5. Activation treatment: Put the surface-adjusted NdFeB magnet i...

Embodiment 2

[0038] In embodiment 2, a kind of surface coating process of neodymium iron boron magnet, comprises the following steps:

[0039] S1. Grinding: first use coarse sandpaper to remove the covering on the surface of the NdFeB magnet, and then use metallographic sandpaper to polish the surface of the NdFeB magnet until smooth;

[0040] S2. Degreasing and cleaning: put the polished NdFeB magnet into the degreasing liquid, and ultrasonically clean it for 15 minutes. After the ultrasonic cleaning is completed, rinse it with clean water;

[0041] S3. Pickling: put the NdFeB magnet after degreasing and cleaning into the acid solution, and ultrasonically clean it for 10 minutes. After the ultrasonic cleaning is completed, rinse it with clean water and dry it;

[0042] S4, surface conditioning treatment: put the pickled and dried NdFeB magnets into the surface conditioning solution, soak for 60s, and then dry them;

[0043] S5. Activation treatment: Put the surface-adjusted NdFeB magnet ...

Embodiment 3

[0053] In embodiment 3, a kind of surface coating process of NdFeB magnet comprises the following steps:

[0054] S1. Grinding: first use coarse sandpaper to remove the covering on the surface of the NdFeB magnet, and then use metallographic sandpaper to polish the surface of the NdFeB magnet until smooth;

[0055] S2. Degreasing and cleaning: put the polished NdFeB magnet into the degreasing liquid, and ultrasonically clean it for 12 minutes. After the ultrasonic cleaning is completed, rinse it with clean water;

[0056] S3. Pickling: put the NdFeB magnet after degreasing and cleaning into the acid solution, and ultrasonically clean it for 8 minutes. After the ultrasonic cleaning is completed, rinse it with clean water and dry it;

[0057] S4, surface conditioning treatment: put the pickled and dried NdFeB magnets into the surface conditioning solution, soak for 40s, and then dry them;

[0058] S5. Activation treatment: put the surface-adjusted NdFeB magnet into the activati...

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Abstract

The invention relates to the technical field of neodymium-iron-boron magnets, in particular to a neodymium-iron-boron magnet surface coating process which comprises the following steps: S1, polishing; s2, removing oil and cleaning; s3, acid pickling; s4, performing surface conditioning processing; s5, activating treatment; s6, nickel electroplating treatment, wherein an electroplating solution comprises the following components: 100-110 g / L of nickel sulfate, 60-80 g / L of nickel chloride, 20-50 g / L of sodium sulfate, 40-60 g / L of boric acid and 0.05-0.1 g / L of lauryl sodium sulfate; the pH value of the electroplating solution is 4.0-5.0, the electroplating treatment time is 30-60 minutes, the temperature is 60-65 DEG C, the current density is 0.5-0.6 A / dm < 2 >, and the thickness of a plating layer is 2-6 microns; s7, chemical nickel-tungsten-phosphorus alloy plating treatment; according to the coating technology, operation is easy and convenient, in the coating process, used reagents have little harm to the environment, the composite coating almost has no influence on the thermal demagnetization rate of the magnet, the binding force between the composite coating and a base body is very good, the composite coating is not prone to falling off, and the corrosion resistance of the neodymium-iron-boron magnet is greatly improved.

Description

technical field [0001] The invention relates to the technical field of NdFeB magnets, in particular to a surface coating process of NdFeB magnets. Background technique [0002] New NdFeB magnets are the third generation of rare earth materials, usually made of Nd 2 Fe 14 Composed of B main phase and neodymium-rich phase at the grain boundary, it is a magnetic functional material with poor corrosion resistance and its magnetic structure is easily affected by temperature. The composite coating process can form a coating on the surface of the NdFeB magnet that has excellent corrosion resistance and has little effect on the thermal demagnetization of the magnet. [0003] At present, the types of coatings commonly used for NdFeB magnets are zinc plating, double nickel plating, nickel copper nickel plating, aluminum plating, and epoxy plating. Although each has its advantages, it also has its shortcomings. Among them, double-nickel plating and nickel-plated copper-nickel have ...

Claims

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Application Information

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IPC IPC(8): C25D5/36C25D7/00C25D3/12C23C18/48C23C28/02H01F41/02
CPCC25D5/36C25D7/001C25D3/12C23C18/1653C23C18/48C23C28/021H01F41/026
Inventor 林建强贺琦军
Owner NINGBO ZHAOBAO MAGNET
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