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A kind of NdFeB magnet composite coating and preparation method thereof

A composite coating and NdFeB technology, which is applied in the manufacture of permanent magnets, inductors/transformers/magnets, electrical components, etc., can solve problems affecting the corrosion resistance of magnets, affecting the service life of magnets, and destroying the integrity of coatings, etc., to achieve Excellent binding force, high production efficiency, and strong environmental protection

Active Publication Date: 2022-06-21
NANTONG ZHENGHAI MAGNET CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot be directly applied to magnetic materials such as NdFeB magnets. The process of selectively corroding active metals will corrode iron and even neodymium in NdFeB magnets, destroying the magnet structure and affecting the corrosion resistance of the magnets.
And the porous structure obtained by corrosion of the coating is extremely beneficial to the storage capacity and life of lithium-ion batteries, but for NdFeB magnets, it will not only affect the corrosion resistance of the magnet but also destroy the integrity of the coating and affect the service life of the magnet

Method used

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  • A kind of NdFeB magnet composite coating and preparation method thereof
  • A kind of NdFeB magnet composite coating and preparation method thereof
  • A kind of NdFeB magnet composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] A composite coating is prepared on the surface of the pretreated NdFeB product, and the preparation process is as follows:

[0080] The first step is to electrodeposit nickel on the surface of the pretreated NdFeB product: the composition of the nickel plating solution is NiSO 4 ·6H 2 O350g / L, NiCl 2·6H 2 O 50g / L, H 3 BO 3 45g / L, sulfonamide 5ml / L, 1,4-butynediol 1ml / L, sodium lauryl sulfate 2ml / L;

[0081] Dk (cathode current density) range is 1.0-1.2A / dm 2 ;

[0082] In the second step, after the nickel plating is completed, the NdFeB product with the nickel layer on the surface is washed twice with water;

[0083] The third step, interlayer activation: after the second step of water washing is completed, the nickel-plated NdFeB product is subjected to interlayer activation, and the interlayer activation is the same as the activation process in the above-mentioned pretreatment;

[0084] The fourth step, after the third step is completed, wash the product twic...

Embodiment 1-1

[0091] After the preparation process in Example 1, the total thickness of the nickel-tin-nickel-zinc composite coating obtained was 20 μm, wherein the thickness of the nickel layer was 10 μm, and the thickness of the tin-nickel-zinc ternary alloy layer was 10 μm. Among them, the current densities for preparing the nickel layer and the tin-nickel-zinc layer are both 1.0-1.2A / dm 2 , the nickel layer electrodeposition time is 60min, and the tin-nickel-zinc layer electrodeposition time is 55min.

[0092] like figure 1 As shown, the surface of the nickel-tin-nickel-zinc composite coating is flat and dense.

[0093] like figure 2 As shown, in the tin-nickel-zinc ternary alloy layer, the content of Ni element is 16.38 wt %, the content of Zn element is 55.97 wt %, and the content of Sn element is 27.65 wt %.

Embodiment 1-2

[0095] After the preparation process in Example 1, the total thickness of the nickel-tin-nickel-zinc composite coating obtained is 8 μm, wherein the thickness of the nickel layer is 4 μm, and the thickness of the tin-nickel-zinc ternary alloy layer is 4 μm. Among them, the current densities for preparing the nickel layer and the tin-nickel-zinc layer are both 1.0-1.2A / dm 2 , the nickel layer electrodeposition time is 25min, and the tin-nickel-zinc layer electrodeposition time is 20min.

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Abstract

The invention discloses a composite coating of an NdFeB magnet and a preparation method thereof. The composite coating includes at least two coatings: a first coating and a second coating, wherein the first coating is a coating containing at least one metal in nickel, copper and zinc, and the second coating is a tin-nickel-zinc ternary alloy coating . The composite coating for NdFeB magnets provided by the present invention can further improve the corrosion resistance and heat and humidity resistance of NdFeB magnet products, the coating and the surface of the magnet, and the bonding force between the coating and the coating are excellent, and the coating is almost Will not affect the magnetic properties of the magnet. The overall preparation process has the advantages of simple operation, convenient maintenance, strong environmental protection, and high production efficiency. The corrosion resistance of the composite coating is good (SST can reach more than 300h), and the heat and humidity resistance can reach more than 3000h.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion of neodymium-iron-boron magnets, and particularly relates to a neodymium-iron-boron magnet composite coating and a preparation method thereof. Background technique [0002] Based on its own advantages, NdFeB is widely used in information technology, automobiles, motors, wind power, hybrid vehicles and other industries. NdFeB magnets are products of powder metallurgy. Due to the different electrode potentials of each Nd-rich phase, boron-rich phase and Nd-Fe-B main phase, it is easy to cause electrochemical corrosion, and Nd is one of the elements with high chemical activity. It is prone to corrosion, and the poor corrosion resistance of the surface is one of its key defects. Therefore, NdFeB magnets must be surface treated to prevent corrosion before application. [0003] Usually the surface treatment methods of NdFeB magnets include phosphating, electrodeposition, electrophoresis, sprayi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/10C25D5/12C25D3/56C25D3/60H01F41/02
CPCC25D5/10C25D5/12C25D3/56C25D3/565C25D3/60H01F41/026
Inventor 李志强刘艳魏蕊
Owner NANTONG ZHENGHAI MAGNET CO LTD
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