Preparation method of ultrathin neodymium-iron-boron permanent magnet surface protective coating

A technology of protective coating and permanent magnet, applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve the problem of magnetic performance decline, etc., to eliminate the reduction of the size of the magnet and the elimination of the neodymium-rich phase. loss, the copper layer is uniform and dense, and the deposition is firm

Active Publication Date: 2021-04-30
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects existing in the prior art, to provide a combination of the magnetron sputtering process does not require pickling pre-treatment, the advantages of making the prepared film deposition firm and compact corrosion resistance, to solve the existing problems There is a problem that the pickling solution and electroplating solution erode the matrix structure during the surface treatment of ultra-thin NdFeB permanent magnets used in the electronics industry, resulting in a decrease in magnetic properties, and does not affect the magnetic properties of the material, and can protect the Cu-Ni combination of ultra-thin NdFeB permanent magnets Coating, a method for preparing a protective coating on the surface of an ultra-thin NdFeB permanent magnet that can provide protection for the safe operation of electronic products

Method used

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  • Preparation method of ultrathin neodymium-iron-boron permanent magnet surface protective coating

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preparation example Construction

[0036] Such as figure 1Said, the present invention is a preparation method of ultra-thin NdFeB permanent magnet surface protective coating, the permanent magnet is a sheet with a thickness of ≤1mm, the NdFeB permanent magnet is a sintered NdFeB magnet, and the preparation The method comprises the following process steps:

[0037] S1. Clean the surface of the NdFeB permanent magnet, and dry it for use after treatment;

[0038] S2. Place the NdFeB permanent magnet on the workpiece bracket, heat up and preheat the NdFeB permanent magnet, and simultaneously evacuate the sealed cavity;

[0039] S3. Use argon as the cleaning gas to sputter the surface of the NdFeB permanent magnet to remove surface oxides, etc.;

[0040] S4. Use argon as the cleaning gas to sputter the surface of the target and remove surface oxides, etc.;

[0041] S5, magnetron sputtering is carried out to NdFeB permanent magnet, obtains the magnet of surface deposition Cu-Sn / Cu gradient coating;

[0042] S6, p...

Embodiment 1

[0078] 1) Soak the NdFeB magnet in a degreasing agent solution for 15 minutes, ultrasonically clean it for 1 minute, rinse it twice with clean water without removing the surface dirt, and place it on the workpiece bracket after drying;

[0079] 2) Turn on the heating device to keep the chamber temperature at 150°C, and at the same time turn on the vacuum pump to stabilize the vacuum degree of the chamber at 1.0×10-3Pa;

[0080] 3) Argon is used as the cleaning gas to remove oxides on the surface of the magnet and the surface of the target by sputtering;

[0081] 4) Turn on the power supply of the ion source, magnetron sputtering copper-tin coating on the surface of the magnet, the sputtering time is 1.5h, and the thickness of the coating is 5 μm;

[0082] 5) activating the permanent magnet on which the copper layer was deposited using a dilute sulfuric acid solution with a concentration of 0.5 wt%, for 5 s;

[0083] 6) Plating bright nickel on the surface of the above-mention...

Embodiment 2

[0086] 1) Soak the NdFeB magnet in a degreasing agent solution for 15 minutes, ultrasonically clean it for 1 minute, rinse it twice with clean water without removing the surface dirt, and place it on the workpiece bracket after drying;

[0087] 2) Turn on the heating device to keep the chamber temperature at 150°C, and at the same time turn on the vacuum pump to stabilize the vacuum degree of the chamber at 1.0×10-3Pa;

[0088] 3) Argon is used as the cleaning gas to remove oxides on the surface of the magnet and the surface of the target by sputtering;

[0089] 4) Turn on the power supply of the ion source, magnetron sputtering copper-tin coating on the surface of the magnet, the sputtering time is 2.0h, and the thickness of the coating is 6.5 μm;

[0090] 5) activating the permanent magnet on which the copper layer was deposited using a dilute sulfuric acid solution with a concentration of 0.5 wt%, for 5 s;

[0091] 6) Plating bright nickel on the surface of the above-menti...

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Abstract

The invention discloses a preparation method of an ultrathin neodymium-iron-boron permanent magnet surface protective coating. The method comprises the steps that direct current magnetron sputtering coating is performed on a neodymium-iron-boron magnet subjected to surface cleaning treatment to obtain a neodymium-iron-boron magnet with a copper gradient coating deposited on the surface; surface pretreatment is performed on the obtained neodymium-iron-boron magnet with the copper layer deposited on the surface, and then a nickel-based coating is applied to obtain the neodymium-iron-boron magnet with the Cu-Ni combined coating deposited on the surface; in the sputtering process, power supplies of a Cu-Sn target and a Cu target are turned on, and the Cu-Sn target and the Cu target are sputtered at the same time; the initial power of the Cu-Sn target is 120 W and is gradually reduced according to the speed of 3-5 W/min in the sputtering process until the Cu-Sn target is turned off; and the power of the Cu target is 150 W and is always kept unchanged, and the time is 1.5-3.0 hours. The ultrathin permanent magnet combines the advantages that a prepared film layer is deposited firmly and is compact and resistant to corrosion due to the fact that acid pickling pretreatment is not required in a magnetron sputtering technology, and the problem that the magnetic performance is reduced due to the fact that an acid pickling solution and an electroplating solution erode a matrix structure in the surface treatment process of the permanent magnet is solved.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion coatings on the surface of permanent magnet materials, in particular to a method for preparing an ultra-thin NdFeB permanent magnet surface protective coating. Background technique [0002] Rare-earth neodymium-iron-boron (NdFeB) permanent magnets with nickel plating have been widely accepted in the electronics industry. The nickel plating layer on the surface of the magnet generally adopts the Ni-Cu-Ni combination system, that is, the pre-plating nickel layer is used as the bottom layer to increase the bonding force of the plating layer, and then the copper plating layer and the bright nickel layer are applied to enhance its protective ability and achieve decorative properties. Require. The traditional electroplating nickel / copper / nickel surface treatment process is very mature for steel materials. However, due to the multi-phase structure and corrosion sensitivity of sintered NdFeB perma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/16C23C14/02C23C14/58C23C28/02
CPCC23C14/35C23C14/165C23C14/022C23C14/58C23C28/021C22C38/005C22C38/002C22C38/06C22C38/16
Inventor 高志强任鸿儒侯利锋卫英慧侯德琦
Owner TAIYUAN UNIV OF TECH
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