Nickel phosphorus chemical plating method of neodymium iron boron permanent magnet material

A technology of electroless nickel-phosphorus and permanent magnet materials, applied in liquid electroless plating, metal material coating process, coating, etc. Stability and other issues, to shorten the degreasing time, improve the service life, and strengthen the degreasing effect.

Inactive Publication Date: 2003-04-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NdFeB permanent magnet is following SmCo 5 and Sm 2 co 17 The third generation of rare-earth permanent magnet materials has become an important functional material in the modern high-tech field due to its high saturation magnetization, coercive force and magnetic energy product. However, due to technological reasons, there are many micropores on the surface of the material. The surface of NdFeB permanent magnet is porous and the existence of Nd-rich phase makes it easy to oxidize and rust, and its poor corrosion resistance limits its wide application
[0003] In the existing technology, Al-Cr acid passivation method, organic coating method, vacuum coating method, electroplating and chemical plating are often used for surface treatment of NdFeB materials, and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Adopt the method of the present invention to carry out plating on the surface of NdFeB permanent magnet material, operate successively according to the following steps:

[0064] (1) Chamfer

[0065] Using mechanical rolling and chamfering method, according to the volume ratio of NdFeB material sample and brown corundum sand 1.0:1.0, put it into the closed ceramic drum, the total amount accounts for about 3 / 4 of the total volume of the drum, and then add alcohol to immerse For the sample, start the drum, the drum speed is 30r / min, and the time is 36 hours;

[0066] (2) Degreasing

[0067] a. Vacuum degreasing:

[0068] Use vacuum heat treatment at 200°C for 1 hour to remove the oil on the surface of the NdFeB material. Since the NdFeB permanent magnet is a powder metallurgy material with a rough surface and many pores, it has a strong adsorption force for oil, so vacuum degreasing is used; in addition, it can also Prevent oxidation of NdFeB permanent magnets in air; ...

Embodiment 2

[0104] The difference from Example 1 is:

[0105] The ultrasonic electroless plating formula is as follows:

[0106] Main salt: nickel sulfate: 30g / l;

[0107] Reducing agent: sodium hypophosphite: 40g / l;

[0108] Complexing agent: sodium acetate: 24g / l; propionic acid: 20g / l; DL-malic acid: 20g / l;

[0109] Glycine: 6g / l; EDTA: 5g / l; Sodium citrate: 20g / l;

[0110] Accelerator: succinic acid: 20g / l;

[0111] Stabilizer: lead acetate (Pb 2+ ): 2ppm; Thiourea H 2 NCSNH 2 : 3ppm;

[0112] Ultrasonic electroless plating process parameters are as follows:

[0113] Frequency: 80kHz, power: 500W, pH: 7.0, temperature: 85°C, time: 2 minutes, plating speed 30μm / hour;

[0114] The formula of electroless plating solution is as follows:

[0115] Main salt: nickel sulfate: 30g / l;

[0116] Reducing agent: sodium hypophosphite: 40g / l;

[0117] Complexing agent: sodium acetate: 24g / l; DL-malic acid: 20g / l; glycine: 5g / l;

[0118] Sodium citrate: 6g / l; Lactic acid:...

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Abstract

In the invention, the sodium hypophosphite is as the reducing agent of the bath, nickel sulfate as the main salt, with the complexing agent, accelerating agent and stabilizing agent being added. The ultrasonic chemical plating and second chemical plating method are adopted that utilizes the mechanical energy of the ultrasonic vibration, making the bath deposit nickel and phosphor under the catalysis of the metal surafce and the chemical reduction method controlled. The plating procedure includes the steps of edge rounding, oil removal, rust removal, activation, chemical plating and post treatment. The multiple complexing, accelerating and stabilizing agents raises the stability of the bath. The plating speed is adjustable. The even, compact nickel and phosphor plating layer covers the surface of the base body of powder metallurgical material so as to increase the service life of the material and provide wide application area.

Description

technical field [0001] The invention relates to the field of surface chemical treatment of materials, in particular to an electroless nickel-phosphorus plating method for NdFeB permanent magnet materials. Background technique [0002] In recent years, the application and development of NdFeB permanent magnet materials is very rapid, and the success of the protection of NdFeB permanent magnet materials is the key to whether the material can be popularized and applied. NdFeB permanent magnet is following SmCo 5 and Sm 2 co 17 The third generation of rare earth permanent magnet materials has become an important functional material in the modern high-tech field due to its high saturation magnetization, coercive force and magnetic energy product. However, due to technological reasons, there are many micropores on the surface of the material. The surface of NdFeB permanent magnet is porous and the existence of Nd-rich phase makes it easy to oxidize and rust, and its poor corros...

Claims

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Application Information

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IPC IPC(8): C23C18/18C23C18/36
Inventor 熊天英金花子吴杰吴敏杰崔新宇李铁藩
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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