Method of supersonic chemical plating nickel phosphorus of powder metallurgy material

A technology of ultrasonic chemistry and powder metallurgy, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problem of easy oxidation and rust of NdFeB permanent magnets, affecting the quality of the coating, the use of magnets, and the porosity of the electroless nickel coating. Large and other problems, to achieve the effect of shortening the degreasing time, increasing the service life and strengthening the degreasing effect

Inactive Publication Date: 2003-04-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

For example, neodymium-iron-boron (NdFeB) permanent magnet materials are prepared by powder metallurgy, and NdFeB permanent magnets are made after SmCo 5 and Sm 2 co 17 The third generation of rare earth permanent magnet materials after that has become an important functional material in the modern high-tech field due to its high saturation magnetization, coercive force and magnetic energy product, but because NdFeB permanent magnets are easy to oxidize and rust, corrosion resistance Poor performance limits its wide application
[0003] In the prior art, the methods of electroless plating and electroplating are mostly used for materials with similar surface treatment. Among the electroless plating technologies, neutral electroless plating, acidic electroless plating and alkaline electroless plating have been developed. These electroless plating methods have been developed several times. Ten years, according to incomplete statistics, there are at least two hundred kinds of mature electroless

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0059] Example 1

[0060] The method of the present invention is used for plating on the surface of powder metallurgy TiC tool materials, and the details are as follows:

[0061] (1) Degreasing

[0062] a. Vacuum degreasing

[0063] Vacuum heat treatment at 200°C for 1 hour is used to remove oil stains on the surface of TiC tool materials. Because TiC tool materials are powder metallurgy materials, the surface is rough, the surface is rough, and the pores are large, so it has a strong adsorption force for oil stains. Therefore, vacuum degreasing is used; It can prevent the oxidation of TiC tools in the air;

[0064] b. lye degreasing

[0065] After vacuum degreasing, lye degreasing is carried out. The pH value of the lye is 10, and the lye formula is as follows:

[0066] Na 2 CO 3 :15g / l; Na 3 PO 4 ·12H 2 O: 20g / l;

[0067] Na 2 SiO 3 : 5g / l; OP-10 emulsifier: 1g / l;

[0068] (OP-10 emulsifier, commercially available product, source: Shenyang Reagent Store)

[0069] The temperature...

Example Embodiment

[0088] Example 2

[0089] The difference from Example 1 lies in:

[0090] The surface of the neodymium iron boron permanent magnetic material is plated by the method of the present invention. The plating solution uses sodium hypophosphite as the reducing agent, nickel sulfate as the main salt, additional complexing agents, accelerators, and stabilizers. Ultrasonic electroless plating and two Sub-chemical plating method; firstly, the NdFeB material is chamfered, and the NdFeB material is chamfered by the mechanical barrel grinding method. The volume ratio of the NdFeB material sample to the brown corundum sand is 1.0:1.0 and placed in a sealed ceramic drum. The total volume is about 3 / 4 of the total volume of the drum, then add alcohol to immerse the sample, start the drum, the drum speed is 30r / min, and the time is 36 hours;

[0091] The formula of the ultrasonic chemical plating bath is as follows:

[0092] Main salt: NiSO 4 ·6H 2 O: 27g / l; reducing agent: NaH 2 PO 2 ·H 2 O: 33g / ...

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Abstract

In the invention, the sodium hypopphosphite 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. Theultrasonic chemical plating is adopted that utilizes the mechanical energy of the ultrasonic vibration, making the bath deposit nickel and phosphor under the catalysis of the metal surface and the chemical reduction method controlled. The plating procedure includes the steps of 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 a method for ultrasonically electroless nickel-phosphorous plating of powder metallurgy materials. Background technique [0002] In recent years, the application and development of powder metallurgy materials are very rapid, and most of the materials are synthesized from a variety of powders, and there are many micropores on the surface of the materials due to technological reasons. For example, neodymium-iron-boron (NdFeB) permanent magnet materials are prepared by powder metallurgy, and NdFeB permanent magnets are made after SmCo 5 and Sm 2 co 17 The third generation of rare earth permanent magnet materials after that has become an important functional material in the modern high-tech field due to its high saturation magnetization, coercive force and magnetic energy product, but because NdFeB permanent magnets are easy to oxidize and rust, corrosion resi...

Claims

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Application Information

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IPC IPC(8): B22F1/02C23C18/36
Inventor 吴杰金花子吴敏杰崔新宇熊天英
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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