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Surface pretreating method of dry method spray sand type neodymium iron boron permanent magnetic material

A processing method and technology of permanent magnetic materials, applied in the direction of magnetic materials, abrasives, magnetic objects, etc., can solve the problems of reduced magnetic properties, corrosion, and easy peeling off of the coating, so as to improve the bonding force, improve the cohesive force, and change the roughness of the coating degree of effect

Active Publication Date: 2011-11-09
BEIJING ZHONG KE SAN HUAN HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pickling is used to remove the scale, because the NdFeB permanent magnet material is a porous material pressed by powder metallurgy process, which will cause hydrogen embrittlement due to pickling, and the pickling liquid will enter the pores of NdFeB to cause further corrosion of the material. , resulting in the powdering of the surface of the NdFeB permanent magnet, the coating is easy to fall off, and the magnetic performance is reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 2.3 kg of NdFeB permanent magnet material of ￠24*99*7mm in the vibration mill for 2 hours, and then dry it. Use 10-mesh sand powder, adjust the pressure of the sandblasting machine to 6MP, the partial pressure of the spray gun to 0.1MP, adjust the sandblasting angle to 10 degrees, and the sandblasting time is 5 minutes. After sand blasting, ultrasonic water washing is carried out, and electroless copper plating is carried out. The proportion of electroless copper plating solution is as follows: copper sulfate 0.03 mol / L, sodium sulfite 0.10 mol / L, EDTA 0.05 mol / L, sodium citrate 0.25 mol / L, potassium sodium tartrate 0.15 mol / L, ethylenediamine 0.10 mol / L And sodium fluoride 0.10 mol / L, pH 7.2. React at a temperature of 55°C for 15 minutes in a drum to form a copper layer on the surface of the NdFeB permanent magnet material. The thickness of the copper layer is 3.5 microns, and the cross file test shows that the copper plating layer does not peel off, does not pee...

Embodiment 2

[0024] Polish 2.5 kg of NdFeB permanent magnet material of ￠24*9*7mm according to the method in Example 1, and blow dry. Use 10-mesh aluminum powder, adjust the pressure of the sandblasting machine to 6MP, the partial pressure of the spray gun to 0.2MP, adjust the sandblasting angle to 20 degrees, and the sandblasting time is 5 minutes. After sand blasting, ultrasonic water washing is carried out, and electroless copper plating is carried out. The proportion of the electroless copper plating solution is as follows: copper sulfate 0.03 mol / liter, potassium sulfite 0.10 mol / liter, EDTA 0.15 mol / liter, sodium fluoride 0.05 mol / liter, pH 6.5. React in a drum for 15 minutes at a temperature of 45°C to form a copper layer on the surface of the NdFeB permanent magnet material. The thickness of the copper layer is 3.5 microns, and the cross file test shows that the copper plating layer does not peel off, does not peel off, and has a good bonding force, see Table 1.

Embodiment 3

[0026] Polish 2.5 kg of NdFeB permanent magnet material of ￠24*9*7mm according to the method in Example 1, and blow dry. Use 10-mesh sand powder, adjust the pressure of the sandblasting machine to 6MP, the partial pressure of the spray gun to 0.1MP, adjust the sandblasting angle to 30 degrees, and the sandblasting time is 5 minutes. After sand blasting, ultrasonic water washing is carried out, and electroless copper plating is carried out. The proportion of electroless copper plating solution is as follows: copper sulfate 0.03 mol / L, sodium sulfite 0.10 mol / L, EDTA 0.05 mol / L, sodium citrate 0.25 mol / L, potassium sodium tartrate 0.15 mol / L, ethylenediamine 0.10 mol / L , Sodium Fluoride 0.10 mol / L, pH 7.2. React at a temperature of 55°C for 15 minutes in a drum to form a copper layer on the surface of the NdFeB permanent magnet material. The thickness of the copper layer is 3.5 microns, and the cross file test shows that the copper plating layer does not peel off, does not pee...

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PUM

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Abstract

The invention provides a surface preprocessing method of a dry-process sand-spraying type NbFeB permanent magnet material. The method comprises the following steps: chamfering, polishing, spraying sand, and chemical plating. Under the condition of room temperature, a natural sand blasting material is adopted to apply sand blasting on the surface of the NbFeB permanent magnet material; the pressure of a sand blasting machine is 0.16 to 8MP; the partial pressure of a spray gun is 0.16 to 6MP; and the sand blasting angle is 10 degree to 60 degree. A copper plating bath comprises copper sulfate of 0.03-0.5m / L, sulfite of 0.10-0.3m / L, fluoride of 0.05-0.7m / L and one or more components selected from EDTA, sodium citrate, potassium sodium tartrate and quadrol. The pH of 6.5-8.0 is achieved through adjustment, and the copper plating temperature is 10-65DEG C. The invention improves the binding force of a plating layer and a substrate, changes the roughness of the plating layer and improves the cohesive force of the plating layer.

Description

technical field [0001] The invention relates to the field of surface chemical treatment of materials, in particular to the surface pretreatment technology of dry sandblasting NdFeB permanent magnet materials. Background technique [0002] In recent years, the application and development of neodymium iron boron (NdFeB) permanent magnet materials is very rapid, and the success of the protection of NdFeB permanent magnet materials is related to one of the key technologies whether the material can be popularized and applied. The material is mainly prepared from elements such as rare earth metal neodymium (Nd), iron and boron through powder metallurgy process. As the strongest magnetic material at present, it has been widely used in electroplating devices, machinery, medical treatment, automobiles and other fields, and its application prospects are very broad. [0003] The premise of the application of NdFeB permanent magnet materials is to first solve the anti-corrosion problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057C25D3/38B24C3/00H01F41/00
Inventor 白晓刚潘广麾
Owner BEIJING ZHONG KE SAN HUAN HI TECH