Surface treatment method for neodymium iron boron permanent magnetic material by organic aluminum plating

A permanent magnet material, neodymium iron boron technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of poor maintenance, high cost of electroplating aluminum, etc., and achieve the effect of improving anti-corrosion performance, low porosity, and reducing costs

Inactive Publication Date: 2012-04-04
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

However, electroplating aluminum with this organic solution has the problems of high cost and difficult maintenance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Will 2.3 kilograms of 18mm sintered NdFeB permanent magnet materials are polished in a vibration mill for 2 hours. After sodium phosphate 20g / liter, sodium carbonate 10g / liter, sodium hydroxide 10g / liter degreasing and oil removal, pickling in 1% nitric acid to remove surface oxides, washing with water, adding absolute ethanol with anhydrous sodium sulfate, , into tetrahydrofuran, under argon protection, aluminum plating, current density 0.5A / square decimeter. The composition of the aluminum liquid is 0.7mol / L, AlCl 3 : LiAlH 4 The molar ratio is 1:1, 0.7mol AlCl 3 and 950 ml LiAlH 4 Make up to 1 liter with tetrahydrofuran as solvent. The thickness of the aluminum layer is 5 microns, and the aluminum grain size in the aluminum layer is 20 nanometers. Aluminum anodize the product after electroplating in 15% sulfuric acid successively for 60 minutes, the electric current is 2 amps / dm2, after washing with water, seal it with 10% potassium dichromate at 92° C., and d...

Embodiment 2

[0024] Will 2.3 kilograms of 18mm sintered NdFeB permanent magnet materials are polished in a vibration mill for 2 hours. After sodium phosphate 20g / liter, sodium carbonate 10g / liter, sodium hydroxide 10g / liter degreasing and oil removal, pickling in 1% nitric acid to remove surface oxides, washing with water, adding absolute ethanol with anhydrous sodium sulfate, After cleaning with absolute ethanol three times, under the protection of nitrogen, electroplate aluminum with a current density of 2A / square decimeter. The composition of the aluminum liquid is 1.3mol / L, AlCl 3 : LiAlH 4 The molar ratio is 3:1, and the rest is 850 ml / liter of tetrahydrofuran. The thickness of the aluminum layer is 30 microns, and the aluminum grain size of the aluminum layer is 200 nanometers. Aluminum anodize the electroplated product in 15% sulfuric acid successively for 60 minutes, the electric current is 2A / square decimeter, after washing with water, seal it with 10% potassium dichromate at...

Embodiment 3

[0026] Will 2.3 kilograms of 18mm sintered NdFeB permanent magnet materials are polished in a vibration mill for 2 hours. After sodium phosphate 20g / liter, sodium carbonate 10g / liter, sodium hydroxide 10g / liter degreasing and oil removal, pickling in 1% nitric acid to remove surface oxides, washing with water, adding absolute ethanol with anhydrous sodium sulfate, After cleaning with absolute ethanol three times, put it in tetrahydrofuran, and then, under the protection of argon, electroplate aluminum with a current density of 1.5A / square decimeter. The composition of the aluminum liquid is 1.2 mol / L, the molar ratio of AlCl3 to LiAlH4 is 2, and the rest is 900 ml / L of tetrahydrofuran. The thickness of the aluminum layer is 10 micrometers, and the aluminum grain size is 120 nanometers. Aluminum anodizes the product after electroplating in 15% sulfuric acid successively, and then seals it with 10% potassium dichromate at 92°C and blows it dry. Aluminum anodize the electropl...

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Abstract

The present invention provides an organic aluminum plating method for a neodymium iron boron permanent magnetic material. The method comprises the following steps: (1) carrying out chamfering and polishing; (2) carrying out degreasing and deoiling; (3) carrying out pickling and derusting; (4) carrying out organic aluminum plating: adopting an aluminum plating solution to carry out aluminum layer plating on the surface of the neodymium iron boron permanent magnetic material under the protection of inert gas, wherein the aluminum plating solution comprises AlCl3, LiAlH4 and tetrahydrofuran; (5) passivating the aluminum plating layer. With the organic aluminum plating method of the present invention, the neodymium iron boron permanent magnetic material can have the excellent corrosion resistance.

Description

technical field [0001] The invention relates to a surface treatment method for NdFeB permanent magnet materials, in particular to a surface treatment method for organic aluminum plating of NdFeB permanent magnet materials Background technique [0002] In recent years, the application and development of NdFeB permanent magnet materials is very rapid, and the protection of NdFeB permanent magnet materials is one of the key technologies related to the promotion and application of NdFeB permanent magnet materials. NdFeB permanent magnet materials are mainly prepared from rare earth metals such as neodymium (Nd), iron and boron through powder metallurgy process. As the strongest magnetic material at present, NdFeB permanent magnet materials have been widely used in electroplating devices, machinery, medical treatment, automobiles and other fields, and their application prospects are very broad. [0003] The premise of the application of NdFeB permanent magnet materials is to fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/44H01F1/057
Inventor 白晓刚潘广麾
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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