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Neodymium-iron-boron permanent magnet surface protection method

A neodymium iron boron, surface treatment technology, applied in ion implantation plating, metal material coating process, coating and other directions, can solve the problem of target poisoning, affecting the effect of aluminum plating, etc.

Inactive Publication Date: 2016-07-27
TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In vacuum aluminum plating, the aluminum layer with good performance can be obtained by using direct current, but when oxygen is mixed in the target chamber, the target will be poisoned, which will affect the effect of aluminum plating

Method used

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  • Neodymium-iron-boron permanent magnet surface protection method
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  • Neodymium-iron-boron permanent magnet surface protection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First put the 2.5kg The sintered NdFeB permanent magnet material was mechanically vibrated in a vibration mill for 2 hours, then degreased and degreased with an alkaline solution (sodium phosphate 20g / L, sodium carbonate 10g / L and sodium hydroxide 10g / L), and then in Pickling and rust removal in 1% nitric acid solution. Then wet sandblasting to remove rust.

[0019] Hang the dried NdFeB workpiece in the vacuum chamber, vacuumize to 10Pa with a mechanical pump, and then vacuumize with a turbomolecular pump to make the vacuum of the vacuum chamber reach 1.0*10 -4 Pa. Using argon as the working gas, fill it with argon to 25 Pa, use a DC power supply with a negative bias of 400 volts, and a temperature of 250 degrees to magnetron sputter aluminum in a vacuum sintering furnace. The aluminum plating time is 160 minutes, and the thickness of the aluminum layer is 1.2 microns. Oxygen is introduced, the ratio of oxygen and argon is 1:5, the vacuum degree in the room is 5 Pa...

Embodiment 2

[0021] According to the method of embodiment 1 to 2.5kg NdFeB permanent magnet materials for surface pretreatment. Then wet sandblasting to remove rust. Hang the dried NdFeB workpiece in the vacuum chamber, vacuumize to 10Pa with a mechanical pump, and then vacuumize with a turbomolecular pump to make the vacuum of the vacuum chamber reach 1.0*10 -3 Pa. Using argon as the working gas, fill it with argon to 15 Pa, use a DC power supply with a negative bias of 450 volts, and a temperature of 250 degrees to magnetron sputter aluminum in a vacuum sintering furnace. The aluminum plating time is 200 minutes, and the thickness of the aluminum layer is 3 microns. Oxygen is introduced, the ratio of oxygen and argon is 1:4, the vacuum degree in the room is 5 Pa, the radio frequency power supply is 600 volts negative bias, the temperature is 230 degrees, and the aluminum oxide is plated by magnetron sputtering, and the thickness of the aluminum layer is 2 microns. See Table 1.

Embodiment 3

[0023] According to the method of embodiment 1 to 2.5kg NdFeB permanent magnet materials for surface pretreatment. Then wet sandblasting to remove rust. Hang the dried NdFeB workpiece in the vacuum chamber, vacuumize to 10Pa with a mechanical pump, and then vacuumize with a turbomolecular pump to make the vacuum of the vacuum chamber reach 1.0*10 -4 Pa. Using argon as the working gas, fill it with argon to 25 Pa, use a DC power supply with a negative bias of 400 volts, and a temperature of 250 degrees to magnetron sputter aluminum in a vacuum sintering furnace. The aluminum plating time is 300 minutes, and the thickness of the aluminum layer is 1.0 micron. Oxygen is introduced, the ratio of oxygen and argon is 1:4.5, the vacuum degree in the room is 5 Pa, the negative bias of 600 volts of radio frequency power is used, the temperature is 230 degrees, and the aluminum oxide is plated by magnetron sputtering, and the thickness of the aluminum layer is 3 microns. See Table 1...

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Abstract

The invention provides a neodymium-iron-boron permanent magnet surface protection method. The method comprises 1, material polishing: carrying out conventional polishing on a permanent magnetism material, 2, degreasing oil removal: adding an alkaline solution into the polished permanent magnetism material and carrying out conventional degreasing oil removal, 3, conventional rust removal utilizing wet method sandblasting, 4, vacuum magnetron sputtering aluminum deposition and 5, vacuum plating of an aluminum trioxide protection layer. Through vacuum magnetron sputtering aluminum and aluminum trioxide plating, a neodymium-iron-boron permanent magnet vacuum aluminum plating binding force is improved and corrosion resistance is improved.

Description

technical field [0001] The invention relates to an anticorrosion method for NdFeB permanent magnet materials, in particular to a surface protection method for NdFeB permanent magnets. 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 made of rare earth metals such as 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 of NdFeB permanent magnet materials. As...

Claims

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Application Information

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IPC IPC(8): C23C14/35C23C14/08C23C14/16
Inventor 白晓刚潘广麾李大军
Owner TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD
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