Anticorrosion coating for neodymium-iron-boron rare earth permanent magnet and manufacturing method thereof

A manufacturing method, NdFeB technology, applied in the direction of coating, sputtering plating, ion implantation plating, etc., can solve the problem that the surface layer is scratched, deformed, localized corrosion, and can not be protected by NdFeB rare earth permanent magnets function and other issues, to achieve the effect of reducing the percentage of scratches

Active Publication Date: 2011-09-21
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After PVD Al plating on the surface of NdFeB rare earth permanent magnets, although the Al plating protective layer has excellent anti-corrosion properties, it can withstand long-term salt spray tests and accelerated corrosion (PCT) tests, but because Al is a very low hardness The soft surface layer of the metal is easily scratched, res...

Method used

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  • Anticorrosion coating for neodymium-iron-boron rare earth permanent magnet and manufacturing method thereof
  • Anticorrosion coating for neodymium-iron-boron rare earth permanent magnet and manufacturing method thereof
  • Anticorrosion coating for neodymium-iron-boron rare earth permanent magnet and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1～9

[0027] Vacuum Melting Atomic Percent Al 99.95 m 0.05 Al-based alloys, where M is one of Cr, Co, Mo, W, Zr, Ti, Nb, Mn, Ni elements. The alloy is made to size and shape to match the equipment. Cut the Nd-Fe-B sintered magnet into the required size and shape, put it into the vacuum furnace after washing and rinsing, and evacuate to 10 -3 After Pa, turn off the vacuum unit, heat the electrodes to evaporate the Al-based alloy, and after 1 hour, coat a layer of Al-based alloy coating of about 5 μm on the surface of the Nd-Fe-B magnets. Take out the evaporated magnet and put it into the prepared passivation solution for passivation for 5 minutes. After passivation, the outermost layer of the coating forms a thin layer of (Al100-xMx)2O3 with a thickness of about 0.02 μm. Please refer to Table 1 for the corrosion resistance properties and surface scratches of Al-based alloy coatings.

Embodiment 19～26

[0029] Vacuum Melting Atomic Percent Al 99.95 m 0.05 Al-based alloys, where M is one of Cr, Co, Mo, W, Zr, Ti, Nb, Mn, Ni elements. The alloy is made to size and shape to match the equipment. Cut the Nd-Fe-B sintered magnet into the required size and shape, put it into the vacuum furnace after washing and rinsing, and evacuate to 10 -3 After Pa, turn off the vacuum unit, heat the electrodes to evaporate the Al-based alloy, and after 3 hours, coat a layer of Al-based alloy coating of about 30 μm on the surface of the Nd-Fe-B magnets. Take out the evaporated magnet and put it into the prepared passivation solution for passivation for 30 minutes. After passivation, the outermost layer of the coating forms a layer (Al 100-x m x ) 2 o 3 Thin layer with a thickness of about 0.2 μm. Please refer to Table 1 for the corrosion resistance properties and surface scratches of Al-based alloy coatings.

Embodiment 27～33

[0031] Vacuum Melting Atomic Percent Al 99.95 m 0.05 Al-based alloys, where M is one of Cr, Co, Mo, W, Zr, Ti, Nb, Mn, Ni elements. The alloy is made to size and shape to match the equipment. Cut the Nd-Fe-B sintered magnet into the required size and shape, put it into the vacuum furnace after washing and rinsing, and evacuate to 10 -3 After Pa, turn off the vacuum unit, heat the electrode to evaporate the Al-based alloy, and after 2 hours, coat a layer of Al-based alloy coating of about 20 μm on the surface of the Nd-Fe-B magnets. Take out the evaporated magnet and put it into the prepared passivation solution for passivation for 20 minutes. After passivation, the outermost layer of the coating forms a layer (Al 100-x m x ) 2 o 3 Thin layer, about 0.1 μm in thickness. Please refer to Table 1 for the corresponding corrosion resistance properties and surface scratches of the coating.

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Abstract

The invention relates to a coating for a neodymium-iron-boron aluminum-based alloy and a manufacturing method thereof, wherein the coating has excellent anticorrosion properties and higher hardness. The coating for the aluminum-based alloy comprises an inner layer and an outermost layer, wherein the inner layer consists of an aluminum-based alloy coating A or B which comprises the component of Al100-x-Mx; and the outermost layer consists of an oxide layer alloy which comprises the component of (Al100-x-Mx)2O3, wherein M is one or more of Cr, Co, Mo, W, Zr, Ti, Nb and Mn elements, and x is more than or equal to 0.05 and is less than or equal to 10, and is average atomic percent. The coating is obtained through treatment by a vapor deposition process or a sputtering process, has the characteristics of higher hardness, strong bonding force, high compactness and the like, and can better protect neodymium-iron-boron magnets from being corroded to the maximum extent.

Description

technical field [0001] The invention relates to the anticorrosion coating on the surface of NdFeB rare earth permanent magnet alloy, and provides a method for manufacturing the anticorrosion coating. Background technique [0002] NdFeB rare earth permanent magnets have excellent magnetic properties and are widely used in electronics, motors, communications and other fields! However, its poor corrosion resistance makes it easy to rust, pulverize, and thus fail. In general, it is necessary to cover a layer of anti-corrosion coating on the surface of NdFeB rare earth magnets before they can be used. At present, common coatings include phosphating layer, electro-galvanized layer, electro-plated Ni layer and physical vapor deposition (PVD) Al-coated layer, etc.! Among them, PVD Al plating has been paid attention to due to its excellent anti-corrosion performance, small magnetic flux loss and environmental protection. Corrosion research development". [0003] After PVD Al plat...

Claims

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Application Information

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IPC IPC(8): C23C14/16C23C14/02C23C14/58
Inventor 李正饶晓雷胡伯平王震西
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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