A vapor deposition method for permanent magnet anti-corrosion pretreatment

A vapor deposition and permanent magnet technology, which is applied in the surface treatment of NdFeB permanent magnet materials and the pretreatment field of permanent magnet materials before coating, can solve the problems of lack of protective effect of NdFeB rare earth permanent magnets, local corrosion, Al plating layer damage and other problems, to overcome the shortcomings of magnetic damage, improve corrosion resistance, the effect of dense coating

Inactive Publication Date: 2018-02-02
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After PVD Al plating on the surface of NdFeB rare earth permanent magnets, although the Al plating protective layer has excellent anti-corrosion performance and can withstand long-term salt spray test and accelerated corrosion (PCT) test, but because Al is a kind of low hardness The soft surface layer is easy to be scratched, resulting in local corrosion, and then the entire NdFeB magnet is corroded
During the handling and use of NdFeB magnets, due to the mutual collision and friction of the magnets, the surface layer is often scratched and deformed, so that the Al plating layer is damaged, and the protection of NdFeB rare earth permanent magnets cannot be achieved. effect

Method used

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  • A vapor deposition method for permanent magnet anti-corrosion pretreatment
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  • A vapor deposition method for permanent magnet anti-corrosion pretreatment

Examples

Experimental program
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Effect test

Embodiment 1

[0048]In this embodiment, the magnetron sputtering technology is used to sputter-deposit a nano-multilayer film of zirconium (Zr) and zirconium nitride (ZrN) with a NdFeB magnet as a substrate. Concrete preparation process is as follows:

[0049] (1) Pretreatment: Grinding the NdFeB permanent magnets; placing the polished NdFeB permanent magnets in an ultrasonic cleaner filled with degreasing liquid for ultrasonic-assisted degreasing treatment; The NdFeB permanent magnet after oil treatment is placed in an ultrasonic cleaner filled with derusting liquid for ultrasonic assisted derusting treatment; the NdFeB permanent magnet after ultrasonic assisted derusting treatment is placed in boiling deionized water for sealing Pore ​​treatment; the time for the sealing treatment is 10 minutes.

[0050] (2) Put it into the vacuum chamber of the magnetron sputtering equipment after drying. Vacuum the membrane to a vacuum of 7×10 -3 Pa. Introduce argon (Ar) to a vacuum of 3Pa. Turn on...

Embodiment 2

[0065] In this embodiment, arc ion plating technology is used to deposit titanium (Ti) and titanium nitride (TiN) nanometer multilayer film with NdFeB magnet as the substrate. Concrete preparation process is as follows:

[0066] (1) Pretreatment: Grinding the NdFeB permanent magnets; placing the polished NdFeB permanent magnets in an ultrasonic cleaner filled with degreasing liquid for ultrasonic-assisted degreasing treatment; The NdFeB permanent magnet after oil treatment is placed in an ultrasonic cleaner filled with derusting liquid for ultrasonic assisted derusting treatment; the NdFeB permanent magnet after ultrasonic assisted derusting treatment is placed in boiling deionized water for sealing Pore ​​treatment; the time for the sealing treatment is 20 minutes.

[0067] (2) After drying, put it into the vacuum chamber of the arc ion plating equipment. Vacuum the membrane to a vacuum of 7×10 -3 Pa. Argon (Ar) was introduced to a vacuum of 4Pa. Turn on the negative bia...

Embodiment 3

[0081] In this embodiment, magnetron sputtering technology is used to sputter-deposit a thin film of nanometer multilayer structure of chromium (Cr) and chromium nitride (CrN) with NdFeB magnet as the substrate. Concrete preparation process is as follows:

[0082] (1) Pretreatment: Grinding the NdFeB permanent magnets; placing the polished NdFeB permanent magnets in an ultrasonic cleaner filled with degreasing liquid for ultrasonic-assisted degreasing treatment; The NdFeB permanent magnet after oil treatment is placed in an ultrasonic cleaner filled with derusting liquid for ultrasonic assisted derusting treatment; the NdFeB permanent magnet after ultrasonic assisted derusting treatment is placed in boiling deionized water for sealing Pore ​​treatment; the time for the sealing treatment is 20 minutes.

[0083] (2) Put it into the vacuum chamber of the magnetron sputtering equipment after drying. Vacuum the membrane to a vacuum of 7×10 -3 Pa. Argon (Ar) was introduced to a ...

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Abstract

A vapor deposition method used for pre-treatment of permanent magnet anticorrosion relates to the field of surface treatment of materials. The invention adopts physical vapor deposition technology to deposit a nanometer multi-layer structure film on the surface of NdFeB. Before this step, the NdFeB surface can be passivated, and after this step, an electrophoretic method can be used to deposit a coating. The invention discloses a method for pre-treating magnetic material NdFeB by adopting gas phase deposition technology to replace phosphating. This technology can overcome the NdFeB magnetic performance damage caused by the phosphating process. The method is green and pollution-free, the process parameters are easy to control, and has broad application prospects. The transition group metal / nitride composite coating prepared by the method has excellent bonding performance with the NdFeB permanent magnet, and can significantly improve the corrosion resistance of the NdFeB permanent magnet when matched with an electrophoresis or electroplating process.

Description

technical field [0001] The invention relates to the field of surface treatment of materials, in particular to the surface treatment technology of neodymium-iron-boron (NdFeB) permanent magnet materials. Specifically, the invention relates to a pretreatment technology of permanent magnet materials before coating. Background technique [0002] As the strongest magnetic material at present, neodymium iron boron (NdFeB) has been widely used in machinery, medical treatment, automobile and other fields, and its application prospect is very broad. However, the chemical properties of NdFeB are active, and it is extremely prone to rust under natural environmental conditions, which seriously hinders its large-scale application. How to obtain magnet materials with high corrosion resistance has become the focus of research in recent years. NdFeB is composed of thin-layer Nd-rich and B-rich phases and base phase Nd 2 Fe 14 B composition. Different phases are in contact with each othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/02C23C14/16C23C14/06C23C14/35C23C14/28C25D13/00
Inventor 杜军朱胜朱晓莹王尧王红美周新远
Owner ACADEMY OF ARMORED FORCES ENG PLA
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