Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A preparation method of electroplating coating on the surface of NdFeB rare earth permanent magnet

A rare-earth permanent magnet and electroplating coating technology, which is applied in the manufacture of permanent magnets, inductors/transformers/magnets, circuits, etc., can solve the problems of coating failure, swelling, foaming, and restricting applications, so as to increase the bonding area, Uniform current density and improved binding force

Active Publication Date: 2019-03-05
凉山稀土产业技术研究院
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There will be hydrogen evolution effect during the pretreatment and electroplating process, and the generated hydrogen will infiltrate and adsorb in the micropores on the surface of the substrate. When the concentration is high, the adsorbed hydrogen will overflow due to expansion, which will generate a pressure on the coating, causing the coating to protrude from the substrate, forming bulging and foaming, resulting in failure of the coating and seriously affecting the anti-corrosion ability of the coating.
Since the surface of the NdFeB substrate contains a large number of micropores, the porosity is determined by the preparation process, and the hydrogen evolution effect is inevitable in the electroplating process, so the electroplating quality of rare earth permanent magnets can not be compared with the electroplating quality of ordinary metal substrates. This shortcoming It also severely restricts its further application in the fields of electrical machinery, electronics, aerospace, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A preparation method of electroplating coating on the surface of NdFeB rare earth permanent magnet
  • A preparation method of electroplating coating on the surface of NdFeB rare earth permanent magnet
  • A preparation method of electroplating coating on the surface of NdFeB rare earth permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The preparation method of the electroplated coating on the surface of the neodymium iron boron rare earth permanent magnet of this embodiment is carried out according to the following steps:

[0052] (1) Surface pretreatment of NdFeB rare earth permanent magnets:

[0053] Sandblast the surface of the neodymium iron boron rare earth permanent magnet with a size of 30mm×30mm×3mm, and use a spray gun to spray the fine sand with a particle size of 400-1000 mesh on the surface of the neodymium iron boron rare earth permanent magnet to remove the oxide layer on the surface of the magnet. Until the fresh white surface is exposed;

[0054] (2) Vacuum treatment of neodymium iron boron rare earth permanent magnets:

[0055] Put the neodymium iron boron rare earth permanent magnet with the surface pretreatment into a sealed tank, the inside of the sealed tank is covered with PTFE coating, the top of the sealed tank is a sealed tank cover, and the vacuum tube and the electroplating solutio...

Embodiment 2

[0059] The preparation method of the electroplated coating on the surface of the neodymium iron boron rare earth permanent magnet of this embodiment is carried out according to the following steps:

[0060] (1) Surface pretreatment of NdFeB rare earth permanent magnets:

[0061] Sandblast the surface of the NdFeB rare earth permanent magnet with a size of 40mm×20mm×3mm, and use a spray gun to spray fine sand with a particle size of 400~1000 onto the surface of the NdFeB rare earth permanent magnet to remove the oxide layer on the surface of the magnet. Until the fresh white surface is exposed;

[0062] (2) Vacuum treatment of neodymium iron boron rare earth permanent magnets:

[0063] Put the neodymium iron boron rare earth permanent magnet with the surface pretreatment into a sealed tank, the inside of the sealed tank is covered with PTFE coating, the top of the sealed tank is a sealed tank cover, and the vacuum tube and the electroplating solution inlet pipe are connected to the sea...

Embodiment 3

[0067] The preparation method of the electroplated coating on the surface of the neodymium iron boron rare earth permanent magnet of this embodiment is carried out according to the following steps:

[0068] (1) Surface pretreatment of NdFeB rare earth permanent magnets:

[0069] Sandblast the surface of the NdFeB rare earth permanent magnet with a size of 20mm×20mm×10mm, and use a spray gun to spray fine sand with a particle size of 400~1000 onto the surface of the NdFeB rare earth permanent magnet to remove the oxide layer on the surface of the magnet. Until the fresh gray surface is exposed;

[0070] (2) Vacuum treatment of neodymium iron boron rare earth permanent magnets:

[0071] Put the neodymium iron boron rare earth permanent magnet with the surface pretreatment into a sealed tank, the inside of the sealed tank is covered with PTFE coating, the top of the sealed tank is a sealed tank lid, and the vacuum tube and electroplating solution inlet pipe are connected to the sealed ta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of corrosion-prevention surface processing, and particularly relates to a fabrication method for a surface electroplating coating layer of an NdFeB rare-earth permanent magnet. The fabrication method comprises the steps of firstly, pre-processing a surface of the NdFeB rare-earth permanent magnet; secondly, performing vacuum pumping on the NdFeB rare-earth permanent magnet; and finally, electroplating by employing an ultrasonic wave electroplating groove. By the fabrication method, expansion and bubbles of a plating layer caused by a hydrogen evolution effect are prevented, the corrosion prevention performance of the surface coating layer of the NdFeB rare-earth permanent magnet is improved, an existing NdFeB electroplating corrosion-prevention technology is expected to be substituted, and thus, the fabrication method has a very wide application prospect.

Description

Technical field [0001] The invention belongs to the technical field of anti-corrosion surface treatment, and particularly relates to a method for preparing an electroplated coating on the surface of a neodymium iron boron rare earth permanent magnet. Background technique [0002] NdFeB rare earth permanent magnets have been used more and more with their excellent magnetic properties. They are widely used in automobile motors, elevator motors, energy-saving motors, medical nuclear magnetic resonance imaging, computer hard disk drives, mobile phone vibration motors, audio, Motors of hybrid vehicles, wind generators, etc. [0003] Since the neodymium iron boron rare earth permanent magnet is easy to oxidize, the surface coating treatment is generally required in the use of the aforementioned neodymium iron boron rare earth permanent magnet. At present, the widely used coating method is mainly electroplating, electroplating zinc, electroplating nickel, electroplating nickel, copper an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02C25D7/00C25D5/20C25D5/36
CPCC25D5/20C25D5/36C25D7/001H01F41/026
Inventor 裴文利田昂吴文远温权
Owner 凉山稀土产业技术研究院
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com