Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for plating double-layer zinc on surface of NdFeB permanent magnet material

A permanent magnet material, NdFeB technology, applied in metal material coating process, permanent magnet manufacturing, inductor/transformer/magnet manufacturing, etc. Poor corrosion resistance and other problems, to achieve the effects of good moisture and heat resistance, high corrosion resistance, and easy disposal of waste liquid

Inactive Publication Date: 2020-08-18
江苏兰诺磁业有限公司
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the active nature of the rare earth element neodymium in the NdFeB powder alloy, the corrosion resistance of the entire NdFeB alloy becomes very poor, especially in hot and humid environments. The decline or damage of the performance seriously affects the service life of the NdFeB permanent magnet material and reduces the stability and reliability of the product.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for coating the surface of a neodymium-iron-boron permanent magnet material with double-layer zinc, comprising the steps of:

[0022] S1. The NdFeB permanent magnet material is conventionally polished by mechanical vibration grinding or rolling chamfering, and at the same time, the nozzle is used to spray cooling liquid on the NdFeB permanent magnetic material. The cooling liquid includes degreasing agent with a concentration of 15ml / L and deionized water at a temperature of 50°C;

[0023] S2. Use deionized water to fully rinse the NdFeB permanent magnet material, and then immerse the NdFeB permanent magnet material in a mixture of clean water and antirust agent at a temperature of 40°C, and ultrasonically soak for 70s;

[0024] S3. Immerse the NdFeB permanent magnet material in the mixed solution of nitric acid for conventional pickling and rust removal, then soak it in 8ml / L hydrofluoric acid for 35s, remove the NdFeB permanent magnet material and wash it wit...

Embodiment 2

[0033] A method for coating the surface of a neodymium-iron-boron permanent magnet material with double-layer zinc, comprising the steps of:

[0034] S1. The NdFeB permanent magnet material is conventionally polished by mechanical vibration grinding or rolling chamfering, and at the same time, the nozzle is used to spray cooling liquid on the NdFeB permanent magnetic material. The cooling liquid includes a degreasing agent with a concentration of 25ml / L and deionized water at a temperature of 60°C;

[0035] S2. Use deionized water to fully rinse the NdFeB permanent magnet material, and then immerse the NdFeB permanent magnet material in a mixture of clean water and antirust agent at a temperature of 60°C, and ultrasonically soak for 80s;

[0036] S3. Immerse the NdFeB permanent magnet material in the mixed solution of nitric acid for conventional pickling and rust removal, then soak it in 12ml / L hydrofluoric acid for 45s, remove the NdFeB permanent magnet material and wash it ...

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

No PUM Login to View More

Abstract

The invention discloses a method for plating double-layer zinc on the surface of a NdFeB permanent magnet material. The method comprises the following steps that S1, the NdFeB permanent magnet material is subjected to conventional polishing, and cooling liquid is sprayed to the NdFeB permanent magnet material by using a spray head; S2, deionized water is adopted to comprehensively wash the NdFeB permanent magnet material, and then the NdFeB permanent magnet material is immersed in a mixed solution of clear water and an antirust agent at the temperature of 40-60 DEG C; S3, conventional picklingrust removal is carried out, and then the NdFeB permanent magnet material is soaked in 8-12ml / L of hydrofluoric acid for 35-45 s; S4, sulfate electrogalvanizing is performed on the NdFeB permanent magnet material to form a bottom zinc layer, and then sylvite galvanizing is carried out to form a surface zinc layer; and S5, the surface of the galvanized NdFeB permanent magnet material is passivated. According to the method, the surface of the NdFeB permanent magnet material is clean, and subsequent galvanization is facilitated; and the formula of the plating solution is non-toxic, the waste liquid treatment is simple and convenient, the process is simple and easy to master, a compact passivation film with a certain thickness is formed by passivating through the passivation solution, the corrosion resistance is quite high, and the damp-heat resistance is good.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of NdFeB permanent magnet materials, and more specifically relates to a method for coating the surface of NdFeB permanent magnet materials with double-layer zinc. 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. Due to the active nature of the rare earth element neodymium in the NdFeB powder alloy, the corrosion resistance of the entire NdFeB alloy becomes very poor, especially in hot and humid environments. The decline or damage of the performance seriously affects the service life of the NdFeB permanent magnet material and reduces the stability and reliability of the product. For this reason, we introduce a method of double-layer zinc coating o...

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
IPC IPC(8): C25D3/22C25D5/10C25D5/34C23G1/14C23G1/02C23C22/48B24B55/02H01F41/02C25D7/00
CPCB24B55/02C23C22/48C23G1/02C23G1/14C25D3/22C25D5/10C25D5/34C25D7/001H01F41/026
Inventor 魏佳祥
Owner 江苏兰诺磁业有限公司