Rare earth permanent magnet with multilayer composite electroplated coating and composite electroplating method thereof

A rare earth permanent magnet, multi-layer composite technology, used in the manufacture of permanent magnets, magnetic objects, permanent magnets, etc., can solve problems such as adverse effects on eyes, and achieve uniform appearance, improved corrosion resistance, and black and bright colors.

Active Publication Date: 2015-05-20
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

Generally, NdFeB permanent magnets are brightened by electroplating nickel, a

Method used

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  • Rare earth permanent magnet with multilayer composite electroplated coating and composite electroplating method thereof
  • Rare earth permanent magnet with multilayer composite electroplated coating and composite electroplating method thereof

Examples

Experimental program
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Example Embodiment

[0016] Example 1

[0017] Will 2.3 kg of sintered NdFeB permanent magnet material was first polished in a vibrating mill for 2 hours. After degreasing and degreasing by sodium phosphate 20g / L, sodium carbonate 10g / L, sodium hydroxide 10g / L, pickling in 1% nitric acid to remove surface oxides, washing with water, electroplating the first layer of nickel plating, electroplating nickel is ordinary electroplating Watt nickel, the formula of the plating solution is as follows: nickel sulfate 275 g / L, nickel chloride 30 g / L, boric acid 40 g / L, pH 3.5, temperature 60 °C, nickel concentration 2.0 mol / L, nickel plating thickness 5 microns .

[0018] After washing with water, the second layer of copper plating is electroplated with copper pyrophosphate. The formula of copper pyrophosphate is as follows: copper pyrophosphate 90 g / L, potassium pyrophosphate 320 g / L, copper concentration 0.6 mol / L, pH 7.0, temperature 55℃, the thickness of the coating is 7 microns.

[0019] Next, the ...

Example Embodiment

[0021] Example 2

[0022] Will 2.3 kg of sintered NdFeB permanent magnet material was first polished in a vibrating mill for 2 hours. After degreasing and degreasing by sodium phosphate 20g / L, sodium carbonate 10g / L, sodium hydroxide 10g / L, pickling in 1% nitric acid to remove surface oxides, washing with water, electroplating the first layer of nickel plating, electroplating nickel is ordinary electroplating Watt nickel, the plating solution formula is as follows: nickel sulfate 150 g / L, nickel chloride 20 g / L, boric acid 40 g / L, pH 4.5, temperature 35 °C, nickel concentration 1.0 mol / L, nickel plating thickness 3 microns .

[0023] After washing with water, the second layer of copper plating is electroplated with copper pyrophosphate. The formula of copper pyrophosphate is as follows: copper pyrophosphate 45 g / L, potassium pyrophosphate 240 g / L, copper concentration 0.3 mol / L, pH 9.5, temperature 60 ℃, coating thickness 10 microns.

[0024] Next, the bright nickel plati...

Example Embodiment

[0026] Example 3

[0027] Will 2.3 kg of sintered NdFeB permanent magnet material was first polished in a vibrating mill for 2 hours. After degreasing and degreasing with sodium phosphate 20g / L, sodium carbonate 10g / L, and sodium hydroxide 10g / L, pickling in 1% nitric acid to remove surface oxides, washing with water, and electroplating the first layer of nickel plating. Nickel electroplating is ordinary electroplating Watt nickel, the plating solution formula is as follows: nickel sulfate 200 g / L, nickel chloride 30 g / L, boric acid 40 g / L, pH 3.5, temperature 55 °C, nickel concentration 1.5 mol / L, nickel plating thickness 4 microns .

[0028]After washing with water, the second layer of copper plating is electroplated with copper pyrophosphate. The formula of copper pyrophosphate is as follows: copper pyrophosphate 75 g / L, potassium pyrophosphate 280 g / L, copper concentration 0.5mol / L, pH 8.0, temperature 55 ℃, coating thickness 10 microns.

[0029] Next, first use the s...

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Abstract

The invention provides a rare earth permanent magnet with a multilayer composite electroplated coating and a composite electroplating method thereof. The rare earth permanent magnet includes a rare earth permanent magnet body, a first layer of nickel coating, a second layer of copper coating, a third layer of nickel coating and a fourth layer. An electroplating solution includes: 40-60g/L stannous pyrophosphate, 30-45g/L nickel chloride, 250-320g/L potassium pyrophosphate, and 20g/L glycine. The composite electroplated coating not only can play an anti-corrosion role of conventional electroplated nickel, but also has certain protection effect on the eyes of inspectors, and the uniform appearance and black and shiny color can reach certain decorative effect.

Description

technical field [0001] The invention relates to the field of surface treatment of materials, in particular to a rare earth permanent magnet with a multilayer composite electroplating layer and a composite electroplating method thereof. Background technique [0002] In recent years, the application and development of NdFeB permanent magnet materials has been very rapid, and the success of the protection of NdFeB permanent magnet materials is one of the key technologies related to the promotion and application of materials. 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 perma...

Claims

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Application Information

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IPC IPC(8): C25D5/14H01F1/057H01F41/02
CPCC25D5/14H01F1/0572H01F7/02H01F41/026
Inventor 白晓刚
Owner TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD
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