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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, and long-term inspection by inspectors will cause adverse effects on eyes, etc.

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
Comparison scheme
Effect test

Embodiment 1

[0017] Will 2.3 kilograms of sintered NdFeB permanent magnet materials were first polished in a vibration mill for 2 hours. After degreasing and degreasing with sodium phosphate 20g / liter, sodium carbonate 10g / liter, sodium hydroxide 10g / liter, pickling in 1% nitric acid to remove surface oxides, washing with water, electroplating the first layer of nickel coating, electroplating nickel is ordinary electroplating Watt nickel, the formula of the electroplating 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] Then wash with water, and use electroplating copper pyrophosphate to electroplate the second layer of copper coating. 55°C, the coating thickness is 7 microns.

[0019] Next, use the bright nickel electroplating solution to electroplate the third layer of nickel coating. The formula of the bright nickel plating solution is as ...

Embodiment 2

[0022] Will 2.3 kilograms of sintered NdFeB permanent magnet materials were first polished in a vibration mill for 2 hours. After degreasing and degreasing with sodium phosphate 20g / liter, sodium carbonate 10g / liter, sodium hydroxide 10g / liter, pickling in 1% nitric acid to remove surface oxides, washing with water, electroplating the first layer of nickel coating, electroplating nickel is ordinary electroplating Watt nickel, the formula of the electroplating solution 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] Then wash with water, and use electroplating copper pyrophosphate to electroplate the second layer of copper coating. 60°C, coating thickness 10 microns.

[0024] Next, use the bright nickel electroplating solution to electroplate the third layer of nickel coating. The formula of the bright nickel plating solution is as follow...

Embodiment 3

[0027] Will 2.3 kilograms of sintered NdFeB permanent magnet materials were first polished in a vibration mill for 2 hours. After degreasing and degreasing with sodium phosphate 20g / liter, sodium carbonate 10g / liter, sodium hydroxide 10g / liter, pickling in 1% nitric acid to remove surface oxides, washing with water, electroplating the first layer of nickel coating, electroplating nickel is ordinary electroplating Watt nickel, the formula of the electroplating solution 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]Then wash with water, and use electroplating copper pyrophosphate to electroplate the second layer of copper coating. 55°C, the coating thickness is 10 microns.

[0029] Then, the third layer of nickel coating is electroplated with a semi-bright nickel plating solution. The formula of the semi-bright nickel plating solution is ...

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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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