Rare earth permanent magnet with multi-layer composite electroplating layer and method for composite electroplating thereof

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

Active Publication Date: 2018-12-18
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 multi-layer composite electroplating layer and method for composite electroplating thereof
  • Rare earth permanent magnet with multi-layer composite electroplating layer and method for composite electroplating 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 and 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 electroplating solution formula 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. 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 coating thickness is 7 microns.

[0019] ...

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 and 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 electroplating 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] Then wash with water, and use electroplating copper pyrophosphate to electroplate the second layer of copper coating. The formula of copper pyrophosphate is as follows: copper pyrophosphate 45 grams / liter, potassium pyrophosphate 240 grams / liter, copper concentration is 0.3mol / liter, pH 9.5, temperature 60 ℃, the coating thickness is...

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 and 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 electroplating 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]Then wash with water, and use electroplating copper pyrophosphate to electroplate the second layer of copper coating. The formula of copper pyrophosphate is as follows: copper pyrophosphate 75 g / L, potassium pyrophosphate 280 g / L, copper concentration 0.5 mol / L, pH 8.0, temperature 55 ℃, the coating thickness is 10 microns.

[0029] ...

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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 neodymium iron boron (NdFeB) permanent magnet materials is very rapid, and the success of the protection of NdFeB permanent magnet materials is related to one of the key technologies whether the material can be popularized and applied. 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-corros...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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