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Method for white copper-tin electroplating on permanent magnetic material

A technology of permanent magnet material and cupronickel, which is applied in the field of anticorrosion of permanent magnet material, to achieve the effect of saving electroplating cost and good anticorrosion effect

Active Publication Date: 2014-12-17
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

No copper-nickel tin found in NdFeB alloy plating

Method used

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  • Method for white copper-tin electroplating on permanent magnetic material

Examples

Experimental program
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Effect test

Embodiment 1

[0018] First put 2.5kg The sintered NdFeB permanent magnet material was mechanically vibrated in a vibration mill for 2 hours, then degreased and degreased with an alkaline solution (sodium phosphate 20g / L, sodium carbonate 10g / L and sodium hydroxide 10g / L), and then in Pickling in 1% nitric acid solution, electroplating nickel, see (CN200910244404) for details, using Watt nickel formula nickel sulfate 220 g / l, nickel chloride 40 g / l, boric acid 40 g / l, pH 4.8 temperature 42°C. The thickness of the nickel layer is 5 microns, and electroplating copper is carried out after washing with water. The formulation of the electroplating solution is as follows: copper pyrophosphate 60 g / L, potassium pyrophosphate 300 g / L, pH 8.2, temperature 50°C, and the thickness of the electroplated copper layer is 7 microns. Electroplated copper-tin alloy after water washing. Copper-tin alloy plating solution includes Cu 2 P 2 o 7 ·3H 2 O16g / L, Sn 2 P 2 o 7 12g / L, K 4 P 2 o 7 ·3H 2 O20...

Embodiment 2

[0021] According to the method of embodiment 1 to 2.5kg The NdFeB permanent magnet material is subjected to surface pretreatment, and the surface of the permanent magnet material is nickel-plated and then copper-plated, and copper-tin alloy is electroplated after washing with water. Electroplated copper-tin alloy after water washing. Copper-tin alloy plating solution includes Cu 2 P 2 o 7 ·3H 2 O19g / L, Sn 2 P 2 o 7 15g / L, K 4 P 2 o 7 ·3H 2 O250g / L, K 2 HPO 4 80g / L, complexing agent FCS-A120ml / L, stabilizer FCS-B30ml / L, brightener FCS-C20ml / L (complexing agent FCS-A, stabilizer FCS-B and brightener FCS-C are all purchased from obtained from Guangzhou Medis). The electroplating temperature is 25° C., the pH is 8.5, and the thickness of the Cu—Sn alloy plating layer is 20 μm.

[0022] It can be seen from the neutral salt spray test that the NdFeB permanent magnet obtained by the surface protection method of the NdFeB permanent magnet of the present invention has a...

Embodiment 3

[0024] According to the method of embodiment 1 to 2.5kg The NdFeB permanent magnet material is subjected to surface pretreatment, and the surface of the permanent magnet material is nickel-plated and then copper-plated, and copper-tin alloy is electroplated after washing with water. Electroplated copper-tin alloy after water washing. Copper-tin alloy plating solution includes Cu 2 P 2 o 7 ·3H 2 O17g / L, Sn 2 P 2 o 7 14g / L, K 4 P 2 o 7 ·3H 2 O220g / L, K 2 HPO 4 70g / L, complexing agent FCS-A100ml / L, stabilizer FCS-B20ml / L, brightener FCS-C16ml / L (complexing agent FCS-A, stabilizer FCS-B and brightener FCS-C are all purchased from obtained from Guangzhou Medis). The temperature of the electroplating is 22° C., the pH is 8.6, and the thickness of the Cu—Sn alloy plating layer is 12 μm.

[0025] It can be seen from the neutral salt spray test that the NdFeB permanent magnet obtained by the surface protection method of the NdFeB permanent magnet of the present inventio...

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Abstract

The invention relates to a method for white copper-tin electroplating on a permanent magnetic material, wherein the method comprises the following steps: (1) chamfering and polishing; (2) degreasing and removing oil; (3) pickling and derusting; (4) carrying out acid liquid activation; (5) electronickelling to form a nickel-plated layer; (6) electrocoppering to form a copper-plated layer; and (7) electroplating with a Cu-Sn alloy to form a Cu-Sn alloy-plated layer: adopting a Cu-Sn alloy electroplating solution, electroplating the permanent magnetic material formed with the copper-plated layer to form the Cu-Sn alloy-plated layer. After the treatment, the electroplating binding force of the plated layer is the same as that of electronickelling; the anticorrosion ability of the plated layer is the same as that of multilayer nickel electroplating; and 20% of electroplating costs can be saved, and using problems of a crowd allergic to nickel is avoided.

Description

technical field [0001] The invention relates to an anticorrosion method for permanent magnet materials, in particular to a method for electroplating cupronickel tin on an NdFeB permanent magnet. 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 permanent magnet materials. As a porous mater...

Claims

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Application Information

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IPC IPC(8): C25D5/12C25D3/56
Inventor 白晓刚潘广麾
Owner TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD
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