A kind of method for electroplating cupronickel tin on permanent magnet 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: 2018-05-01
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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  • A kind of method for electroplating cupronickel tin on permanent magnet material

Examples

Experimental program
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Effect test

Embodiment 1

[0018] First, 2.5kg of ￠24×￠15×18mm sintered NdFeB permanent magnet materials were mechanically vibrated in a vibrating mill for 2 hours, and then were washed with an alkaline solution (sodium phosphate 20g / L, sodium carbonate 10g / L and hydrogen Sodium oxide 10g / L) degreasing and degreasing, then 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 O 16g / L, Sn 2 P 2 o 7 12g / ...

Embodiment 2

[0021] According to the method of embodiment 1, carry out surface pretreatment to the NdFeB permanent magnet material of 2.5kg ￠ 24 * ￠ 15 * 18mm, adopt nickel plating on the surface of permanent magnet material and then electroplate copper, electroplate copper-tin alloy after water washing. 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-A 120ml / L, stabilizer FCS-B 30ml / L, brightener FCS-C 20ml / L (complexing agent FCS-A, stabilizer FCS-B and brightener FCS-C Both were purchased 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 g...

Embodiment 3

[0024] According to the method of embodiment 1, carry out surface pretreatment to the NdFeB permanent magnet material of 2.5kg ￠ 24 * ￠ 15 * 18mm, adopt nickel plating on the surface of permanent magnet material and then electroplate copper, electroplate copper-tin alloy after water washing. 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-A 100ml / L, stabilizer FCS-B 20ml / L, brightener FCS-C 16ml / L (complexing agent FCS-A, stabilizer FCS-B and brightener FCS-C Both were purchased 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 invention ...

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Abstract

The invention relates to a method for electroplating cupronickel tin on permanent magnet materials, which comprises the following steps: (1) chamfering and polishing; (2) degreasing and degreasing; (3) pickling and derusting; (4) acid solution activation; ( 5) electroplating nickel to form nickel-plated layer; (6) electroplating copper to form copper-plated layer; The magnetic material is electroplated to form a Cu‑Sn alloy coating. After this treatment, the electroplating binding force of the coating is the same as that of electroplating nickel; the anti-corrosion ability of the coating is the same as that of electroplating multi-layer nickel; and it can save 20% of electroplating costs, and avoid problems in the use of people who are allergic to nickel.

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 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-corrosion problem of NdFeB permanent magnet mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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