A process for electroplating nickel-tungsten-phosphorus on the surface of sintered NdFeB magnets

A technology of NdFeB and nickel electroplating, which is applied in the field of electroplating nickel-tungsten phosphorus on the surface of sintered NdFeB magnets, can solve the problems of poor performance and poor corrosion resistance of NdFeB magnets, and achieve reduced production costs, good bonding force, and avoid The effect of corrosion

Active Publication Date: 2016-08-17
湖南纳菲尔新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the poor ability of the surface of the NdFeB magnet to combine with the nickel-tungsten-phosphorus alloy coating in the prior art, resulting in poor corrosion resistance of the NdFeB magnet, the purpose of the present invention is to provide a simple treatment for the surface of the NdFeB magnet, A method that can effectively homogenize the surface of NdFeB magnets, enhance the bonding force between the surface of NdFeB magnets and the nickel-tungsten-phosphorus alloy coating, and improve the corrosion resistance of NdFeB magnets

Method used

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  • A process for electroplating nickel-tungsten-phosphorus on the surface of sintered NdFeB magnets
  • A process for electroplating nickel-tungsten-phosphorus on the surface of sintered NdFeB magnets
  • A process for electroplating nickel-tungsten-phosphorus on the surface of sintered NdFeB magnets

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Embodiment 1

[0032] A process method for electroplating nickel-tungsten-phosphorus on the surface of a sintered NdFeB magnet, comprising the following steps:

[0033] (1) Grind the grease, scale, rust products, and corners on the surface of the NdFeB magnet to 2000# to obtain a uniform and fresh magnet surface, and then clean it with ultrasonic or water;

[0034] (2) Chemical alkaline degreasing treatment, preparing alkaline degreasing liquid, including sodium hydroxide 10g / L, sodium phosphate 150g / L, sodium carbonate 50g / L, surfactant 0.3g / L, balance for water. Wherein the surfactant is sodium dodecylsulfonate. The water is distilled water or deionized water; heat the alkaline degreasing solution to 65°C, wash the polished NdFeB magnet in the alkaline degreasing solution for 5 minutes, and then wash it three times with ultrasonic waves, in which the first step is 50 ℃ hot water washing;

[0035] (3) Acidic activation treatment, prepare an acidic activation solution, the liquid includes...

Embodiment 2

[0038] A process method for electroplating nickel-tungsten-phosphorus on the surface of a sintered NdFeB magnet, comprising the following steps:

[0039] (1) Grind the grease, scale, rust products, and corners on the surface of the NdFeB magnet to 2000# to obtain a uniform and fresh magnet surface, and then clean it with ultrasonic or water;

[0040] (2) Chemical alkaline degreasing treatment, preparing alkaline degreasing liquid, including sodium hydroxide 8g / L, sodium phosphate 150g / L, sodium carbonate 50g / L, surfactant 0.5g / L, balance for water. Wherein the surfactant is octylphenol polyoxyethylene ether-10 (OP-10). The water is distilled water or deionized water; heat the alkaline degreasing solution to 70°C, wash the polished NdFeB magnet in the alkaline degreasing medium for 8 minutes, and then wash it three times with ultrasonic waves. ℃ hot water washing;

[0041] (3) Acidic activation treatment, prepare acidic activation solution, the liquid includes oxalic acid 70...

Embodiment 3

[0044] A process method for electroplating nickel-tungsten-phosphorus on the surface of a sintered NdFeB magnet, comprising the following steps:

[0045] (1) Grind the grease, scale, rust products, and corners on the surface of the NdFeB magnet to 2000# to obtain a uniform and fresh magnet surface, and then clean it with ultrasonic or water;

[0046] (2) Chemical alkaline degreasing treatment, preparing alkaline degreasing liquid, including sodium hydroxide 6g / L, sodium phosphate 120g / L, sodium carbonate 80g / L, surfactant 0.5g / L, balance for water. Wherein the surfactant is sodium dodecylsulfonate. The water is distilled water or deionized water; heat the alkaline degreasing solution to 65°C, wash the polished NdFeB magnet in the alkaline degreasing medium for 5 minutes, and then wash it three times with ultrasonic waves, of which the first step is 50 ℃ hot water washing;

[0047] (3) Acidic activation treatment, prepare acidic activation solution, the liquid includes oxali...

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Abstract

The invention discloses a process for electroplating nickel-tungsten phosphorus on the surface of a sintered NdFeB magnet. In the process, the surface of the sintered NdFeB magnet is polished, alkaline degreased, and hot water washed successively, and then placed in an oxalic acid solution , soaking or ultrasonic activation treatment, electroplating nickel-tungsten phosphorus alloy coating on the surface of the sintered NdFeB magnet after activation treatment; The surface of the iron-boron magnet is homogenized, the bonding force between the surface of the NdFeB magnet and the nickel-tungsten-phosphorus alloy coating is enhanced, and the corrosion resistance of the NdFeB magnet is improved. The process is simple, the production cost is low, and it can be applied industrially.

Description

technical field [0001] The invention relates to a process for electroplating nickel-tungsten-phosphorus on the surface of a sintered NdFeB magnet, belonging to the field of surface treatment of metal materials. Background technique [0002] In 1983, Sagawa et al. used powder metallurgy to develop high-performance NdFeB series permanent magnets for the first time in Japan, setting a new record for the performance of permanent magnets. Once it came out, it developed rapidly and dominated the magnetic material industry market. Its status has given it a broad market prospect in modern industry and electronic technology. However, due to the loose and porous surface of NdFeB magnetic materials, strong chemical activity, and easy oxidation and corrosion, many defects seriously affect its application range. Therefore, the prerequisite for the wide application of NdFeB materials is to first solve the fatal defect of magnets not being resistant to corrosion. [0003] NdFeB magnets a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/36
Inventor 何凤姣陈幸
Owner 湖南纳菲尔新材料科技股份有限公司
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