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Process for chemically and compositely plating nickel, copper and phosphorus on sintered neodymium iron boron

A chemical composite plating, nickel-copper-phosphorus technology, applied in the field of material surface chemical treatment, can solve the problems of environmental protection, complicated process, poor effect, etc., and achieve the effect of bright coating, simple process and convenient operation

Inactive Publication Date: 2013-12-11
湖南航天有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the problems in the prior art that the process is complicated, not environmentally friendly, and the effect is not good, and provides a chemical composite nickel-copper-phosphorus plating process with simple process, low cost and wide application range, especially in the areas with many pores. Chemical composite nickel-copper-phosphorus plating on the surface of sintered NdFeB

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The surface of the 62.5×55×22 wind power generator sintered NdFeB magnet is chemically composite-plated with nickel-phosphorus-silicon oxide, and then nickel-copper-phosphorous. The steps are as follows:

[0024] (1) Baking oil: heat the workpiece to be plated to 300°C in a vacuum furnace and keep it warm for 2 hours;

[0025] (2) Pretreatment of the surface of the workpiece to be plated: grind the surface of the workpiece to be plated, and place it in a vibrating mill containing irregular alumina medium balls of different specifications. The water medium is deionized water containing 50g / L of sodium carbonate. Grind for 24 hours, rinse with flowing deionized water;

[0026] (3) Weak corrosion: Put the workpiece to be plated in a sulfuric acid solution with a concentration of 50g / L, soak it under ultrasonic waves for 1.5min, and then rinse it with hot deionized water;

[0027] (4) Re-degreasing: place the processed workpiece to be plated in an aqueous solution of sodiu...

Embodiment 2

[0034] The surface of sintered NdFeB φ30×10 is subjected to chemical compound nickel-phosphorus-alumina plating, and then chemical nickel-copper-phosphorus alloy plating. The steps are as follows:

[0035] (1) Oil drying: heat the workpiece to be plated to 200°C in a vacuum furnace and keep it warm for 2 hours;

[0036] (2) Pretreatment of the surface of the workpiece to be plated: grind the surface of the workpiece to be plated, and place it in a vibration mill containing irregular alumina media balls of different specifications. The water medium is deionized water containing 50g / L of sodium carbonate. Vibrated for 24 hours, rinsed with flowing deionized water;

[0037] (3) Weak corrosion: Put the workpiece to be plated in a sulfuric acid solution with a concentration of 30g / L, soak it under ultrasonic waves for 3 minutes, and then rinse it with hot water;

[0038] (4) Degreasing again: place the workpiece to be plated in an aqueous solution of sodium silicate with a mass frac...

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Abstract

The invention discloses a process for chemically and compositely plating nickel, copper and phosphorus on sintered neodymium iron boron. According to the process, nickel-phosphorus silica or alumina and a nickel-copper-phosphorus alloy are chemically plated on a sintered neodymium iron boron workpiece successively. The process comprises the following steps of: performing heat treatment on the workpiece, deoiling, polishing, performing weak corrosion, deoiling, activating, compositely plating the nickel-phosphorus silica or alumina, chemically plating the nickel-copper-phosphorus alloy, and performing heat treatment. The process is simple and environment-friendly, convenient to operate, low in cost, high in efficiency and wide in application range, the obtained plating is bright, flat, uniform and compact, and industrial production can be implemented.

Description

technical field [0001] The invention belongs to the field of surface chemical treatment of materials, and in particular relates to a sintered NdFeB chemical composite nickel-phosphorous plating process. Background technique [0002] Sintered NdFeB permanent magnet material is currently the permanent magnet material with the highest permanent magnetic performance. It is widely used in high-tech fields such as computer hard disks, microwave communications, wind power generators, and electric vehicles. The main components of sintered NdFeB permanent magnet materials are pure iron, rare earth metals neodymium, praseodymium, dysprosium and terbium, etc., and powder metallurgy technology is used in production; Compared with other metal materials, sintered NdFeB materials have poor compactness and a small amount of pores; all surface anti-corrosion technologies must deal with this characteristic. In the prior art, most of them are electroplated with zinc or nickel-copper-nickel on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/18C23C18/36C23C18/52
Inventor 胡娟舒阳会万绍平
Owner 湖南航天有限责任公司