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
CN104073849BActive Publication Date: 2016-08-17湖南纳菲尔新材料科技股份有限公司
6 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
湖南纳菲尔新材料科技股份有限公司
Publication Date
2016-08-17

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More