Corrosion-resistant neodymium iron boron magnet

Abstract

The corrosion-resistant neodymium-iron-boron magnet comprises a magnet body of a cuboid structure, a nickel plating layer and a corrosion-resistant coating are sequentially arranged on the surface of the magnet body, and a polytetrafluoroethylene coating and a wear-resistant coating are arranged outside the corrosion-resistant coating. A latticed glass fiber layer is arranged between the corrosion-resistant coating and the polytetrafluoroethylene coating; the surface of the magnet body is also provided with a group of annular partition grooves which are distributed side by side. The utility model has the characteristic that the corrosion resistance can be effectively improved.

Description

Technical Field

[0001] The utility model relates to a neodymium iron boron magnet, in particular to a corrosion-resistant neodymium iron boron magnet. Background Art

[0002] NdFeB magnets can be categorized as bonded and sintered. Bonding is essentially injection molding, while sintering involves vacuum molding and high-temperature heating. NdFeB magnets possess the strongest magnetic force to date, but their surfaces are susceptible to rust and exhibit only moderate corrosion resistance. To improve corrosion resistance, protective surface treatments such as nickel plating and epoxy coatings are often applied. However, these typically consist of a single-layer structure, which is susceptible to wear and tear. Once worn, they are susceptible to corrosion and rust. Consequently, existing technologies suffer from poor corrosion resistance. Summary of the Invention

[0003] The purpose of the utility model is to provide a corrosion-resistant NdFeB magnet. The utility model has the characteristic of being able to effectively improve the corrosion resistance.

[0004] The technical solution of the utility model is as follows: a corrosion-resistant NdFeB magnet comprises a magnet body with a rectangular structure, a nickel-plated layer and a corrosion-resistant coating are sequentially provided on the surface of the magnet body, a polytetrafluoroethylene coating and a wear-resistant coating are provided outside the corrosion-resistant coating; a grid-shaped glass fiber layer is provided between the corrosion-resistant coating and the polytetrafluoroethylene coating; and a group of annular partition grooves distributed side by side are also provided on the surface of the magnet body.

[0005] In the aforementioned corrosion-resistant NdFeB magnet, a self-repairing anti-corrosion coating is provided between the polytetrafluoroethylene coating and the wear-resistant coating.

[0006] In the aforementioned corrosion-resistant NdFeB magnet, a corrosion-resistant coating is also provided in the annular partition groove.

[0007] Compared with the prior art, the present invention can effectively improve the wear resistance and corrosion resistance of the magnet as a whole by arranging a nickel plating layer, a corrosion-resistant coating, a polytetrafluoroethylene coating and a wear-resistant coating on the outside of the magnet body; at the same time, the present application can not only improve the adhesion performance but also further improve the corrosion resistance by arranging a grid-shaped glass fiber layer between the corrosion-resistant coating and the polytetrafluoroethylene coating; by arranging a group of annular partition grooves distributed side by side on the surface of the magnet body, the adhesion performance of the corrosion-resistant coating can be further improved to prevent it from falling off, thereby improving the corrosion resistance. Moreover, the arrangement of the annular partition grooves can also slow down the spread of corrosion on the surface of the magnet. In summary, the present invention has the characteristics of being able to effectively improve the corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1It is a structural diagram of the present utility model.

[0009] The markings in the accompanying drawings are: 1-magnet body, 2-nickel plating layer, 3-corrosion-resistant coating, 4-polytetrafluoroethylene coating, 5-wear-resistant coating, 6-glass fiber layer, 7-annular partition groove, 8-self-repairing anti-corrosion coating. DETAILED DESCRIPTION

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0011] Example. Corrosion-resistant NdFeB magnets, comprising Figure 1 As shown, it includes a magnet body 1 with a rectangular structure, and a nickel plating layer 2 and a corrosion-resistant coating 3 are sequentially provided on the surface of the magnet body 1. A polytetrafluoroethylene coating 4 and a wear-resistant coating 5 are provided outside the corrosion-resistant coating 3; a grid-shaped glass fiber layer 6 is provided between the corrosion-resistant coating 3 and the polytetrafluoroethylene coating 4; and a group of annular partition grooves 7 distributed side by side are also provided on the surface of the magnet body 1.

[0012] A self-repairing anti-corrosion coating 8 is provided between the polytetrafluoroethylene coating 4 and the wear-resistant coating 5. When wear occurs, the corrosion-resistant coating can be repaired by self-repairing, thereby extending the duration of corrosion resistance.

[0013] The annular partition groove 7 is also provided with a corrosion-resistant coating 3 .

[0014] Preferably, wedge-shaped grooves may be provided on both sides of the magnet body. When splicing is required, two adjacent magnet bodies can be spliced ​​together using a splicing block with wedge-shaped heads on both sides.

[0015] The wear-resistant coating is a ceramic nano coating.

[0016] Self-healing anti-corrosion coatings are endogenous and can be used with common commercially available endogenous self-healing coatings. They primarily disperse a repair agent directly within the coating matrix. When the coating is damaged, the repair agent reacts directly with the surface to repair the damage. The repair agent is typically encapsulated in microcapsules (tiny spherical structures typically made of polymers, ceramics, etc.). The microcapsule walls prevent leakage of the repair agent, but they rupture to release the agent when the coating is damaged.

[0017] The corrosion resistant coating is epoxy resin coating.

[0018] The depth of the annular partition groove is 3-5 mm.

[0019] The preparation process of the utility model is as follows: during the production process of the magnet body, a specific mold is used to make a magnet body with a rectangular structure having an annular partition groove on the surface, and then nickel is plated on the surface of the magnet body and the wall of the annular partition groove, and then a corrosion-resistant coating is applied on the surface of the magnet body and inside the annular partition groove, and then a glass fiber layer is adhered and then a polytetrafluoroethylene coating, a self-repairing anti-corrosion coating and a wear-resistant coating are applied in sequence to obtain a finished product.

Claims

1. Corrosion-resistant NdFeB magnets, characterized by: The invention comprises a magnet body (1) with a rectangular parallelepiped structure, wherein a nickel plating layer (2) and a corrosion-resistant coating (3) are sequentially provided on the surface of the magnet body (1), and a polytetrafluoroethylene coating (4) and a wear-resistant coating (5) are provided outside the corrosion-resistant coating (3); a grid-shaped glass fiber layer (6) is provided between the corrosion-resistant coating (3) and the polytetrafluoroethylene coating (4); and a group of annular partition grooves (7) distributed side by side are also provided on the surface of the magnet body (1).

2. The corrosion-resistant NdFeB magnet according to claim 1, characterized in that: A self-repairing anti-corrosion coating (8) is also provided between the polytetrafluoroethylene coating (4) and the wear-resistant coating (5).

3. The corrosion-resistant NdFeB magnet according to claim 1, wherein: A corrosion-resistant coating (3) is also provided in the annular partition groove (7).

Images