Bonded neodymium-iron-boron magnet with good corrosion resistance

Abstract

The utility model relates to a bonded neodymium-iron-boron magnet with good corrosion resistance, which belongs to the technical field of neodymium-iron-boron magnets and comprises a ring body, a gold layer is plated on the outer side of the ring body, the ring body is composed of an upper ring body and a lower ring body, an upper groove is formed in the upper ring body, a lower groove communicated with the upper groove is formed in the lower ring body, and the gold layer is plated on the outer side of the ring body. And the upper ring body and the lower ring body are respectively provided with an adsorption bag in the upper groove and the lower groove. The corrosion-resistant coating has the advantages of being good in corrosion resistance and long in service life.

Description

Technical Field

[0001] The utility model relates to a bonded NdFeB magnet with good anti-corrosion performance, belonging to the technical field of NdFeB magnets. Background Art

[0002] Neodymium iron boron magnets, also known as NdFeB magnets, are tetragonal crystals formed by neodymium, iron and boron. NdFeB magnets are permanent magnets with magnetic properties second only to absolute zero holmium magnets. They are also the most commonly used rare earth magnets. NdFeB magnets are widely used in electronic products such as hard drives, mobile phones, headphones, and battery-powered tools.

[0003] A related Chinese patent with the announcement number CN201655461U discloses a neodymium iron boron magnet used in a motor, a sensor or a wind turbine. The magnet includes a copper layer, and a nickel layer is plated outside the copper layer. The nickel layer and the copper layer are matched and fixedly connected.

[0004] The inventor believes that when using the above-mentioned NdFeB magnets, due to their poor compactness and the presence of some pores, although they are plated with nickel and copper layers on their surfaces, they are still very susceptible to corrosion, thereby affecting the service life of the above-mentioned NdFeB magnets. Utility Model Content

[0005] The utility model aims at the deficiencies in the prior art and provides a bonded NdFeB magnet with good anti-corrosion performance.

[0006] The utility model solves the above-mentioned technical problem with the following technical solution: a bonded NdFeB magnet with good corrosion resistance, comprising a ring body, the outer side of the ring body being plated with a gold layer, the ring body being composed of an upper ring body and a lower ring body, the upper ring body being provided with an upper groove, the lower ring body being provided with a lower groove connected to the upper groove, the upper ring body and the lower ring body being provided with adsorption bags in the upper groove and the lower groove respectively.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows:

[0008] Furthermore, the outer side of the gold layer is coated with an epoxy resin layer.

[0009] Furthermore, the thickness of the gold layer is M, the thickness of the epoxy resin layer is N, and N≥3M.

[0010] Furthermore, a bottom plate is provided at the lower end of the lower ring body, a drying cavity is provided in the bottom plate, a plurality of through holes are provided in the bottom plate, and drying particles are provided in the drying cavity of the bottom plate.

[0011] Furthermore, a column located inside the ring body is provided at the upper end of the bottom plate.

[0012] Furthermore, a cavity is provided in the column, and oxygen absorbing particles are provided in the cavity of the column.

[0013] Furthermore, a connecting column is provided at the lower end of the column, and the connecting column is threadedly connected to the bottom plate.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The present application sets a gold layer on the outside of the ring body, and sets an epoxy resin layer on the outside of the gold layer, and the thickness of the epoxy resin layer is N, the thickness of the gold layer is M, N ≥ 3M. Through the above settings, the thickness of the epoxy resin layer is much greater than the thickness of the gold layer, and the epoxy resin layer can reduce the wear of the gold layer. The gold layer is relatively dense and can effectively isolate the NdFeB magnet from oxygen, thereby reducing the problem of easy rust of the NdFeB magnet. The epoxy resin layer and the gold layer can improve the corrosion resistance of the NdFeB magnet, thereby ensuring the service life of the NdFeB magnet;

[0016] 2. The present application sets an upper groove and a lower groove on the upper ring body and the lower ring body, and sets an adsorption bag in the upper groove and the lower groove. The substance filled in the adsorption bag is a calcium chloride desiccant, which can absorb water vapor in the air near the upper ring body and the lower ring body, thereby reducing the water content near the upper ring body and the lower ring body, thereby reducing the problem of rust on the upper ring body and the lower ring body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a bonded NdFeB magnet with good corrosion resistance in an embodiment of the present application;

[0018] Figure 2 Schematic diagram of the structure of the epoxy resin layer in the embodiment of the present application.

[0019] In the figure, 1, ring body; 11, gold layer; 12, epoxy resin layer; 21, upper ring body; 22, lower ring body; 23, upper groove; 24, lower groove; 25, adsorption bag; 3, bottom plate; 31, drying chamber; 32, drying particles; 4, column; 41, cavity; 42, oxygen-absorbing particles; 5, connecting column; 51, bottom column. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] like Figure 1 and Figure 2 As shown, a bonded NdFeB magnet with good corrosion resistance includes a ring body 1, a gold layer 11 is plated on the outer side of the ring body 1, an epoxy resin layer 12 is coated on the outer side of the gold layer 11, the thickness of the epoxy resin layer 12 is N, the thickness of the gold layer 11 is M, N≥3M, through the above configuration, the thickness of the epoxy resin layer 12 is much greater than the thickness of the gold layer 11, the epoxy resin layer 12 can reduce the wear of the gold layer 11, the thickness of the gold layer 11 is less than the epoxy resin layer 12, the amount of gold used can be reduced, and the cost can be reduced; in addition, the gold layer 11 is relatively dense, which can effectively isolate the NdFeB magnet from oxygen, thereby reducing the problem of easy rust of the NdFeB magnet, and the epoxy resin layer 12 cooperates with the gold layer 11 to improve the corrosion resistance of the NdFeB magnet, thereby ensuring the service life of the NdFeB magnet.

[0023] like Figure 1 and Figure 2 As shown, the ring body 1 is composed of an upper ring body 21 and a lower ring body 22. The upper ring body 21 is provided with an upper groove 23, and the lower ring body 22 is provided with a lower groove 24 connected to the upper groove 23. The upper ring body 21 and the lower ring body 22 are respectively provided with adsorption bags 25 in the upper groove 23 and the lower groove 24. The substance filled in the adsorption bag 25 is a calcium chloride desiccant, which can absorb water vapor in the air near the upper ring body 21 and the lower ring body 22, thereby reducing the water content near the upper ring body 21 and the lower ring body 22, thereby reducing the problem of rust on the upper ring body 21 and the lower ring body 22.

[0024] like Figure 1 and Figure 2 As shown, a bottom plate 3 is provided at the lower end of the lower ring body 22, a drying chamber 31 is provided in the bottom plate 3, a plurality of through holes are provided in the bottom plate 3, and drying particles 32 are provided in the drying chamber 31 of the bottom plate 3. The drying particles 32 are composed of silica gel and activated alumina. The drying particles 32 arranged in the bottom plate 3 can absorb moisture around the upper ring body 21 and the lower ring body 22 through the through holes, which can further reduce the water content near the NdFeB magnet, thereby reducing the problem of easy rust of the NdFeB magnet when placed under natural conditions, thereby further ensuring the service life of the NdFeB magnet.

[0025] like Figure 1 and Figure 2As shown, a column 4 located in the ring body 1 is provided at the upper end of the bottom plate 3, a cavity 41 is opened in the column 4, and oxygen absorbing particles 42 are provided in the cavity 41 of the column 4. The oxygen absorbing particles 42 are composed of an iron-based deoxidizer. The oxygen absorbing particles 42 can absorb oxygen near the NdFeB magnet, and can reduce the oxygen content near the NdFeB magnet, thereby reducing the problem of rusting of the NdFeB magnet when it is exposed to the air and the oxygen in the air, thereby reducing the problem of rusting of the NdFeB magnet, thereby fundamentally ensuring the service life of the NdFeB magnet.

[0026] like Figure 1 and Figure 2 As shown, a connecting column 5 is provided at the lower end of the column 4, and a bottom column 51 is provided at the upper end of the bottom plate 3. The connecting column 5 is threadedly connected to the bottom column 51. After the oxygen-absorbing particles 42 are used for a long time, as the iron-based deoxidizer reacts with oxygen, the deoxidation effect will gradually be lost. Therefore, the column 4 arranged at the upper end of the bottom column 51 can be rotated and unscrewed, and after replacing new oxygen-absorbing particles 42, the column 4 can be tightened on the bottom column 51.

[0027] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0028] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A bonded NdFeB magnet with good corrosion resistance, characterized in that: The invention comprises a ring body (1), the outer side of the ring body (1) is plated with a gold layer (11), the ring body (1) is composed of an upper ring body (21) and a lower ring body (22), the upper ring body (21) is provided with an upper groove (23), the lower ring body (22) is provided with a lower groove (24) connected to the upper groove (23), and the upper ring body (21) and the lower ring body (22) are provided with adsorption bags (25) in the upper groove (23) and the lower groove (24), respectively.

2. A bonded NdFeB magnet with good corrosion resistance according to claim 1, characterized in that: The outer side of the gold layer (11) is coated with an epoxy resin layer (12).

3. A bonded NdFeB magnet with good corrosion resistance according to claim 2, characterized in that: The thickness of the gold layer (11) is M, the thickness of the epoxy resin layer (12) is N, and N≥3M.

4. A bonded NdFeB magnet with good corrosion resistance according to claim 1, characterized in that: A bottom plate (3) is provided at the lower end of the lower ring body (22), a drying chamber (31) is provided in the bottom plate (3), a plurality of through holes are provided in the bottom plate (3), and drying particles (32) are provided in the drying chamber (31) of the bottom plate (3).

5. A bonded NdFeB magnet with good corrosion resistance according to claim 4, characterized in that: The upper end of the bottom plate (3) is provided with a column (4) located inside the ring body (1).

6. A bonded NdFeB magnet with good corrosion resistance according to claim 5, characterized in that: A cavity (41) is provided in the column (4), and oxygen absorbing particles (42) are provided in the cavity (41) of the column (4).

7. A bonded NdFeB magnet with good corrosion resistance according to claim 6, characterized in that: A connecting column (5) is provided at the lower end of the column (4), and the connecting column (5) is threadedly connected to the bottom plate (3).

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