Neodymium iron boron magnet, motor and fishing tackle

Abstract

The utility model provides a neodymium iron boron magnet, a motor and a fishing tackle. The neodymium-iron-boron magnet comprises a magnet body; the nickel layer coats the surface of the magnet body; the surface of the nickel layer is coated with the copper layer; the nickel-phosphorus layer is coated on the surface of the copper layer; wherein the thickness of the copper layer is 10-20 microns. Through the composite design of the nickel layer, the copper layer and the nickel-phosphorus layer, the compactness of the plating layer is improved, and the middle copper layer is thick, so that the corrosion resistance of the neodymium-iron-boron magnet can be effectively improved under the condition that only three plating layers exist.

Description

Technical Field

[0001] This utility model relates to the field of neodymium iron boron magnet technology, and in particular to a neodymium iron boron magnet with a coating on its surface, a motor, and fishing tackle. Background Technology

[0002] Neodymium iron boron (NdFeB) magnets possess strong magnetization and are considered the best-performing magnet material in the world, making them widely used. However, NdFeB magnets exhibit poor resistance to environmental corrosion, particularly in chloride-containing corrosive media, where corrosion is accelerated. Therefore, NdFeB permanent magnets typically undergo surface coating treatment. Currently used coating technologies include: electroplated nickel, electroplated zinc, combined electroplated nickel-copper-nickel, electroless nickel plating, electrophoresis, and vacuum sputtering of aluminum films. However, the surface coatings obtained using these methods cannot fully meet the corrosion resistance and performance requirements of NdFeB permanent magnets, limiting their application in marine environments and other fields with higher demands for corrosion resistance and stability.

[0003] The content of the background section is merely the technology known to the inventor and does not necessarily represent the prior art in this field. Utility Model Content

[0004] To improve the corrosion resistance of NdFeB magnets, this application provides a NdFeB magnet comprising:

[0005] The magnet body;

[0006] A nickel layer is applied to the surface of the magnet body.

[0007] A copper layer, covering the surface of the nickel layer; and

[0008] A nickel-phosphorus layer is coated on the surface of the copper layer;

[0009] The thickness of the copper layer is 10 to 20 micrometers.

[0010] In some embodiments of this application, the thickness of the copper layer is 15 to 20 micrometers.

[0011] In some embodiments of this application, the thickness of the nickel layer is 5 to 10 micrometers.

[0012] In some embodiments of this application, the thickness of the nickel-phosphorus layer is 5 to 10 micrometers.

[0013] In some embodiments of this application, the neodymium iron boron magnet is in the shape of a square sheet, a circular sheet, a tile, or a ring.

[0014] In some embodiments of this application, the neodymium iron boron magnet is in the form of a semi-circular sheet.

[0015] In some embodiments of this application, the neodymium iron boron magnet is a sintered neodymium iron boron magnet or a bonded neodymium iron boron magnet.

[0016] In some embodiments of this application, the phosphorus content in the nickel-phosphorus layer is 12-15 wt%.

[0017] This application also provides an electric motor, including any of the neodymium iron boron magnets described above.

[0018] This application further provides a fishing tackle including the aforementioned motor.

[0019] This application improves the density of the coating by using a composite design of nickel, copper and nickel-phosphorus layers. In addition, the intermediate copper layer of this application is relatively thick, so it can effectively improve the corrosion resistance of neodymium iron boron magnets with only three coatings.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of a neodymium iron boron magnet provided in one embodiment of this application is shown. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0023] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0024] In this utility model, the terms "first," "second," and other ordinal numbers are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0025] It should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a flexible connection, a detachable connection, or an integral connection, and also include situations where two parts are in contact with each other; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this disclosure can be understood according to the specific circumstances.

[0026] The specific embodiments of this utility model will be described in more detail below with reference to the accompanying drawings and examples, so as to better understand the solution of this utility model and its advantages in various aspects. However, the specific embodiments and examples described below are for illustrative purposes only and are not intended to limit this utility model.

[0027] Figure 1 A neodymium iron boron magnet 10 according to an embodiment of this application is shown. The magnet is a sintered neodymium iron boron magnet; in other embodiments of this application, it may also be a bonded neodymium iron boron magnet.

[0028] like Figure 1 As shown, the neodymium iron boron magnet 10 includes a magnet body 11, a nickel layer 12, a copper layer 13, and a nickel-phosphorus layer 14. The nickel layer 12 covers the surface of the magnet body 11. The copper layer 13 covers the surface of the nickel layer 12, and the nickel-phosphorus layer 14 covers the surface of the copper layer.

[0029] In the preparation process, a magnet body 11 can be prepared first, then a nickel layer 12 can be electroplated on the surface of the magnet body 11, followed by a copper layer 13 electroplated on the surface of the nickel layer 12, and finally a nickel-phosphorus layer 14 can be electrolessly plated on the surface of the copper layer. Optionally, in this application, the phosphorus content in the nickel-phosphorus layer is 12-15 wt%. In some specific embodiments of this application, the phosphorus content in the nickel-phosphorus layer can be 12 wt%, 13 wt%, 14 wt%, or 15 wt%. The specific methods are well known in the art and will not be described in detail here.

[0030] This application improves the density of the coating through a composite design of nickel, copper, and nickel-phosphorus layers. Furthermore, the thickness of the intermediate copper layer 13 is relatively thick, ranging from 10 to 20 micrometers, thus effectively improving the corrosion resistance of the NdFeB magnet even with only three coating layers. Optionally, the thickness of the copper layer 13 is 15 to 20 micrometers. In some specific embodiments of this application, the thickness of the copper layer 13 can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 micrometers.

[0031] Optionally, the thickness of the nickel layer 12 is 5 to 10 micrometers. Optionally, the thickness of the nickel-phosphorus layer 14 is 5 to 10 micrometers. In some specific embodiments of this application, the thickness of the nickel layer 12 may be 5 micrometers, 6 micrometers, 7 micrometers, 8 micrometers, 9 micrometers, or 10 micrometers. In some specific embodiments of this application, the thickness of the nickel-phosphorus layer 14 may be 5 micrometers, 6 micrometers, 7 micrometers, 8 micrometers, 9 micrometers, or 10 micrometers.

[0032] In this embodiment, the neodymium iron boron magnet 10 has a cuboid structure. In other embodiments of this application, the neodymium iron boron magnet 10 may also have a semi-circular sheet, a circular sheet, a square sheet, a tile shape, a ring shape, or other structures.

[0033] This application also provides a motor including any of the neodymium iron boron magnets described above. This application further provides a fishing tackle including the aforementioned motor. Due to the inclusion of the aforementioned neodymium iron boron magnets, the motor and fishing tackle provided by this application exhibit superior performance.

[0034] Example

[0035] This embodiment prepares a sintered NdFeB magnet including a coating, and the steps are as follows:

[0036] On a rectangular sintered NdFeB magnet body measuring 50×40×30 cm, a nickel layer of approximately 7 micrometers was first electroplated, followed by a copper layer of approximately 12 micrometers, and finally a nickel-phosphorus layer of approximately 6 micrometers was electrolessly plated. The phosphorus content in the nickel-phosphorus plating solution used was approximately 18.8 wt%.

[0037] The sintered NdFeB magnets, including the coating, were tested under neutral salt spray conditions (NaCl 50 g / L, 35 °C) for 480 hours, and no corrosion spots were observed. This demonstrates that the NdFeB magnets provided in this application exhibit excellent corrosion resistance.

[0038] Energy dispersive spectroscopy analysis was performed on the sintered NdFeB magnet including the coating, and the phosphorus content on its surface was found to be approximately 14.1 wt%.

[0039] Comparative Example

[0040] The difference between this comparative example and the embodiment is that the thickness of the electroplated copper layer is approximately 6 micrometers.

[0041] The prepared sintered NdFeB magnets, including the coating, were subjected to a neutral salt spray test (NaCl 50 g / L, 35 °C) for 480 hours, and corrosion pits appeared on the surface. Energy dispersive spectroscopy (EDS) analysis of the prepared sintered NdFeB magnets, including the coating, revealed a surface phosphorus content of approximately 13.9 wt%.

[0042] Obviously, the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A neodymium iron boron magnet, characterized in that, It consists of the following structure: The magnet body; A nickel layer is applied to the surface of the magnet body. A copper layer, covering the surface of the nickel layer; and A nickel-phosphorus layer is formed on the surface of the copper layer; The copper layer has a thickness of 16-20 micrometers, the nickel layer has a thickness of 5-10 micrometers, the nickel-phosphorus layer has a thickness of 5-10 micrometers, and the phosphorus content in the nickel-phosphorus layer is 12-15 wt%.

2. The neodymium iron boron magnet according to claim 1, characterized in that, The neodymium iron boron magnet is in the form of a square plate, a round plate, a tile, or a ring.

3. The neodymium iron boron magnet according to claim 1, characterized in that, The neodymium iron boron magnet is in the shape of a semi-circular sheet.

4. The neodymium iron boron magnet according to claim 1, characterized in that, The neodymium iron boron magnet is a sintered neodymium iron boron magnet or a bonded neodymium iron boron magnet.

5. An electric motor, characterized in that, Includes the neodymium iron boron magnet as described in any one of claims 1 to 4.

6. A fishing tackle, characterized in that, Includes the motor described in claim 5.

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