Screw and electrical equipment

Abstract

The invention provides a screw and electrical equipment. According to the screw, the main body is sequentially covered with the protective layer, the first anti-corrosion layer, the second anti-corrosion layer and the third anti-corrosion layer so that the anti-corrosion capacity of the screw can be improved, the anti-corrosion performance of the first anti-corrosion layer, the anti-corrosion performance of the second anti-corrosion layer and the anti-corrosion performance of the third anti-corrosion layer are gradually enhanced in a stepped mode, and the anti-corrosion capacity of the screw is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of hardware components, and in particular to a screw and an electrical device. Background Art

[0002] Screws are a commonly used hardware accessory that needs to have good corrosion resistance. Traditional screws are usually made of nickel-plated steel, which has a general anti-corrosion effect. When screws are used in an environment with high corrosion intensity, they are easily corroded, resulting in reduced performance of the screws themselves, or even damage and failure. Summary of the invention

[0003] In view of this, the present application provides a screw and an electrical device to improve the problem of poor corrosion resistance of the screw.

[0004] The technical solution adopted by this application to solve the above technical problems is:

[0005] In a first aspect, an embodiment of the present application provides a screw, comprising:

[0006] main body;

[0007] A protective layer covering the surface of the main body;

[0008] A first anti-corrosion layer, covering a surface of the protective layer away from the main body;

[0009] a second anti-corrosion layer, covering a surface of the first anti-corrosion layer away from the main body;

[0010] a third anti-corrosion layer, covering a surface of the second anti-corrosion layer away from the main body;

[0011] Among them, the third anti-corrosion layer is a multi-metal alloy mixed layer, the graphene content percentage in the first anti-corrosion layer ranges from 1% to 5%; the graphene content percentage in the second anti-corrosion layer ranges from 1% to 5%; the graphene content percentage in the third anti-corrosion layer ranges from 1% to 5%.

[0012] Optionally, the third anti-corrosion layer is a mixed layer of copper-tin alloy and graphene.

[0013] Optionally, the third anti-corrosion layer is a mixed layer of nickel-cobalt alloy and graphene.

[0014] Optionally, the thickness of the third anti-corrosion layer ranges from 0.5 to 4 um.

[0015] Optionally, the first anti-corrosion layer is a mixed layer of nickel and graphene.

[0016] Optionally, the second anti-corrosion layer is a mixed layer of copper and graphene.

[0017] Optionally, the thickness of the second anti-corrosion layer ranges from 0.5 to 3 um.

[0018] Optionally, the graphene content in the first anti-corrosion layer is less than the graphene content in the second anti-corrosion layer, and the graphene content in the second anti-corrosion layer is less than the graphene content in the third anti-corrosion layer.

[0019] Optionally, the graphene content in the first anti-corrosion layer is less than the graphene content in the second anti-corrosion layer, and the graphene content in the second anti-corrosion layer is less than the graphene content in the third anti-corrosion layer.

[0020] Optionally, the protective layer is a copper layer, and the thickness of the protective layer ranges from 0.5 to 2 um.

[0021] In a second aspect, the present application provides an electrical device, comprising the screw as described in the first aspect.

[0022] In summary, due to the adoption of the above technical solution, this application has at least the following beneficial effects:

[0023] An embodiment of the present application provides a screw and an electrical device, which improves the corrosion resistance of the screw by sequentially covering a protective layer, a first anti-corrosion layer, a second anti-corrosion layer and a third anti-corrosion layer on the main body, and the first anti-corrosion layer, the second anti-corrosion layer and the third anti-corrosion layer are all doped with graphene, and the percentage range of graphene content is set to 1% to 5%, thereby further improving the corrosion resistance of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a screw provided in an embodiment of the present application;

[0025] Figure 2 A schematic cross-sectional view of a screw provided in an embodiment of the present application.

[0026] Description of reference numerals:

[0027] 1. Main body; 2. Protective layer; 3. First anti-corrosion layer; 4. Second anti-corrosion layer; 5. Third anti-corrosion layer. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0029] In the description of this application, it should be understood that the words "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In this application, the word “exemplary” is used to mean “serving as an example, instance, or illustration.” Any embodiment described in this application as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0031] See also Figure 1 and Figure 2 An embodiment of the present application provides a screw, comprising a main body 1, a protective layer 2, a first anti-corrosion layer 3, a second anti-corrosion layer 4 and a third anti-corrosion layer 5.

[0032] Among them, the main body 1 is in the shape of a screw and is made of iron or steel to ensure the overall rigidity of the screw. The protective layer 2 covers the surface of the main body 1 to protect the main body 1 from corrosion and to protect the subsequent plating from affecting the surface of the main body 1, which is convenient for subsequent plating. In this embodiment, the protective layer 2 is made of metallic copper, that is, a layer of copper material is electroplated on the surface of the main body 1 to form a copper layer, so that the protective layer 2 can play a good conductive role while protecting the main body 1. The thickness of the protective layer 2 ranges from 0.5 to 2um, which can not only play a protective and conductive role, but also not be too thick to cause material waste. In addition, the protective layer 2 is electroplated on the surface of the main body 1, so that when the first anti-corrosion layer 3 is electroplated later, the main body 1 can be prevented from reacting with the electroplating solution, which is convenient for the electroplating of the first anti-corrosion layer 3. The first anti-corrosion layer 3 covers the surface of the protective layer 2 away from the main body 1, further increasing the difficulty of the surface of the main body 1 directly contacting the outside world, and forming anti-corrosion protection for both the protective layer 2 and the main body 1. The second anti-corrosion layer 4 covers the surface of the first anti-corrosion layer 3 away from the main body 1, further increasing the difficulty of direct contact between the surface of the main body 1 and the outside world, and forming anti-corrosion protection for the protective layer 2, the main body 1 and the first anti-corrosion layer 3. The third anti-corrosion layer 5 covers the surface of the second anti-corrosion layer 4 away from the main body 1, further increasing the difficulty of direct contact between the surface of the main body 1 and the outside world, and forming anti-corrosion protection for the main body 1, the protective layer 2, the first anti-corrosion layer 3 and the second anti-corrosion layer 4, and the third anti-corrosion layer 5 is a multi-metal alloy mixed layer, which is conducive to improving the anti-corrosion ability and self-strength of the third anti-corrosion layer 5 itself.

[0033] Furthermore, the anti-corrosion performance of the first anti-corrosion layer 3 is lower than the anti-corrosion performance of the second anti-corrosion layer 4 , and the anti-corrosion performance of the second anti-corrosion layer 4 is lower than the anti-corrosion performance of the third anti-corrosion layer 5 .

[0034] The technical solution provided in the present application is to sequentially cover the protective layer 2, the first anti-corrosion layer 3, the second anti-corrosion layer 4 and the third anti-corrosion layer 5 on the main body 1 to improve the anti-corrosion ability of the screw, and the anti-corrosion performance of the first anti-corrosion layer 3, the second anti-corrosion layer 4 and the third anti-corrosion layer 5 is a gradually enhanced step-by-step arrangement, which further improves the anti-corrosion ability of the screw. In detail, firstly, by covering the surface of the main body 1 with a multi-layer structure, specifically including the protective layer 2, the first anti-corrosion layer 3, the second anti-corrosion layer 4 and the third anti-corrosion layer 5, each stacked structure can play an anti-corrosion role, thereby achieving the improvement of the anti-corrosion ability of the screw. Then, by gradually enhancing the anti-corrosion performance of the first anti-corrosion layer 3, the second anti-corrosion layer 4 and the third anti-corrosion layer 5 along the stacking direction from the inside to the outside, the overall anti-corrosion performance of the screw is further improved, so that the screw meets the requirements of working in a highly corrosive environment.

[0035] In some embodiments, the first anti-corrosion layer 3, the second anti-corrosion layer 4, and the third anti-corrosion layer 5 all contain graphene. The graphene content in the first anti-corrosion layer is less than the graphene content in the second anti-corrosion layer, and the graphene content in the second anti-corrosion layer is less than the graphene content in the third anti-corrosion layer. Based on the strong corrosion resistance and good electrical conductivity of graphene, graphene is provided in the first anti-corrosion layer 3, the second anti-corrosion layer 4, and the third anti-corrosion layer 5, which is beneficial to improve the corrosion resistance of the coating while minimizing the reduction of the electrical conductivity of the anti-corrosion layer. Furthermore, by gradually increasing the graphene content in the first anti-corrosion layer 3, the second anti-corrosion layer 4, and the third anti-corrosion layer 5 arranged from the inside to the outside, the corrosion resistance of the three anti-corrosion layers after stacking is enhanced in a step-by-step manner from the inside to the outside.

[0036] Furthermore, the percentage of graphene content in the first anti-corrosion layer 3 is in the range of 1% to 5%. The percentage of graphene content in the second anti-corrosion layer 3 is in the range of 1% to 5%. The percentage of graphene content in the third anti-corrosion layer 3 is in the range of 1% to 5%. The content of graphene in the three anti-corrosion layers is limited to the range of 1% to 5%, so that the three anti-corrosion layers can play an anti-corrosion role while not interfering too much with the conductivity of the three anti-corrosion layers, ensuring that the screws can play a conductive role while tightening. It should be noted that although the graphene content in the three anti-corrosion layers is in the range of 1% to 5%, the graphene content in the first anti-corrosion layer 3 is less than the graphene content in the second anti-corrosion layer 4, and the graphene content in the second anti-corrosion layer 4 is less than the graphene content in the third anti-corrosion layer 5.

[0037] In some embodiments, the third anti-corrosion layer 5 is a mixed layer of copper-tin alloy and graphene, that is, the copper-tin alloy layer is mixed with the third graphene layer. In other words, the third anti-corrosion layer 5 contains copper-tin alloy material and graphene material, and the copper-tin alloy material and the graphene material are mixed together, and the copper-tin alloy and the graphene are in a mixed state. The third anti-corrosion layer 5 mixes copper-tin alloy and graphene materials, and utilizes the high hardness characteristics of copper-tin alloy and the strong corrosion resistance and conductivity of graphene. The high hardness characteristics of copper-tin alloy can effectively make up for the shortcomings of insufficient hardness of graphene, so that the third anti-corrosion layer 5 can have strong corrosion resistance and high hardness.

[0038] In some embodiments, the third anti-corrosion layer 5 is a mixed layer of nickel-cobalt alloy and graphene. In other words, the third anti-corrosion layer 5 contains nickel-cobalt alloy material and graphene material, and the nickel-cobalt alloy material and graphene material are mixed together. Nickel and cobalt have high corrosion resistance, especially in acidic and oxidizing environments, and can form a dense oxide film. The addition of graphene further improves the chemical stability of the third anti-corrosion layer 5 and inhibits the penetration of corrosion factors (such as water, oxygen, and chloride ions). In addition, the present embodiment replaces the copper-tin alloy with a nickel-cobalt alloy. The hardness of the nickel-cobalt alloy is much higher than that of the copper-tin alloy. Combined with the lubricating properties of graphene, the wear resistance of the coating is significantly improved. Although the conductivity of the nickel-cobalt alloy is slightly inferior to that of the copper-tin alloy, the high conductivity of graphene makes up for this shortcoming, so that the overall coating takes into account both conductivity and corrosion resistance.

[0039] In some embodiments, the thickness of the third anti-corrosion layer 5 ranges from 0.5 to 4 um. The thickness of the third anti-corrosion layer 5 directly affects its anti-corrosion performance and durability. A thinner third anti-corrosion layer 5 may not be able to completely cover the surface of the second anti-corrosion layer 4, increasing the risk of corrosion; while an overly thick third anti-corrosion layer 5 may increase production costs and processing complexity. The third anti-corrosion layer 5 with a thickness of 0.5 um ensures that it can cover the surface of the second anti-corrosion layer 4, forming a complete barrier to prevent corrosion factors from directly contacting the substrate. The third anti-corrosion layer 5 with a thickness of 4 um provides a thicker anti-corrosion layer in an environment with higher corrosion intensity, while enhancing the wear resistance and long-term protection effect of the anti-corrosion layer. And if the third anti-corrosion layer 5 is a mixed coating of copper-tin alloy and graphene, the coating has better flexibility and adhesion when the thickness is small, and is not prone to peeling or cracking, but a coating that is too thin may be easily damaged under mechanical pressure or friction. Therefore, the thickness of the third anti-corrosion layer 5 is controlled within an appropriate range so that the third anti-corrosion layer 5 has good adhesion and anti-corrosion performance, while avoiding damage due to being too thin and complex process and waste of materials due to being too thick.

[0040] In some embodiments, the first anti-corrosion layer 3 is a mixed layer of nickel and graphene. In other words, the first anti-corrosion layer 3 contains metal nickel material and graphene material, and the nickel material and graphene material are mixed together. The anti-oxidation property of nickel is combined with the chemical inertness of graphene to effectively resist corrosion by corrosive substances. Nickel provides high hardness and toughness, and graphene improves lubrication performance and reduces friction loss. In addition, the high conductivity of graphene makes up for the lack of conductivity of nickel.

[0041] In some embodiments, the third anti-corrosion layer 5 may also be a nickel-cobalt alloy material without graphene material. The anti-corrosion performance and hardness of the screw are improved by utilizing the anti-corrosion property and hardness of the nickel-cobalt alloy. In addition, the third anti-corrosion layer 5 may be directly laminated with the first anti-corrosion layer 3, eliminating the second anti-corrosion layer 4, because the nickel-cobalt alloy in the third anti-corrosion layer 5 can better combine with the nickel in the first anti-corrosion layer 3, which is conducive to improving the adhesion between the third anti-corrosion layer 5 and the first anti-corrosion layer 3.

[0042] In some embodiments, the second anti-corrosion layer 4 is a mixed layer of copper and graphene. Copper is one of the metals with the highest electrical conductivity, which can ensure that the coating has excellent electrical conductivity, so that the screws with the second anti-corrosion layer 4 can act on devices with high electrical conductivity requirements, such as electrical equipment. In addition, copper has strong corrosion resistance in neutral and weakly corrosive environments, and the chemical inertness of graphene further enhances the anti-corrosion effect. In addition, pure copper coatings may have tiny pores, and corrosive media can easily penetrate through these pores. Graphene is distributed in the coating, filling micropores to form a dense barrier. The coating exhibits excellent anti-permeability in acidic or salt-containing mist gas environments, reducing the intrusion of corrosion factors. Copper is easily oxidized under high temperature conditions to generate copper oxide. Graphene has significant high temperature resistance and can inhibit the oxidation reaction of copper. Make the second anti-corrosion layer 4 more stable in a high temperature environment, so that the screws can be suitable for high temperature working conditions.

[0043] Furthermore, the thickness of the second anti-corrosion layer 4 ranges from 0.5 to 3um. The thickness range of the second anti-corrosion layer 4 is designed to be 0.5 to 3um, which is based on the balance between performance requirements and process feasibility, and the purpose is to achieve the best effect between conductivity, corrosion resistance, cost and production process. A thinner second anti-corrosion layer 4, such as a thickness less than 0.5um, may not be able to completely cover the surface of the first anti-corrosion layer 3, and then fail to form an effective barrier. An overly thick second anti-corrosion layer 4, such as a thickness greater than 3um, may cause the adhesion of the second anti-corrosion layer 4 to decrease or crack. By limiting the thickness range of the second anti-corrosion layer 4, it can be selectively set according to the actual application environment. If the screw is used in a low-corrosion environment, the thickness of the second anti-corrosion layer 4 can be set to a thickness close to 0.5um to reduce costs while ensuring basic protection performance. If the screw is used in a high-corrosion environment, the thickness of the second anti-corrosion layer 4 can be set to a thickness close to 3um to provide stronger corrosion resistance and mechanical protection. When the screw is used in an environment with high conductivity requirements, such as when the screw is used as an electrical contact, the thickness of the second anti-corrosion layer 4 can be set to be close to 1 to 2 um, achieving a balance between conductivity and material usage cost.

[0044] In order to more intuitively reflect the advantages of the technical solution provided by the present application compared with the traditional technical solution, the comparative example and the embodiment will be compared below:

[0045] Comparative example: The main body 1 is made of iron material, and nickel alloy is electroplated on the surface of the iron material, and the thickness of the nickel alloy is 5 um.

[0046] Embodiment 1: The main body 1 is made of iron material; the protective layer 2 is made of copper material, and the thickness of the protective layer 2 is 1um; the first anti-corrosion layer 3 is made of a mixture of graphene material and nickel material, the thickness of the first anti-corrosion layer 3 is 2um, and the graphene content in the first anti-corrosion layer 3 is 1%; the second anti-corrosion layer 4 is made of a mixture of copper material and graphene material, the thickness of the second anti-corrosion layer 4 is 2um, and the graphene content in the second anti-corrosion layer 4 is 2%; the third anti-corrosion layer 5 is made of a mixture of copper-tin alloy material and graphene material, the thickness of the third anti-corrosion layer 5 is 3um, the graphene content in the third anti-corrosion layer 5 is 3.5%, and the ratio of copper material to tin material in the copper-tin alloy material ranges from 2 to 5.

[0047] Embodiment 2: The main body 1 is made of iron material; the protective layer 2 is made of copper material, and the thickness of the protective layer 2 is 1um; the first anti-corrosion layer 3 is made of a mixture of graphene material and nickel material, the thickness of the first anti-corrosion layer 3 is 2um, and the graphene content in the first anti-corrosion layer 3 is 1%; the second anti-corrosion layer 4 is made of a mixture of copper material and graphene material, the thickness of the second anti-corrosion layer 4 is 2um, and the graphene content in the second anti-corrosion layer 4 is 2%; the third anti-corrosion layer 5 is made of a mixture of copper-tin alloy material and graphene material, the thickness of the third anti-corrosion layer 5 is 2um, the graphene content in the third anti-corrosion layer 5 is 3.5%, and the ratio of copper material to tin material in the copper-tin alloy material ranges from 2 to 5.

[0048] Embodiment 3: The main body 1 is made of iron material; the protective layer 2 is made of copper material, and the thickness of the protective layer 2 is 1um; the first anti-corrosion layer 3 is made of a mixture of graphene material and nickel material, the thickness of the first anti-corrosion layer 3 is 2um, and the graphene content in the first anti-corrosion layer 3 is 3%; the third anti-corrosion layer 5 is made of nickel-cobalt alloy material, the thickness of the third anti-corrosion layer 5 is 3um, and the ratio of nickel material to cobalt material in the nickel-cobalt alloy material ranges from 2 to 5.

[0049] Embodiment 4: The main body 1 is made of iron material; the protective layer 2 is made of copper material, and the thickness of the protective layer 2 is 1um; the first anti-corrosion layer 3 is made of a mixture of graphene material and nickel material, the thickness of the first anti-corrosion layer 3 is 2um, and the graphene content in the first anti-corrosion layer 3 is 3%; the third anti-corrosion layer 5 is made of a mixture of nickel-cobalt alloy material and graphene material, the thickness of the third anti-corrosion layer 5 is 3um, the graphene content in the third anti-corrosion layer 5 is 3.5%, and the ratio of nickel material to cobalt material in the nickel-cobalt alloy material ranges from 2 to 5.

[0050] The screws in the comparative example and Examples 1 to 3 were placed in the same corrosive environment. Except for the different components and structures of the screws, the other conditions were the same. The following are the experimental results of Examples 1 to 3 and the comparative example:

[0051]

[0052]

[0053] The above experimental results show that the screws in Examples 1 and 4 have the strongest anti-corrosion ability, the screws in Examples 2 and 3 have the second best anti-corrosion ability, and the screws in the comparative example have the worst anti-corrosion ability. The screws in Example 4 have the highest hardness, the screws in Example 1 have the second best hardness, the screws in Examples 2 and 3 have a hardness close to and less than that in Examples 1 and 4, and the screws in the comparative example have the lowest hardness.

[0054] The embodiment of the present application also provides an electrical device, including the screws described in any of the above embodiments. The electrical device has the structure and beneficial effects of the screws described in the above embodiments, which will not be repeated here. The electrical device can be any device such as a circuit breaker that requires the use of screws, especially electrical devices that require the screws to play an electrical connection role.

[0055] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0056] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of the present application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of the present application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

Claims

1. A screw, characterized in that: include: main body; A protective layer covering the surface of the main body; A first anti-corrosion layer, covering a surface of the protective layer away from the main body; a second anti-corrosion layer, covering a surface of the first anti-corrosion layer away from the main body; a third anti-corrosion layer, covering a surface of the second anti-corrosion layer away from the main body; Among them, the third anti-corrosion layer is a multi-metal alloy mixed layer, the graphene content percentage in the first anti-corrosion layer ranges from 1% to 5%; the graphene content percentage in the second anti-corrosion layer ranges from 1% to 5%; the graphene content percentage in the third anti-corrosion layer ranges from 1% to 5%.

2. The screw according to claim 1, characterized in that The third anti-corrosion layer is a mixed layer of copper-tin alloy and graphene.

3. The screw according to claim 1, characterized in that The third anti-corrosion layer is a mixed layer of nickel-cobalt alloy and graphene.

4. The screw according to claim 2 or 3, characterized in that: The thickness of the third anti-corrosion layer ranges from 0.5 to 4 um.

5. The screw according to claim 1, characterized in that The first anti-corrosion layer is a mixed layer of nickel and graphene.

6. The screw according to claim 5, characterized in that The second anti-corrosion layer is a mixed layer of copper and graphene.

7. The screw according to claim 6, characterized in that The thickness of the second anti-corrosion layer ranges from 0.5 to 3 um.

8. The screw according to claim 1, characterized in that The graphene content in the first anti-corrosion layer is less than the graphene content in the second anti-corrosion layer, and the graphene content in the second anti-corrosion layer is less than the graphene content in the third anti-corrosion layer.

9. The screw according to claim 1, characterized in that The protective layer is a copper layer, and the thickness of the protective layer ranges from 0.5 to 2 um.

10. An electrical device, characterized in that: Comprising the screw according to any one of claims 1 to 9.

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