Anti-corrosion structure of aluminum core signal line

Abstract

The utility model discloses an anti-corrosion structure of an aluminum core signal wire, which is infiltrated on the outer surface of a section of core wire at the end part of an aluminum wire, comprises a zinc layer, a nickel layer and a tin layer from inside to outside, is infiltrated on the periphery of the nickel layer and is made of tin or tin alloy. According to the utility model, the zinc layer is arranged, so that electrocorrosion generated when current passes through can be avoided or reduced; by arranging the nickel layer, the sealing force between the zinc layer and the tin layer can be improved; by arranging the tin layer, the friction coefficient of the surface of the core wire can be reduced, and the core wire can have better welding performance; by setting the zinc alloy with proper mass ratio as the zinc layer, the contact resistance and corrosion current after the core wire and the connecting terminal are connected and fixed can be well balanced, and the circuit has good conductivity.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and in particular to an anti-corrosion structure of an aluminum core signal line. Background Art

[0002] At present, products in various fields have a trend of lightweight and miniaturization. Due to the excellent characteristics of aluminum materials such as light weight and good processability, cables with aluminum cores have appeared in the field of cables instead of traditional copper cores. They have good flexibility and low cost, and their application scope has gradually expanded. However, it was found in the application process that since most of the terminals on the connectors connected to the cables are made of copper, which is different from the material of the aluminum core, the corrosion resistance of the connection between the two is poor. When liquid or water vapor enters the connection, electrical corrosion will occur due to the potential difference between different metals. Moreover, once electrical corrosion occurs, the resistance value of the connection will increase, and the stability of the connection will be directly affected, which will easily cause the cable to loosen. Therefore, aluminum core cables have strict requirements on their application environment, and their promotion and application are limited. Utility Model Content

[0003] In view of the problems existing in the above-mentioned prior art, the utility model provides an anti-corrosion structure of an aluminum core signal line. By providing a zinc layer, electric corrosion when current passes through can be avoided or reduced; by providing a nickel layer, the close contact between the zinc layer and the tin layer can be improved; by providing a tin layer, the friction coefficient of the core wire surface can be reduced, and the core wire can have better welding performance; by providing a zinc alloy with an appropriate mass proportion as the zinc layer, the contact resistance and corrosion current after the core wire is connected and fixed to the connecting terminal can be better balanced, and the circuit has better conductivity.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is as follows:

[0005] An anti-corrosion structure of an aluminum core signal line, wherein the inner core wire is made of aluminum or aluminum alloy; the anti-corrosion structure is infiltrated on the outer surface of a section of the core wire at the end of the aluminum wire, and comprises from the inside to the outside:

[0006] A zinc layer, which is impregnated on the periphery of the core wire and is composed of zinc and / or zinc alloy;

[0007] A nickel layer, infiltrated on the periphery of the zinc layer, and composed of nickel and / or a nickel alloy;

[0008] The tin layer is infiltrated on the periphery of the nickel layer and is composed of tin or a tin alloy.

[0009] As a further elaboration of the above technical solution:

[0010] In the above technical solution, the zinc layer includes an inner anti-corrosion layer and an outer anti-corrosion layer from the inside to the outside: the inner anti-corrosion layer is a zinc layer or a zinc alloy layer; the outer anti-corrosion layer is a zinc-tin alloy layer, in which the mass proportion of zinc is between 0.3% and 8%.

[0011] In the above technical solution, the zinc content of the zinc layer is between 0.01 mg / cm^2 and 0.3 mg / cm^2, and the alloy content is between 0.01 mg / cm^2 and 0.3 mg / cm^2.

[0012] In the above technical solution, the core wire is an aluminum wire or an aluminum alloy wire.

[0013] Compared with the prior art, the beneficial effects of the utility model are: by providing a zinc layer, electrical corrosion when current passes can be avoided or reduced; by providing a nickel layer, the close contact between the zinc layer and the tin layer can be improved; by providing a tin layer, the friction coefficient of the core wire surface can be reduced, and the core wire can have better welding performance; by providing a zinc alloy with an appropriate mass proportion as the zinc layer, the contact resistance and corrosion current after the core wire is connected and fixed to the connecting terminal can be better balanced, and the circuit has better conductive performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the structure of the aluminum wire in this embodiment;

[0015] Figure 2 Schematic diagram of the cross section of each core wire in this embodiment.

[0016] In the figure: 1, core wire; 2, aluminum wire; 3, zinc layer; 4, nickel layer; 5, tin layer. DETAILED DESCRIPTION

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0018] The embodiments described with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and cannot be understood as limiting the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "several" and "multiple" mean two or more, unless otherwise clearly and specifically defined. In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In this application, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature can include the first and second features being in direct contact, or it can include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0019] like Figure 1-2 As shown, an anti-corrosion structure of an aluminum core signal line, wherein the inner core wire 1 is made of aluminum or aluminum alloy; the anti-corrosion structure is infiltrated on the outer surface of a section of the core wire 1 at the end of the aluminum wire 2, and comprises from the inside to the outside:

[0020] The zinc layer 3 is infiltrated on the periphery of the core wire 1 and is composed of zinc and / or zinc alloy;

[0021] The nickel layer 4 is infiltrated on the periphery of the zinc layer 3 and is composed of nickel and / or a nickel alloy;

[0022] The tin layer 5 is infiltrated on the periphery of the nickel layer 4 and is composed of tin or a tin alloy.

[0023] In the corrosion-resistant structure of the present invention, the corrosion potential of zinc in the zinc layer 3 is very close to the corrosion potential of aluminum, thereby being able to avoid or reduce electrical corrosion when current passes through; the nickel layer 4 has good heat resistance and can be used as a bonding layer to improve the adhesion between the zinc layer and the tin layer 5; the tin layer 5 is relatively soft and has a low friction coefficient, and has good welding performance.

[0024] In this embodiment, the thickness of the nickel layer is between 0.25um and 2um, which can better connect the zinc layer 3 and the tin layer 5 tightly together; the thickness of the tin layer 5 is between 0.1um and 5um, which is moderate, which can not only maintain the appropriate wettability of the solder, but also has a low contact resistance, which is convenient for welding the core wire and the terminal.

[0025] Furthermore, the zinc layer 3 includes an inner anti-corrosion layer 301 and an outer anti-corrosion layer 302 from the inside to the outside: the inner anti-corrosion layer 301 is a zinc layer or a zinc alloy layer; the outer anti-corrosion layer 302 is a zinc-tin alloy layer, in which the mass proportion of zinc is between 0.3% and 8%.

[0026] It is understandable that when the outer anti-corrosion layer 302 is electro-corroded and zinc disappears, the tin therein can prevent the zinc of the inner anti-corrosion layer 301 from diffusing outward, thereby ensuring the anti-corrosion performance. After the core wire is welded to the terminal, if the tin content is too low, the zinc may be exposed, resulting in a higher contact resistance, but if the tin content is too high, the zinc will not diffuse sufficiently to the surface, resulting in a higher corrosion current value.

[0027] Furthermore, the zinc content of the zinc layer 3 is between 0.1 mg / cm^2 and 1.8 mg / cm^2, and the alloy content is between 0.01 mg / cm^2 and 0.3 mg / cm^2.

[0028] It is understandable that the content of zinc and alloying elements in the zinc alloy and the coverage area will directly affect the size of the corrosion current and contact resistance. When the alloy content is too low and the zinc content is too high, the contact resistance may increase due to excessive zinc, but when the alloy content is too high and the zinc content is too low, the corrosion current value may increase due to insufficient zinc diffusion. It has been verified that the mass proportion of zinc in the zinc layer 3 of the utility model can achieve a good balance between contact resistance and corrosion current, and has good conductivity.

[0029] During the wiring operation, the aluminum wire 1 is first peeled to expose the core wire 2, and zinc or zinc alloy is precipitated on its surface to form an inner anti-corrosion layer 301, and then tin is precipitated on its surface. The zinc in the inner anti-corrosion layer 301 will diffuse outward and combine with it to form a tin-zinc alloy layer as an outer anti-corrosion layer 302 to prevent the core wire from being electro-corroded after being damp; then a nickel layer 4 and a tin layer 5 are precipitated on its surface in turn. When the tin layer 5 is in a stable state, it can be welded to a copper or copper alloy terminal or fixedly connected in other ways.

[0030] Furthermore, the core wire is an aluminum wire or an aluminum alloy wire.

[0031] The above does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An anti-corrosion structure of an aluminum core signal line, wherein the inner core wire is made of aluminum or aluminum alloy; characterized in that: The anti-corrosion structure is infiltrated on the outer surface of a section of the core wire at the end of the aluminum wire, and includes from the inside to the outside: A zinc layer, which is impregnated on the periphery of the core wire and is composed of zinc and / or zinc alloy; A nickel layer, infiltrated on the periphery of the zinc layer, and composed of nickel and / or a nickel alloy; The tin layer is infiltrated on the periphery of the nickel layer and is composed of tin or a tin alloy.

2. The anti-corrosion structure of an aluminum core signal line according to claim 1, characterized in that: The zinc layer includes an inner anti-corrosion layer and an outer anti-corrosion layer from the inside to the outside: the inner anti-corrosion layer is a zinc layer or a zinc alloy layer; the outer anti-corrosion layer is a zinc-tin alloy layer, in which the mass proportion of zinc is between 0.3% and 8%.

3. The anti-corrosion structure of an aluminum core signal line according to claim 2, characterized in that: The zinc content of the zinc layer is between 0.01 mg / cm^2 and 0.3 mg / cm^2, and the alloy content is between 0.01 mg / cm^2 and 0.3 mg / cm^2.

4. The anti-corrosion structure of an aluminum core signal line according to claim 1, characterized in that: The core wire is an aluminum wire or an aluminum alloy wire.

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