Magnesium alloy conductive rubber strip, device and preparation method
By combining a mesh sleeve woven from magnesium alloy wire with rubber strips, the problem of galvanic corrosion between magnesium alloy parts is solved, achieving a balance of high conductivity, excellent adhesion, good flexibility, and corrosion resistance. This provides high electromagnetic shielding performance and wear resistance, ensuring production safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 10TH RES INST OF CETC
- Filing Date
- 2026-03-24
- Publication Date
- 2026-06-16
AI Technical Summary
Magnesium alloys are prone to galvanic corrosion when they are bonded to dissimilar metals in aerospace platform electronic equipment. Existing conductive rubber strip materials have limitations in safety and electromagnetic shielding effectiveness, especially at extremely fine diameters where it is difficult to achieve a balance of high conductivity, excellent adhesion, good flexibility, and corrosion resistance.
The tubular mesh sleeve, woven from magnesium alloy wire, is combined with non-conductive rubber strips and connected by adhesive. An anti-corrosion and conductive layer is formed on the outer surface. Electromagnetic shielding is achieved between magnesium alloy parts through magnesium alloy conductive rubber strips. The magnesium alloy cover plate and box are surface treated to avoid galvanic corrosion.
Achieving a balance of high conductivity, excellent adhesion, good flexibility, and corrosion resistance in extremely fine diameters avoids galvanic corrosion, provides high electromagnetic shielding performance and wear resistance, and ensures production safety.
Smart Images
Figure CN122227573A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of corrosion protection for magnesium alloy electronic equipment on aerospace platforms, and more specifically, to a magnesium alloy conductive rubber strip, equipment, and preparation method. Background Technology
[0002] Magnesium alloys, due to their low density, enable lightweighting of structural components for aerospace platform electronic equipment, achieving weight reductions of over 30% compared to aluminum alloys, a commonly used material for such components. However, magnesium alloys are rarely used in aerospace platform electronic equipment projects, primarily because these components involve numerous dissimilar metal connections and locations where both conductivity and electromagnetic shielding are required, making them highly susceptible to severe galvanic corrosion under the salt spray conditions of aerospace platforms. Electromagnetic shielding between the electronic equipment housing and cover is typically achieved using conductive rubber strips. These strips are made by uniformly dispersing metal powder within rubber, or by using metal wires or mesh as a reinforcing framework. Commonly used conductive metals include silver, silver-plated copper, nickel, and copper, all of which have significant potential differences from magnesium alloys, making the conductive rubber strips a prime target for galvanic corrosion. Using magnesium alloys as the conductive material for the conductive rubber strips can prevent galvanic corrosion. Currently, no literature uses magnesium alloy as the conductive material for conductive rubber strips, mainly because magnesium powder is prone to explosion when exposed to air, which cannot guarantee production safety. Using magnesium alloy wire or mesh as the reinforcing skeleton of the rubber strip results in the skeleton being covered by the rubber strip, limiting the electromagnetic shielding effect. Covering the rubber strip with magnesium alloy mesh can guarantee production safety and electromagnetic shielding effect, but achieving a strong, durable, and conductive bond between the magnesium alloy mesh and the rubber, while ensuring the flexibility and durability of the rubber strip, is very challenging, especially for aerospace platform electronic equipment where the conductive rubber strip diameter needs to be less than 2mm due to miniaturization and lightweight requirements. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a magnesium alloy conductive rubber strip, equipment and preparation method, which solves the problem of galvanic corrosion caused by the use of conductive rubber strips for electromagnetic shielding between magnesium alloy parts. It can achieve a combination of high conductivity, excellent adhesion, good flexibility and corrosion resistance in extremely fine diameters.
[0004] The objective of this invention is achieved through the following solution: A magnesium alloy conductive rubber strip, characterized in that it comprises: Core strip, the core strip comprising a non-conductive rubber strip; A tubular mesh sleeve, which covers the outer surface of the core strip, is a tubular mesh sleeve woven from magnesium alloy wire, forming a magnesium alloy mesh sleeve; The tubular mesh sleeve woven from magnesium alloy wire is connected to the core strip by an adhesive.
[0005] Furthermore, the diameter of the magnesium alloy wire is between 0.03 mm and 0.1 mm, and the mesh count of the woven mesh is between 40 and 100 meshes.
[0006] Furthermore, the surface of the magnesium alloy mesh sleeve has a surface-treated anti-corrosion and conductive layer.
[0007] Furthermore, the magnesium alloy includes corrosion-resistant magnesium.
[0008] Furthermore, the surface treatment is conductive oxidation.
[0009] Furthermore, the corrosion-resistant magnesium is corrosion-resistant magnesium NS70.
[0010] An aerospace platform magnesium alloy electronic device includes a magnesium alloy conductive rubber strip as described in any of the preceding claims, a magnesium alloy cover plate, and a magnesium alloy housing. The magnesium alloy cover plate and the magnesium alloy housing are subjected to conductive oxidation at the contact points with the magnesium alloy conductive rubber strip, and the other surfaces are subjected to micro-arc oxidation, electrophoresis, and painting. Electromagnetic shielding is achieved by connecting the magnesium alloy cover plate and the magnesium alloy housing through the magnesium alloy conductive rubber strip, thus solving the problem of galvanic corrosion at its source.
[0011] A method for preparing a magnesium alloy conductive rubber strip includes the following steps: Prepare a rubber core strip of a predetermined diameter and perform surface treatment on the magnesium alloy mesh sleeve; An adhesive layer is applied to the surface of the rubber core strip and the inner surface of the magnesium alloy mesh sleeve; The magnesium alloy mesh sleeve is placed outside the rubber core strip coated with adhesive, and then tightly bonded by molding or rolling. Finally, the adhesive is cured to form an integrated magnesium alloy conductive rubber strip.
[0012] Furthermore, the surface treatment of the magnesium alloy mesh sleeve specifically includes conductive oxidation treatment to form an anti-corrosion and conductive layer on the surface of the magnesium alloy mesh sleeve.
[0013] Further, the magnesium alloy mesh sleeve is placed outside the rubber core strip coated with adhesive, and it is tightly fitted by a mold or roller. Specifically, this includes the following sub-steps: using an expansion mold to open the magnesium alloy mesh sleeve and guide the rubber core strip through it, and then the mold shrinks to press the mesh sleeve tightly onto the core strip.
[0014] The beneficial effects of this invention include: This invention solves the problem of galvanic corrosion caused by conductive rubber strips used for electromagnetic shielding between magnesium alloy parts. It achieves a balance of high conductivity, excellent adhesion, good flexibility, and corrosion resistance even with extremely fine diameters. Furthermore, it has the following advantages: 1) High corrosion resistance: Using magnesium alloy as the conductive material for the conductive rubber strip avoids the galvanic corrosion problem caused by the use of conductive rubber strips for electromagnetic shielding between avionics electronic equipment parts, which are conductively connected to magnesium alloy parts, which are dissimilar metals.
[0015] 2) High electromagnetic shielding performance: Magnesium alloy, as the outer cladding layer, is directly exposed to the environment, forming a continuous and complete electromagnetic shielding interface, with shielding effectiveness far exceeding that of the skeleton structure.
[0016] 3) High wear resistance: The metal mesh provides strong wear-resistant protection for the internal rubber core.
[0017] 4) Good flexibility and sealing performance: The mesh sleeve woven from fine-diameter magnesium alloy wire has excellent flexibility and does not affect the overall compression and bending of the rubber strip. The internal rubber core strip provides the main sealing function.
[0018] 5) Production safety of magnesium alloy rubber strips: Magnesium wire is woven into a magnesium alloy mesh instead of magnesium powder, which avoids the production safety problems caused by the easy explosion of magnesium powder when it comes into contact with air. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram illustrating the use of the rubber strip in an aviation platform electronic device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the externally coated conductive rubber strip according to an embodiment of the present invention; In the diagram, 1-magnesium alloy mesh sleeve, 2-rubber strip, 3-magnesium alloy cover plate, 4-magnesium alloy rubber strip, 5-magnesium alloy box body. Detailed Implementation
[0021] All features disclosed in all embodiments of this specification, or steps in all methods or processes implied in the disclosure, may be combined and / or extended or replaced in any way, except for mutually exclusive features and / or steps.
[0022] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0023] As a first aspect of a specific embodiment of the present invention, a magnesium alloy conductive rubber strip is provided, comprising a core strip made of a non-conductive rubber strip, and a tubular mesh sleeve tightly covering the outer surface of the core strip and woven from magnesium alloy wires, wherein the tubular mesh sleeve woven from magnesium alloy wires is firmly bonded to the core strip by an adhesive.
[0024] In an optional embodiment, the diameter of the magnesium alloy wire is 0.03 mm to 0.1 mm, and the mesh count of the woven mesh is 40 to 100 meshes.
[0025] In an optional embodiment, the surface of the magnesium alloy mesh sleeve has a corrosion-resistant and conductive layer formed by surface treatment, and the magnesium alloy is corrosion-resistant magnesium. In a more optional embodiment, the surface treatment is conductive oxidation, and the corrosion-resistant magnesium is corrosion-resistant magnesium NS70.
[0026] In an optional embodiment, the core strip is made of silicone rubber, fluorosilicone rubber, or neoprene rubber.
[0027] As a second aspect of a specific embodiment of the present invention, a method for preparing the above-mentioned conductive rubber strip with an externally coated magnesium alloy mesh is provided, specifically including the following steps: Step (1): Prepare a rubber core strip of a predetermined diameter; Step (2) involves surface treatment of the magnesium alloy mesh sleeve to improve its corrosion resistance; Step (3): A flexible adhesive is applied to the surface of the rubber core strip and the inner surface of the magnesium alloy mesh sleeve; Step (4): Place the magnesium alloy mesh sleeve outside the rubber core strip coated with adhesive, and make it fit tightly by molding or rolling. Step (5) allows the adhesive to cure, forming an integrated conductive rubber strip.
[0028] Preferably, in step (1), the rubber core strip is prepared by an extrusion vulcanization process.
[0029] Preferably, in step (4), an expansion mold is used to open the magnesium alloy mesh sleeve and guide the rubber core strip into it. Then the mold contracts to press the mesh sleeve tightly onto the core strip.
[0030] Preferably, in step (5), curing is performed using a hot air drying tunnel or infrared irradiation.
[0031] The above-described embodiments of the present invention solve the problem of galvanic corrosion caused by the use of conductive rubber strips for electromagnetic shielding between magnesium alloy parts, and can achieve a combination of high conductivity, excellent adhesion, good flexibility and corrosion resistance in extremely fine diameters (less than 2 mm).
[0032] In other specific implementation schemes, refer to Figure 1 This invention also provides another magnesium alloy conductive rubber strip, device, and preparation method. The magnesium alloy conductive rubber strip is a conductive silicone rubber strip with an overall outer diameter of 1.6 mm and an inner diameter of 1.5 mm, externally covered with a 60-mesh tubular mesh sleeve woven from corrosion-resistant magnesium NS70 wire with a diameter of 0.05 mm. The core strip and the mesh sleeve are firmly bonded together with a layer of silicone resin-based flexible adhesive. The magnesium alloy mesh sleeve undergoes conductive oxidation treatment to ensure corrosion resistance. The preparation method specifically includes the following steps: Step S1: Silicone rubber core strips with a diameter of 1.5 mm are prepared by extrusion and continuous vulcanization.
[0033] Step S2: Conductive oxidation treatment is performed on the magnesium alloy mesh sleeve.
[0034] Step S3: Apply flexible silicone adhesive evenly to the surface of the forward-moving rubber core through a precision injection ring.
[0035] In step S4, simultaneously, the magnesium alloy mesh sleeve is moderately expanded through a conical expansion die and then merges with the glued core strip. The core strip is pulled through the expanded mesh sleeve, and as it passes through the subsequent sizing die, the mesh sleeve retracts, tightly wrapping around the core strip.
[0036] Step S5: The coated conductive rubber strip is passed through a hot air drying tunnel at 80 to 120°C to fully cure the adhesive, and finally the finished product is obtained.
[0037] The product described in this embodiment of the invention was tested. After 100,000 bending cycles, the resistance change rate was <5%, and no delamination occurred. The test results show that the solution in this embodiment of the invention achieves excellent adhesive strength.
[0038] Furthermore, as a third aspect of a specific embodiment of the present invention, the aforementioned rubber strip is applied to magnesium alloy electronic equipment on an aerospace platform, as shown in the schematic diagram below. Figure 2In this design, both the magnesium alloy cover plate 3 and the magnesium alloy housing 5 are made of corrosion-resistant magnesium NS70. The surface in contact with the magnesium alloy rubber strip 4 is treated with conductive oxidation, while the remaining surfaces are treated with micro-arc oxidation, electrophoresis, and painting. Electromagnetic shielding is achieved by connecting the magnesium alloy cover plate 3 and the magnesium alloy housing 5 through the conductive rubber strip, thus addressing galvanic corrosion at its source. The device passed the 96-hour neutral salt spray test required by GJB150A and the electromagnetic shielding test required by GJB151B's RE102 electromagnetic shielding requirements. The test results demonstrate that the above-described embodiment of the present invention achieves both corrosion resistance and high electromagnetic shielding performance at the conductive rubber strip of the magnesium alloy electronic device.
[0039] It should be noted that, within the scope of protection defined in the claims of this invention, the following embodiments can be combined and / or extended or replaced in any logical manner from the above specific embodiments, such as the disclosed technical principles, disclosed technical features or implicitly disclosed technical features.
[0040] Example 1 A magnesium alloy conductive rubber strip, comprising: Core strip, the core strip comprising a non-conductive rubber strip 2; A tubular mesh sleeve, which covers the outer surface of the core strip and is made of magnesium alloy wire, forms a magnesium alloy mesh sleeve 1. The tubular mesh sleeve woven from magnesium alloy wire is connected to the core strip by an adhesive.
[0041] Example 2 Based on Example 1, the diameter of the magnesium alloy wire is between 0.03 mm and 0.1 mm, and the mesh count of the woven mesh is between 40 and 100 meshes.
[0042] Example 3 Based on Example 1, the surface of the magnesium alloy mesh sleeve has a surface-treated anti-corrosion and conductive layer.
[0043] Example 4 Based on Example 1, the magnesium alloy includes corrosion-resistant magnesium.
[0044] Example 5 Based on Example 3, the surface treatment is conductive oxidation.
[0045] Example 6 Based on Example 4, the corrosion-resistant magnesium is corrosion-resistant magnesium NS70.
[0046] Example 7 An electronic device made of magnesium alloy for an aviation platform includes a magnesium alloy conductive rubber strip as described in any one of Examples 1 to 6, and also includes a magnesium alloy cover plate and a magnesium alloy housing. The magnesium alloy cover plate and the magnesium alloy housing are subjected to conductive oxidation at the contact points with the magnesium alloy conductive rubber strip, and the other surfaces are subjected to micro-arc oxidation, electrophoresis and painting. Electromagnetic shielding is achieved by connecting the magnesium alloy cover plate and the magnesium alloy housing through the magnesium alloy conductive rubber strip, thus solving the problem of galvanic corrosion at the source.
[0047] Example 8 A method for preparing a magnesium alloy conductive rubber strip includes the following steps: Prepare a rubber core strip of a predetermined diameter and perform surface treatment on the magnesium alloy mesh sleeve; An adhesive layer is applied to the surface of the rubber core strip and the inner surface of the magnesium alloy mesh sleeve; The magnesium alloy mesh sleeve is placed outside the rubber core strip coated with adhesive, and then tightly bonded by molding or rolling. Finally, the adhesive is cured to form an integrated magnesium alloy conductive rubber strip.
[0048] Example 9 Based on Example 8, the surface treatment of the magnesium alloy mesh sleeve specifically includes conductive oxidation treatment to form an anti-corrosion and conductive layer on the surface of the magnesium alloy mesh sleeve.
[0049] Example 10 Based on Example 8, the magnesium alloy mesh sleeve is placed outside the rubber core strip coated with adhesive, and then tightly bonded by a mold or roller. Specifically, it includes the following sub-steps: using an expansion mold to open the magnesium alloy mesh sleeve and guide the rubber core strip through it, and then the mold shrinks to press the mesh sleeve tightly onto the core strip.
[0050] The specific embodiments of the present invention are not limited to the methods described above. The above descriptions are merely preferred embodiments and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, adjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the principles and concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A magnesium alloy conductive rubber strip, characterized in that, include: Core strip, the core strip comprising a non-conductive rubber strip; A tubular mesh sleeve, which covers the outer surface of the core strip, is a tubular mesh sleeve woven from magnesium alloy wire, forming a magnesium alloy mesh sleeve; The tubular mesh sleeve woven from magnesium alloy wire is connected to the core strip by an adhesive.
2. The magnesium alloy conductive rubber strip according to claim 1, characterized in that, The diameter of the magnesium alloy wire is between 0.03 mm and 0.1 mm, and the mesh count of the woven mesh is between 40 and 100 meshes.
3. The magnesium alloy conductive rubber strip according to claim 1, characterized in that, The surface of the magnesium alloy mesh sleeve has a surface-treated anti-corrosion and conductive layer.
4. The magnesium alloy conductive rubber strip according to claim 1, characterized in that, The magnesium alloy includes corrosion-resistant magnesium.
5. The magnesium alloy conductive rubber strip according to claim 3, characterized in that, The surface is conductively oxidized.
6. The magnesium alloy conductive rubber strip according to claim 4, characterized in that, The corrosion-resistant magnesium is corrosion-resistant magnesium NS70.
7. A magnesium alloy electronic device for an aviation platform, characterized in that, The invention includes the magnesium alloy conductive rubber strip as described in any one of claims 1 to 6, and further includes a magnesium alloy cover plate and a magnesium alloy housing. The magnesium alloy cover plate and the magnesium alloy housing are subjected to conductive oxidation at the contact points with the magnesium alloy conductive rubber strip, and the other surfaces are subjected to micro-arc oxidation, electrophoresis and painting. Electromagnetic shielding is achieved by connecting the magnesium alloy cover plate and the magnesium alloy housing through the magnesium alloy conductive rubber strip, thus solving the problem of galvanic corrosion at its source.
8. A method for preparing a magnesium alloy conductive rubber strip, characterized in that, Includes the following steps: Prepare a rubber core strip of a predetermined diameter and perform surface treatment on the magnesium alloy mesh sleeve; An adhesive layer is applied to the surface of the rubber core strip and the inner surface of the magnesium alloy mesh sleeve; The magnesium alloy mesh sleeve is placed outside the rubber core strip coated with adhesive, and then tightly bonded by molding or rolling. Finally, the adhesive is cured to form an integrated magnesium alloy conductive rubber strip.
9. The method for preparing the magnesium alloy conductive rubber strip according to claim 8, characterized in that, The surface treatment of the magnesium alloy mesh sleeve specifically includes conductive oxidation treatment to form an anti-corrosion and conductive layer on the surface of the magnesium alloy mesh sleeve.
10. The method for preparing the magnesium alloy conductive rubber strip according to claim 8, characterized in that, The magnesium alloy mesh sleeve is placed outside the rubber core strip coated with adhesive, and then tightly bonded by a mold or roller. Specifically, it includes the following sub-steps: using an expansion mold to open the magnesium alloy mesh sleeve and guide the rubber core strip through it, and then the mold shrinks to press the mesh sleeve tightly onto the core strip.