Composite coating structure based on silver-tin alloy as matrix

Abstract

The utility model relates to the technical field of silver-tin alloy surface corrosion prevention, in particular to a composite coating structure based on silver-tin alloy as a base body. According to the technical scheme, a silver-tin alloy base material is included. The silver-tin alloy base material, the sealing layer, the nickel preplating layer, the second nickel layer, the first nickel layer, the second protective layer, the first protective layer and other structures are matched, the composite coating with the silver-tin alloy as the base body is reasonable in structural design, and the first protective layer and the second protective layer are adopted for conducting multi-layer protection on the silver-tin alloy base material. And meanwhile, the high-corrosion-resistance pre-nickel-plated layer is additionally arranged on the top of the silver-tin alloy base material, so that the problem that the silver-tin alloy base material is relatively low is effectively solved. And finally, a sealing layer, a second nickel layer and a first nickel layer which are good in corrosion resistance are arranged on the top of the nickel pre-plating layer, so that the corrosion resistance of the top of the composite plating layer is further improved, the service life of the composite plating layer is further prolonged, and the metal matrix is effectively protected for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of silver-tin alloy surface corrosion protection, in particular to a composite plating structure based on the silver-tin alloy as a matrix. Background Art

[0002] Silver-tin alloy as a matrix refers to a composite material structure in which silver-tin alloy serves as a base material or main material, and other materials are combined with it or coated on its surface in some way to form a composite material with specific properties and uses. In this composite material, silver-tin alloy usually plays the role of the main structural support and functional foundation. Silver-tin alloy has the characteristics of good electrical conductivity, thermal conductivity and corrosion resistance. Other materials may include coatings, additives, additional materials, etc., which, combined with the silver-tin alloy matrix, can improve the specific properties of the composite material, such as enhancing strength, improving wear resistance, increasing corrosion resistance, etc., so as to adapt to different use environments and needs. However, the composite coating structure based on silver-tin alloy usually involves the coating of multiple layers of different materials, which may have different chemical compositions and properties, which in turn leads to changes in the coating, thereby affecting the performance of the coating. Especially in corrosive environments, the reaction between different materials may cause local corrosion of the coating, accelerating the aging and destruction of the coating. Utility Model Content

[0003] The utility model aims to solve the problems existing in the background technology and proposes a composite plating structure based on a silver-tin alloy as a matrix.

[0004] The technical solution of the utility model: a composite plating structure based on silver-tin alloy as a matrix, including a silver-tin alloy substrate, and also including: a pre-plated nickel layer, a sealing layer, a second nickel layer and a first nickel layer arranged in sequence from bottom to top on the upper surface of the silver-tin alloy substrate, the thickness of the pre-plated nickel layer and the sealing layer is 18-22μm, the thickness of the second nickel layer is 4-8μm, and the thickness of the first nickel layer is 1-3μm.

[0005] Optionally, the pre-nickel plating layer is used to improve the adhesion between the sealing layer and the silver-tin alloy substrate.

[0006] Optionally, the sealing layer is a polycarbonate polyurethane passivation sealed chromium-free coating.

[0007] Optionally, the second nickel layer is an anodized electrolytic treatment layer.

[0008] Optionally, a second protective layer is provided on the upper surface of the first nickel layer, and the second protective layer is one of polyurethane, polyester, and polyethylene coatings.

[0009] Optionally, the thickness of the second protective layer is set to 10-20 μm.

[0010] Optionally, a first protective layer is provided on the upper surface of the second protective layer, the thickness of the first protective layer is 5-12 μm, and the first protective layer is a primer layer.

[0011] Compared with the prior art, the utility model has the following beneficial technical effects:

[0012] The utility model utilizes the coordination of structures such as a silver-tin alloy substrate, a sealing layer, a pre-plated nickel layer, a second nickel layer, a first nickel layer, a second protective layer and a first protective layer. The composite coating structure with the silver-tin alloy as the substrate is reasonably designed, and the first protective layer and the second protective layer are used to perform multi-layer protection on the silver-tin alloy substrate. At the same time, a layer of highly corrosion-resistant pre-plated nickel layer is added on the top of the silver-tin alloy substrate. And by arranging a sealing layer, a second nickel layer and a first nickel layer with good corrosion resistance on the top of the pre-plated nickel layer, not only the overall corrosion resistance of the composite coating can be improved, but also the service life of the composite coating can be improved, effectively providing long-term protection for the metal substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic structural diagram of the composite coating structure based on silver-tin alloy is given;

[0014] Figure 2 for Figure 1 Right view of .

[0015] Figure numerals: 1. first protective layer; 2. second protective layer; 3. first nickel layer; 4. second nickel layer; 5. sealing layer; 6. pre-nickel plating layer; 7. silver-tin alloy substrate. DETAILED DESCRIPTION

[0016] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0017] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0018] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] It should be noted that the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Example

[0023] like Figure 1-2As shown, the composite coating structure based on silver-tin alloy as the matrix proposed by the utility model includes a silver-tin alloy substrate 7, and also includes: a pre-plated nickel layer 6, a sealing layer 5, a second nickel layer 4 and a first nickel layer 3 arranged on the upper surface of the silver-tin alloy substrate 7 from bottom to top, and the pre-plated nickel layer 6 is used to improve the adhesion between the sealing layer 5 and the silver-tin alloy substrate 7, thereby ensuring the stability of the coating system. A second protective layer 2 is provided on the upper surface of the first nickel layer 3, and the second protective layer 2 is a plastic coating such as polyurethane, polyester, polyethylene, etc., which can provide good chemical corrosion resistance, and also has good wear resistance and weather resistance. The thickness of the second protective layer 2 is set to 10-20μm, and a number of inorganic nanoparticles are arranged in the second protective layer 2. The thickness of the pre-plated nickel layer 6 and the sealing layer 5 is 18-22μm. The upper surface of the second protective layer 2 is provided with a first protective layer 1, and the first protective layer 1 is a primer layer. The primer layer can provide anti-corrosion protection for the metal surface, prevent the metal from being corroded by corrosive substances (such as water, oxygen, chemicals, etc.) in the environment, and extend the service life of the metal. At the same time, the primer layer can also form good adhesion with the metal surface, improve the adhesion of subsequent coatings (such as intermediate coatings and topcoat layers) to the metal surface, and ensure the stability of the entire coating system. The closed layer 5 is a polycarbonate polyurethane passivation closed chromium-free coating. The polycarbonate polyurethane passivation closed chromium-free coating is a special coating technology, which is usually used for anti-corrosion treatment of metal surfaces. Compared with traditional chromate passivation treatment, the polycarbonate polyurethane passivation closed coating does not contain chromium ions, is more environmentally friendly, meets modern environmental protection requirements, and avoids harm to the environment and human body. At the same time, the matrix of the coating is usually polycarbonate polyurethane, and this polymer has good corrosion resistance, chemical stability and weather resistance, and can effectively protect the metal surface from corrosion. In addition, the coating contains a certain passivator and sealant, which can form a dense protective film on the metal surface, effectively isolate the metal from contact with the external environment, and prevent the erosion of corrosive media. Finally, this coating has good corrosion resistance and can protect the metal surface from corrosion such as chemicals, oxidation, and salt spray under various harsh environments.

[0024] The second nickel layer 4 is an anodized electrolytic treatment layer, which is a common metal surface treatment method, usually used for corrosion protection and surface performance improvement of aluminum and its alloys. This treatment method involves using an aluminum product as an anode to form a dense oxide film on its surface by electrolysis. The oxide film formed after anodizing treatment usually has high hardness and density, can effectively isolate the metal substrate from the contact with the external medium, and improves the corrosion resistance of aluminum and its alloys. At the same time, after anodizing treatment, the hardness of the aluminum surface is usually significantly improved, thereby improving the wear resistance and scratch resistance of the aluminum product. In addition, the formed oxide film can be tightly combined with the metal substrate, has good adhesion, and is not easy to peel off. The thickness of the second nickel layer 4 is 4-8μm, and the thickness of the first nickel layer 3 is 1-3μm.

[0025] In this embodiment, the composite coating structure with the silver-tin alloy as the base is reasonably designed, and the first protective layer 1 and the second protective layer 2 are used to perform multi-layer protection on the silver-tin alloy substrate 7. At the same time, a high corrosion-resistant pre-plated nickel layer 6 is added on the top of the silver-tin alloy substrate 7. And by arranging a sealing layer 5, a second nickel layer 4 and a first nickel layer 3 with good corrosion resistance on the top of the pre-plated nickel layer 6, not only the corrosion resistance of the top of the composite coating is improved, but also the service life of the composite coating is improved, which effectively protects the metal substrate for a long time.

[0026] The preferred embodiments of the utility model of the above utility model are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A composite coating structure based on a silver-tin alloy, comprising a silver-tin alloy substrate (7), characterized in that: Also includes: A pre-plated nickel layer (6), a sealing layer (5), a second nickel layer (4) and a first nickel layer (3) are sequentially arranged on the upper surface of the silver-tin alloy substrate (7) from bottom to top, wherein the thickness of the pre-plated nickel layer (6) and the sealing layer (5) is 18-22 μm, the thickness of the second nickel layer (4) is 4-8 μm, and the thickness of the first nickel layer (3) is 1-3 μm.

2. The composite coating structure based on silver-tin alloy as claimed in claim 1, characterized in that: The pre-nickel plating layer (6) is used to improve the adhesion between the sealing layer (5) and the silver-tin alloy substrate (7).

3. The composite coating structure based on silver-tin alloy as claimed in claim 1, characterized in that: The sealing layer (5) is a polycarbonate type polyurethane passivation sealing chromium-free coating.

4. The composite coating structure based on silver-tin alloy as claimed in claim 1, characterized in that: The second nickel layer (4) is an anodic oxidation electrolytic treatment layer.

5. The composite coating structure based on silver-tin alloy as claimed in claim 1, characterized in that: A second protective layer (2) is provided on the upper surface of the first nickel layer (3), and the second protective layer (2) is a coating selected from the group consisting of polyurethane, polyester and polyethylene.

6. The composite coating structure based on silver-tin alloy as claimed in claim 5, characterized in that: The thickness of the second protective layer (2) is set to 10-20 μm.

7. The composite coating structure based on silver-tin alloy as claimed in claim 6, characterized in that: A first protective layer (1) is provided on the upper surface of the second protective layer (2); the thickness of the first protective layer (1) is 5-12 μm; the first protective layer (1) is a primer layer.

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