Composite aluminum alloy plate

Abstract

The utility model provides a composite aluminum alloy plate which comprises an aluminum material layer, a carbon steel layer and a zinc coating, and the zinc coating is fixedly installed between the aluminum material layer and the carbon steel layer through an electroplating or dip plating process. By adopting the above structure, it is possible to provide a composite aluminum alloy sheet material which is economical and has excellent productivity, and in addition, it is possible to provide performance having the same or better corrosion resistance and compatibility with an induced current heating device as compared with a stainless steel-aluminum composite material using stainless steel plating; and a relatively low-temperature galvanized steel-aluminum composite sheet material having excellent coating performance even under a heating condition can also be provided.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal technology, specifically to a composite aluminum alloy sheet metal. Background Technology

[0002] Composite materials are laminated composite materials formed by bonding the surfaces of two or more metal materials. When used properly, the advantages of each metal material used in the composite material can be maximized.

[0003] Among composite materials, stainless steel-aluminum composites have advantages stemming from the unique physical properties of stainless steel and aluminum. They combine the low specific gravity and high thermal conductivity of aluminum with the excellent corrosion resistance and processing properties of stainless steel, making them widely used in fields such as manufacturing cooking containers and building materials.

[0004] For induction heating devices to heat the food portion of a kitchen container, the container material must be magnetic. In the case of a double-layered material, ferritic stainless steel is on the outside, the material in contact with the food is on the outermost layer, and an aluminum layer is on the inside. The side in direct contact with the food is coated with resin. Alternatively, in the case of a triple-layered material, ferritic stainless steel is on the outside, an aluminum layer is in the center, and the layer in direct contact with the food is generally composed of austenitic stainless steel.

[0005] However, ferritic stainless steel is prone to chronic surface defects such as wrinkling during forming, and removing these defects requires additional processes, such as grinding away tens of micrometers of thickness, which increases production costs. Furthermore, due to its low elongation (approximately 30%), fractures frequently occur during forming if the coating or forming conditions are not properly controlled, resulting in low yields. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an economical composite aluminum alloy sheet with excellent productivity.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] This application provides a composite aluminum alloy sheet, which includes an aluminum layer, a carbon steel layer, and a galvanized layer. The galvanized layer is fixedly installed between the aluminum layer and the carbon steel layer by electroplating or immersion coating processes.

[0009] Furthermore, the composite aluminum alloy sheet also includes a non-metallic coating, which is adhered to the outer surface of the aluminum layer.

[0010] Furthermore, the non-metallic coating is either a free fluorine resin coating or a ceramic coating.

[0011] Furthermore, the thickness of the carbon steel layer is 0.2 to 1.2 mm.

[0012] Furthermore, the thickness of the aluminum layer is 1.0 to 5.0 mm.

[0013] The beneficial effects of this utility model are as follows: by adopting the above structure, an economical composite aluminum alloy sheet with excellent productivity can be provided. In addition, compared with stainless steel-aluminum composite materials using stainless steel plating, it can provide the same or better corrosion resistance and compatibility with induction current heating devices. Furthermore, it can also provide a relatively low-temperature galvanized steel-aluminum composite sheet with excellent coating performance even under heating conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the composite aluminum alloy sheet structure in the embodiments of this application.

[0015] Figure 2 This is a schematic diagram of the composite aluminum alloy sheet structure (including non-metallic coating) in the embodiments of this application.

[0016] In the picture:

[0017] 10-Composite aluminum alloy sheet; 1-Carbon steel layer; 2-Zinc layer; 3-Aluminum material layer. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] See appendix Figure 1 As shown, this embodiment provides a composite aluminum alloy sheet 10, which includes an aluminum layer 3, a carbon steel layer 1, and a zinc plating layer 2.

[0020] One surface of the carbon steel layer 1 can be configured to be laminated with a zinc layer 2 using, for example, electroplating or hot-dip galvanizing, and one surface of the zinc layer 2 can be an aluminum layer 3. It can also be configured to be stacked, for example, using a cladding bonding method. This composite aluminum alloy sheet 10, by employing a composite method to combine galvanized steel with a zinc layer 2 of a certain thickness formed on one surface of the carbon steel with an aluminum layer 3, can exhibit excellent thermal conductivity. For example, when the galvanized steel-aluminum composite material is heated using an induction current heating method, the magnetic carbon steel layer 1 can generate heat in the composite material, and the generated heat can be transferred to the outside through the aluminum, which has excellent heat resistance. When a zinc layer 2 of a specific thickness formed on one side of the carbon steel layer 1 is combined with an aluminum layer 3, an aluminum-zinc composite layer is formed, exhibiting excellent bonding performance, improving the overall performance of the composite material, maximizing durability, and achieving the same or better bonding performance or durability even compared to cladding materials formed by cladding conventional aluminum-coated carbon steel. Galvanized steel-aluminum composites can be formed by laminating an aluminum layer onto one surface of galvanized steel and then rolling it, and the rolling can be carried out at mill roll temperatures ranging from 30°C to 300°C.

[0021] The galvanized steel-aluminum composite material can undergo additional heat treatment annealing at 200-250°C for 30-100 minutes. After heat treatment annealing, the joint material strength of the galvanized steel-aluminum composite material can be from 200 N / 10 mm to 1500 N / 10 mm. For example, the carbon steel layer 1 can have a thickness of 0.2 to 1.2 mm. The carbon steel can be any carbon steel commonly used in the art to which this disclosure pertains. When the thickness of the carbon steel layer 1 meets the above-mentioned numerical range, improvements in induction heating and heat transfer weight can be achieved. If the thickness of the carbon steel layer 1 is less than 0.2 mm, there is a problem of poor induction heating; if the thickness of the carbon steel layer 1 is greater than 1.2 mm, there is a problem of excessively slow heat transfer, and the weight of the cladding material increases beyond necessary. Preferably, the thickness meets the above-mentioned numerical range. For example, the thickness of the galvanized layer 2 can be from 10 μm to 80 μm. The zinc coating can be applied using methods commonly used in the art to which this disclosure pertains, such as electroplating and hot-dip galvanizing. A thin layer of zinc plating 2 is applied to one side of the carbon steel layer 1 to prevent the formation of an oxide layer on the carbon steel surface during the aluminum cladding process. This improves the adhesion and durability of the final cladding material. Regarding thickness, if the thickness of zinc plating 2 is less than 10 μm, it is difficult to form a uniform and dense coating; if the thickness of zinc plating 2 is greater than 80 μm, it is also difficult to form a uniform and dense coating.

[0022] For example, the aluminum layer 3 can have a thickness of 1.0 to 5.0 mm. The aluminum layer 3 can be made of a single aluminum metal or can be an aluminum alloy. The thickness of the aluminum layer 3 can be determined according to the application and requirements. If the thickness of the aluminum layer 3 is less than 1.0 mm, there is a problem of insufficient thermal conductivity of the final coating material. If the thickness of the aluminum layer 3 exceeds 5.0 mm, there is a problem of deterioration in adhesion when repeatedly heated and cooled; therefore, it is preferable that the thickness of the aluminum layer 3 meets the above-mentioned numerical range. For example, the other surface of the carbon steel layer 1 can be coated with a protective layer selected from a single metal, metal alloy, metal oxide, and high-hardness resin. Since the other surface of the carbon steel layer 1 may be exposed to the atmosphere and oxidized, a protective layer can be applied to prevent this. The protective layer is used to prevent corrosion of the carbon steel and can be introduced to improve the wear resistance, corrosion resistance, and appearance of the carbon steel. For example, the protective layer can be stainless steel, alumina, or alumina-titanium dioxide.

[0023] See attached document Figure 2 As shown, the surface of the aluminum layer 3 can be coated with a non-metallic coating 104. For example, the non-metallic coating 104 can be selected from fluoropolymer coatings and ceramic coatings. The coating material according to this disclosure exhibits excellent adhesion between the zinc plating layer 2 and the aluminum layer 3, allowing various coatings, particularly ceramic coatings and aluminum layers, to be formed on the surface of the aluminum layer even under relatively low temperature heating conditions. For example, when the fluoropolymer coating is formed at a temperature of 400°C or higher, the coating material according to this disclosure can have a dense coating with excellent uniformity, and the uniformity is also excellent when the ceramic coating is formed at a temperature of 400°C or higher. A coating with excellent dense structure can be formed at temperatures of 250–270°C, thus reducing manufacturing costs even when a coating is formed. See also Figure 2 A zinc-plated layer 2 is formed on one surface of a carbon steel layer 1 in contact with an aluminum layer 3, and a non-metallic coating 104 is located on the surface of the aluminum layer 3.

[0024] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A composite aluminum alloy sheet, characterized in that, The composite aluminum alloy sheet includes an aluminum layer, a carbon steel layer, and a galvanized layer. The galvanized layer is fixedly installed between the aluminum layer and the carbon steel layer by electroplating or immersion coating. The thickness of the carbon steel layer is 0.2 to 1.2 mm, and the thickness of the aluminum layer is 1.0 to 5.0 mm.

2. The composite aluminum alloy sheet according to claim 1, characterized in that, The composite aluminum alloy sheet also includes a non-metallic coating, which is adhered to the outer surface of the aluminum layer.

3. The composite aluminum alloy sheet according to claim 2, characterized in that, The non-metallic coating is either a free fluorine resin coating or a ceramic coating.

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