Composite body of aluminum or aluminum alloy and plastic and manufacturing method thereof

Abstract

The invention provides a composite body of aluminum or aluminum alloy and plastic and a manufacturing method thereof. The composite body includes an aluminum or aluminum alloy substrate and a plastic part that is bonded to the surface of the substrate by injection molding. An anodized film is formed on the surface of the substrate. The anodized film is formed with several nanopores, and the average pore diameter of the several nanopores is 30-60nm, the material of the plastic part is crystalline thermoplastic. The manufacturing method of the above-mentioned composite body comprises the steps of: providing an aluminum or aluminum alloy substrate; chemically etching the substrate to make the surface of the substrate rough; anodizing the above-mentioned substrate so that the surface of the substrate is formed with an average pore diameter of 30- 60nm anodic oxide film; the substrate after the anodic oxidation treatment is placed in an injection molding mold, and the injection molded part is combined with the surface of the substrate to obtain the composite, and the material of the plastic part is a crystalline thermoplastic .

Description

technical field [0001] The invention relates to a composite of aluminum or aluminum alloy and plastic and a manufacturing method thereof, in particular to a composite of aluminum or aluminum alloy and plastic with strong binding force and a manufacturing method of the composite. Background technique [0002] As the shell or components of 3C products, aluminum or aluminum alloy can be connected with other materials by welding, mechanical connection and bonding. Among them, welding is the most important connection method for aluminum or aluminum alloy. But when aluminum or aluminum alloy is connected with plastic parts, it is necessary to use the bonding method. The bonding method refers to a method of combining aluminum or aluminum alloy with plastic parts by using adhesive as an intermediate interface material. [0003] Although the bonding method can realize the connection between aluminum or aluminum alloy and plastic parts, it has the following disadvantages: the bondin...

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Problems solved by technology

[0003] Although the bonding method can realize the connection between aluminum or aluminum alloy and plastic parts, it has the following disadvantages: the bonding strength is not high enough, and its bonding force is generally only up to 0.5MPa; it is difficult to automate and is affected by the proficiency of the operator; The working temperature is affected by the performance of the adhesive, and generally it can only work normally within the temperature range of -50-100°C; under ambient light, heat, humidity and other factors, the adhesive will cause aging and fracture; most adhesives are toxic, and the operation process It emits irritating gas, which is harmful to human health

However, the aluminum or aluminum alloy after the above-mentioned pore-forming treatment can only have a strong binding force with a single type of resin, and requires special modification of the plastic combined with it, thus limiting the application of the above method

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