Manufacturing method for composite of aluminum alloy and plastic

Abstract

The invention provides a manufacturing method for a composite of an aluminum alloy and plastic. The composite is obtained by covering the outer surface of the aluminum alloy with the plastic. The manufacturing method comprises the following steps: S1, carrying out oil-removing, dust-removing and coarse etching treatment on the surface of the aluminum alloy; step 2, immersing the aluminum alloy prepared by the step S1 into an etching solution to be finely etched to prepare an aluminum alloy with fine lines or fine holes on the surface, wherein a coating formed by an etching solution solvent covers the prepared fine lines or fine holes; S3, washing the etched aluminum alloy with water; S4, drying the aluminum alloy washed with the water; and S5, integrally molding by injecting the aluminum alloy and the plastic to obtain the composite. In the step S2, the etching solution is a mixed solution of cyclohexanone and fine gloss oil containing a nitrogen element. The etching solution is mixed with the fine gloss oil so that the fine gloss oil is attached on the surface of the aluminum alloy to form the coating when the aluminum alloy is etched; and the fine lines can be prevented from expanding and being recovered due to the self tension of the aluminum alloy, the widths and the depths of the fine lines and the fine holes are kept, and the aluminum alloy is conveniently combined with the plastic by injection molding.

Description

technical field [0001] The invention relates to the technical field of metal pretreatment in which metal and plastic are integrally formed by injection molding, in particular to a method for manufacturing a composite of aluminum alloy and plastic. Background technique [0002] Aluminum or aluminum alloy is used as the shell or components of 3C products, and the methods of connecting it with other materials include 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 bonding s...

AI Technical Summary

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 generally only reaches 0.5MPa; it is difficult to automate and is affected by the operator's proficiency; The working temperature is affected by the performance of the adhesive, and generally 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