Surface-treated metal, surface treatment method of metal and metal and resin composite body

Abstract

The invention discloses surface-treated metal, a surface treatment method of the metal and a metal and resin composite body. A hole used for filling of resin perpendicularly extends towards the interior of the metal from the surface of the metal, any position of the hole is expanded outwards or shrunk inwards, a cavity structure with the unequal hole diameter is formed, and through the cavity structure, the metal and the resin can form a better nano anchor bolt effect, and the connecting strength of the metal and resin composite body can be effectively improved; a multistage anodic oxidation method is adopted in the metal to treat the surface of the metal, the method is efficient, environment-friendly, reliable and high in repeatability, bonding force between a resin layer and a metal base material of the metal resin composite body is good, the excellent tensile shear strength is achieved, the resin source is wide, the method is suitable for industrial large-scale production, and the problem that according to an existing method, the defective percentage stays at a high level is solved.

Description

technical field [0001] The invention relates to a metal and its surface treatment method, as well as a composite body of the metal and resin after surface treatment. Background technique [0002] At present, in practical applications, it is often necessary to solve the problem of combining metal and resin. The traditional solution is to use adhesives or create a large number of rivets, undercuts, holes, etc. However, these methods have some problems: for example, the adhesive has poor acid and alkali resistance, and the composite cannot be subjected to subsequent surface treatment; The use of methods such as riveting will not only increase the process flow, but also produce a larger product size, and the bonding strength of the metal-resin composite obtained subsequently is not high. [0003] With the continuous development of technology, a new metal and resin integration method appeared later, that is, through soaking, etching and other methods, nano-scale holes are corrod...

AI Technical Summary

Problems solved by technology

The traditional solution is to use adhesives or create a large number of rivets, undercuts, holes, etc. However, these methods have some problems: for example, the adhesive has poor acid and alkali resistance, and the composite cannot be subjected to subsequent surface treatment; Using methods such as riveting will not only increase the process flow, but also produce larger products, and the bonding strength of the metal-resin composite obtained later is not high

[0003] With the continuous development of technology, a new metal and resin integration method appeared later, that is, through soaking, etching and other methods, nano-scale holes are corroded on the surface of metal (such as aluminum alloy), and finally injection molding combines resin and aluminum Alloys are combined together to obtain an aluminum-plastic integrated product with a certain tensile and shear strength. The corrosion liquid used in this corrosion technology is amines, which are toxic and volatile substances, which are not conducive to safe production and poor environmental performance. , and the validity period of the processed metal parts is short, which is not conducive to continuous production

[0004] There are also aluminum oxide holes with a diameter of 50-80nm etched on the surface of the aluminum alloy by anodic oxidation, and then combined with resin to integrate the aluminum and plastic. However, the holes on the surface of the aluminum alloy obtained by this method are single columns. The molten resin is not easy to completely enter the interior of the nanopore, the force between the resin and the oxide layer is weak, and the plastic and the metal are easy to fall off under the action of force, which reduces the bonding strength of the aluminum alloy and the resin, that is, the tensile strength poor performance

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