Metal/resin composite structure and metal member

Abstract

A metal / resin composite structure (106) is obtained by joining a metal member (103) and a resin member (105) made of a thermoplastic resin composition (P). When three arbitrary straight-line parts which are present on the surface (110) of the metal member (103) in parallel with each other and three arbitrary straight-line parts which are perpendicular to said straight-line parts, namely six straight-line parts in total, are subjected to surface roughness measurement according to JIS B0601 (corresponding international standard: ISO4287), the surface roughness values measured satisfy the requirements (1) and (2) simultaneously: (1) at least one of the straight-line parts exhibits a material ratio of the roughness profile (Rmr) of 30% or less as determined at a section level of 20% and an evaluation length of 4mm; and (2) the ten-point average roughness values (Rz) of all the straight-line parts as determined at an evaluation length of 4mm exceed 2μm.

Description

technical field [0001] The present invention relates to a metal / resin composite structure and a metal member. Background technique [0002] From the viewpoint of reducing the weight of various parts, resin is used as a substitute for metal. However, it is often difficult to replace all metal parts with resin. In such a case, it is conceivable to manufacture a new composite part by joining and integrating the metal molded body and the resin molded body. However, a metal molded body and a resin molded body can be joined and integrated with high joint strength by an industrially advantageous method and have not been put into practical use. [0003] In recent years, as a technique for joining and integrating a metal molded body and a resin molded body, it has been studied to form fine unevenness on the surface of a metal member, and to bond an engineering plastic having a polar group having an affinity with the metal member ( For example, Patent Documents 1 to 5, etc.). [0...

AI Technical Summary

Problems solved by technology

However, in the lamination method, the press method, etc., there are disadvantages in that the degree of freedom of the applicable shape is low, and the acid-modified polyolefin resin is attached to the place other than the place where the joint is desired, so that there is a problem that the parts are not flexible. The shape of the metal component cannot make effective use of the performance and appearance of the metal component

[0010] However, even if a water-based paint containing the above-mentioned resin composition is used, the adhesion of the paint film to the metal surface cannot be sufficiently satisfied.