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...