Composite of metal and resin and method for manufacturing the same

A method for manufacturing a composite of metal and resin, comprising:

• a shaping step of shaping a titanium alloy substrate by mechanical working;
• a surface treatment step including chemical etching for providing the surface of said shaped substrate with a ultrafine textured face in which protrusions with a height, width and length of at least 10 nm rise up at a spacing period of at least 10 nm in observation with an electron microscope and which a surface roughness made up of the textured face with a maximum height of roughness of 0.5 to 5 μm at a period of 1 to 10 μm;
• an insertion step of inserting said substrate that has undergone said surface treatment including chemical etching into a metallic mold for injection molding;
• and
• an integrating step of injecting a first resin composition or a second resin composition onto said inserted substrate and integrating said substrate with said first resin composition or said second resin composition,
• said first resin composition being one in which a polyphenylene sulfide resin is the main component and a polyolefin resin is an auxiliary component, and
• said second resin composition being one in which a polybutylene terephthalate resin is the main component and a polyethylene terephthalate resin and/or a polyolefin resin is an auxiliary component.

A method for manufacturing a composite of metal and resin, comprising:

• a shaping step of shaping a titanium alloy substrate by mechanical working;
• a surface treatment step including chemical etching for providing the surface of said shaped substrate with a ultrafine textured face in which are observed both smooth dome-like shapes and dead leaf-like shapes within a surface area measuring 10 μm square and which a surface roughness with mean width of profile elements (RSm) of 1 to 10 μm and maximum height of roughness (Rz) of 1 to 5 μm in observation with a scanning probe microscope;
• an insertion step inserting said substrate that has undergone said surface treatment including chemical etching into an metallic mold for injection molding;
• and
• an integrating step of injecting a first resin composition or a second resin composition onto said inserted substrate and integrating said substrate with said first resin composition or said second resin composition,
• said first resin composition being one in which a polyphenylene sulfide resin is the main component and a polyolefin resin is an auxiliary component, and
• said second resin composition being one in which a polybutylene terephthalate resin is the main component and a polyethylene terephthalate resin and/or a polyolefin resin is an auxiliary component.

A method for manufacturing a composite of metal and resin, comprising:

• a shaping step of shaping a titanium alloy substrate by mechanical working;
• a chemical etching step of immersing said shaped substrate in an aqueous solution containing ammonium monohydrodifluoride and rinsing the same with water;
• an insertion step of inserting said chemically etched substrate into a metallic mold for injection molding;
• and
• an integration step of injecting a first resin composition or a second resin composition onto said inserted substrate and integrating said substrate with said first resin composition or said second resin composition,
• said first resin composition being one in which a polyphenylene sulfide resin is the main component and a polyolefin resin is an auxiliary component, and
• said second resin composition being one in which a polybutylene terephthalate resin is the main component and a polyethylene terephthalate resin and/or a polyolefin resin is an auxiliary component.