Resin- metal bonded body and method for producing the same

Abstract

Disclosed is a resin-metal bonded body of an aluminum metal member and a thermoplastic resin member, which has improved bonding strength and good durability. Also disclosed is a method for producing such a resin-metal bonded body. Specifically disclosed is a resin-metal bonded body which is obtained by bonding an aluminum metal member with a thermoplastic resin member. In this resin-metal bonded body, the aluminum metal member and the thermoplastic resin member are bonded together by an anodic oxide coating having a film thickness of 70-1500 nm or an anodic oxide coating having a triazine thiol in the inner and upper portions. The anodic oxide coating has an infrared absorption spectrum peak intensity ascribed to OH group at 0.0001-0.16.

1 . A resin-metal bonded body comprising an aluminum metal member and a thermoplastic resin member, wherein
 said aluminum metal member and said thermoplastic resin member are bonded together by an anodic oxide coating having a coating thickness of 70-1500 nm, and the anodic oxide coating has an infrared absorption spectrum peak intensity ascribed to an OH group at 0.0001-0.16.   
     
     
         2 . A resin-metal bonded body comprising an aluminum metal member and a thermoplastic resin member, wherein
 said aluminum metal member and said thermoplastic resin member are bonded together by an anodic oxide coating comprising triazine thiol in inner and upper portions, and having a coating thickness of 70-1500 nm, and wherein the anodic oxide coating has an infrared absorption spectrum peak intensity ascribed to an OH group at 0.0001-0.16.   
     
     
         3 . A method for producing a resin-metal bonded body, comprising:
 an anodic oxidation step of forming an anodic oxide coating having a coating thickness of 70-1500 nm on an aluminum metal member through electrolysis with a current density of 0.02 A/dm 2  or higher and less than 2.5 A/dm 2  in an acid solution at 35-90° C. using the aluminum metal member as an anode;   a water washing step of washing the aluminum metal member with water at a temperature of 5° C. or higher and less than 60° C.; and   a step of insert molding a thermoplastic resin on the aluminum metal member after the water washing step, so that said aluminum metal member and the thermoplastic resin are bonded together.   
     
     
         4 . A method for producing a resin-metal bonded body, comprising:
 an anodic oxidation step of forming an anodic oxide coating having a coating thickness of 70-1500 nm on an aluminum metal member through electrolysis with a current density of 0.02 A/dm 2  or higher and less than 2.5 A/dm 2  in an acid solution at 35-90° C. using the aluminum metal member as an anode;   an electrolytic polymerization step of providing a triazine thiol derivative with the anodic oxide coating in inner and upper portions through electrolysis in a solution containing a triazine thiol derivative using the aluminum metal member as an anode;   a water washing step of washing the aluminum metal member having triazine thiol ee with water at a temperature of 5° C. or higher and less than 60° C.; and   a step of insert molding a thermoplastic resin on the aluminum metal member having triazine thiol after the water washing step, so that said aluminum metal member and the thermoplastic resin are bonded together.   
     
     
         5 . A method for producing a resin-metal bonded body, comprising:
 a step of forming an anodic oxide coating having a coating thickness of 70-1500 nm and a triazine thiol derivative in inner and upper portions on an aluminum metal member through electrolysis with a current density of 0.02 A/dm 2  or higher and less than 2.5 A/dm 2  in an acid solution containing a triazine thiol derivative at 35-90° C. using the aluminum metal member as an anode;   a water washing step of washing the aluminum metal member having triazine thiol with water at a temperature of 5° C. or higher and less than 60° C.; and   a step of insert molding a thermoplastic resin on the aluminum metal member having triazine thiol after the water washing step, so that said aluminum metal member and the thermoplastic resin are bonded together.   
     
     
         6 . A method for producing a resin-metal bonded body, comprising:
 an anodic oxidation step of forming an anodic oxide coating having a coating thickness of 70-1500 nm on an aluminum metal member through electrolysis with a current density of 0.02 A/dm 2  or higher and less than 2.5 A/dm 2  in an acid solution at 35-90° C. using the aluminum metal member as an anode;   an immersion step of immersing the aluminum metal member in a solution containing a triazine thiol derivative so that a triazine thiol derivative is provided with the anodic oxide coating in inner and upper portions;   a water washing step of washing the aluminum metal member having triazine thiol with water at a temperature of 5° C. or higher and less than 60° C.; and   a step of insert molding a thermoplastic resin on the aluminum metal member having triazine thiol after the water washing step, so that said aluminum metal member and the thermoplastic resin are bonded together.   
     
     
         7 . A resin-metal bonded body produced by the method of  claim 3 . 
     
     
         8 . A resin-metal bonded body produced by the method of  claim 4 . 
     
     
         9 . A resin-metal bonded body produced by the method of  claim 5 . 
     
     
         10 . A resin-metal bonded body produced by the method of  claim 6 .