Bonded structure and method for manufacturing the same

A method of manufacturing a bonded structure that contains a metal member and a fiber-reinforced plastic member bonded to each other with an adhesive, the method comprising:

• irradiating the metal member with laser to thereby form an amorphous structure layer on a surface layer of the metal member and form a bottomed hole layer including a plurality of bottomed holes on a surface layer of the amorphous structure layer, each of the bottomed holes having a reverse-tapered shape, wherein the reverse-tapered shape has, between an opening portion of each of the bottomed holes and a bottom portion thereof, a bulged portion having a larger inner circumference than the opening portion;
• injecting the adhesive into the bottomed holes;
• and
• placing a surface of the bottomed hole layer and a bonded surface of the fiber-reinforced plastic member so as to face toward each other with the adhesive interposed therebetween, and bonding the metal member and the fiber-reinforced plastic member together.

A bonded structure containing a first member and a second member banded to each other with a sealing member, at least one of the first member and the second member being a metal member, wherein:

• an amorphous structure layer is formed on a surface layer of the metal member;
• a bottomed hole layer including a plurality of bottomed holes is further formed on a surface layer of the amorphous structure layer;
• each of the bottomed holes has a reverse-tapered shape, wherein the reverse-tapered shape has, between an opening portion of each of the bottomed holes and a bottom portion thereof, a bulged portion having a larger inner circumference than the opening portion;
• the amorphous structure layer on the surface layer of the metal member and the bottomed hole layer including the plurality of bottomed holes on the surface layer of the amorphous structure layer are formed by irradiating the metal member with laser;
• an adhesive is injected in the bottomed holes;
• and
• a surface of the bottomed hole layer and a bonded surface of the second member face toward each other with the sealing member interposed therebetween.