Abstract: An antifouling system (20) for a structure exposed to seawater has an anode forming member (4) bonded to the seawater-exposed surface to be wetted with seawater (15) of the structure via an insulating adhesive (6). The anode forming member 4 is coated with an electrical catalyst film 3 of an electrochemically active and stable electrical catalyst. A conductive member (8) is disposed so as to be wetted with seawater (15). An external dc power supply (7) has a positive terminal (7a) connected to the anode forming member (4) and a negative terminal (7b) connected to the conductive member (8). The external DC power supply (7) is provided with a built-in automatic potential controller (7c) that controls the potential difference between the positive terminal (7a) and the negative terminal (7b) such that oxygen can be generated in seawater suppressing the generation of chlorine in seawater.

Abstract: In a connecting mechanism which connects two members, one of the two members is provided with an elastically deformable engaging portion, and the other member is provided with a contact surface which is brought into contact with the elastically deformable engaging portion, which is elastically deformed at a front end. The two members are engaged with each other by elastically deforming the elastically deformable engaging portion so that the latter comes into contact with the contact surface. The elastically deformable engaging portion and the contact surface are shaped such that the engagement force of the two members during a connecting operation is stronger than the engagement force when the connecting operation is completed.