Bonded joints, with which the number of fasteners to be used is reduced, are effective for the reduction of the weight of a composite structure. However, the challenge for bonded joints is to increase reliability, and the stabilization of surface treatment is indispensable. Therefore, we focused on atmospheric pressure plasma treatment, which can be easily automated, as a stable surface treatment. The effects of the treatment on the surface of composite materials and its adhesiveness were evaluated and its effectiveness was verified.
