Improvement of adhesive bonding of FRP by the corona and plasma discharge treatment was investigated in terms of chemical analysis of treated surface and adhesive strength of FRP joints. An XPS analysis was carried out on the treated surface. The XPS analysis showed an increase in functional groups such as carbonyl, carboxyl and hydroxyl groups. The adhesive strength of FRP joints was evaluated in terms of tensile shear strength for both treated and untreated FRP bonded with an epoxy adhesive. The experimental results showed that the corona and plasma discharge treatments were effective to increase the adhesive strength of FRP. The reason why the adhesive strength increases is deduced due to chemical bonding or interaction between functional groups of adhesive and polar groups on the surface of FRP induced by the corona and plasma treatments.
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