Study of ultrasonic treatment efficiency for a part surface in the adhesive medium in preparation for gluing

To ensure strengthened adhesive joints of parts that are widely used in mechanical engineering, preparation of surfaces to be glued plays an important role. Removing a thin oxide film of molecular thickness presents some difficulty, since it immediately forms again after removal. To prevent re-oxidation of the treated surface, the present work proposes using a method of ultrasonic treatment of the surface to which the adhesive has already been applied. It is assumed that cavitation at the boundary of the "part-adhesive" media, caused by ultrasound, will destroy the oxide film, and the adhesive itself will serve as a barrier against the interaction of the atmospheric oxygen with the treated surface. The effectiveness of ultrasonic treatment can be determined by other possible factors, such as: enhancement of the capillary effect manifested in increased speed and level of adhesive rise in capillaries, which facilitates its penetration into porous structures; enhancement of the chemical effect, consisting in acceleration of various chemical reactions; generation and transfer of heat resulted from energy losses during the propagation of ultrasonic vibrations. Ultrasound also directly affects the polymerization process. During the research, the author has used a scheme involving a contact between the plate attached to the emitter and both the part and the adhesive. The research results have shown effectiveness of ultrasonic treatment of the part surfaces directly in the adhesive medium before gluing, in particular, for aluminum parts.
EDN: TBEOHK, https://elibrary/tbeohk

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