TABLE OF CONTENTS Surface preparation or treatment is defined as one or a series of operations including cleaning, removal of loose material, and physical and/or chemical modification of a surface to which an adhesive is applied for the purpose of bonding. In plastics bonding, surface preparation is aimed at increasing the surface polarity, improving surface wettability, and creating sites for adhesive bonding. Metal surfaces are typically covered with oxide layers, rendering the surface highly polar and fit for good adhesive bonding. Surface preparation is intended to enhance the bonding strength to metal surfaces and, primarily, to improve the durability of the bond, especially when exposed to humid environments.
An adhesive is a material applied to surfaces of articles to permanently join them by a bonding process. An adhesive is a substance capable of forming bonds to each of the two or more parts comprising the final object.[1] A feature of adhesives is the relatively small quantities required relative to the weight of the final object.
An entirely satisfactory definition for adhesion has not been found. The following definition has been proposed by Wu.[2] "Adhesion refers to the state in which two dissimilar bodies are held together by intimate interfacial contact such that mechanical force or work can be transferred...
