EPOXY ADHESION TO METALS.

Metal/epoxy structural adhesive bonding systems and coating systems possess the potential to provide strong metal-to-metal bonds, with a number of distinct advantages over conventional metal joining techniques, and to successfully protect metals from damaging environments, respectively. Exceptional strength of adhesion can be achieved by these systems under dry conditions. However, because metal polymer adhesion systems generally exhibit a great reduction in strength in the presence of moisture, their use has been severely limited. This paper reviews the major factors which influence the adhesion of epoxy resins to metals. Emphasis is placed on discussing the mechanisms by which water can decrease the strength of these systems along with the possible methods that can be employed to improve their durability in moist or wet environments.