Abstract
The localized interfacial region between an aluminium substrate and an epoxy adhesive has been extensively investigated. It has been found that a transitional region exists between the substrate surface and the bulk adhesive in which the physical and/or chemical properties of the polymer differ from those of the bulk polymer. Different surface treatments prior to bonding are observed to have little effect on the formation of the transitional region. Two types of transitional layers have been identified; one extending up to 1μm from the substrate interface, the other generally restricted to 10 nm from the substrate interface. Examination of regions immediately in front of a propagating crack indicate that the interfacial integrity of both an etched-bonded substrate and a pretreated-bonded substrate are maintained. In contrast, regions of the fracture surface behind a propagating crack show the existence of corrosion products on an etched substrate but not on a pretreated substrate.
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