Adhesion Primer Properties: Microstructural Changes Induced by Ageing

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Abstract
The use of primers in adhesively bonded joints becomes more and more important in industrial process for improving the environmental strength of bonded structures. In this study we consider bonded joints comprising an aluminium alloy substrate clad with pure aluminium, an alumina layer obtained by surface treatment, a corrosion-inhibiting primer and a structural adhesive film. Observations and analyses (TEM or SEM imaging, electron diffraction, x-ray micro-analysis …) show that important microstructural changes of the metal/oxide/primer interphase are induced by ageing. The main modifications observed are: (a) appearance of crystalline areas in the primer layer near the oxide/primer interface, (b) complete disorganization of the columnar oxide morphology, (c) dissociation of the corrosion inhibitor. These phenomena are directly correlated to the strength losses of the bonded joints that are evaluated by mechanical experiments.

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