Abstract
The effects of a simulated service environment on the locus and bond failure mechanism of composite/metal adhesive bonds have been studied using a cyclic corrosion test. The effects of metal adherend, metal primer, and adhesive polymer chemistry on bond durability have been evaluated. Two adhesives were examined in this study, a two component urethane adhesive, and a two-component epoxy polyamide adhesive. For composite/composite bonds, composite fiber tear-out was the primary mode of bond failure for both adhesives. The highest retention in strength (85%), after cyclic corrosion testing, was observed with the urethane adhesive. The epoxy-polyamide adhesive showed a 62% retention in bond strength. Metal pretreatments and primers that improve corrosion resistance of painted steel were found to improve bond durability, when applied to the substrate prior to adhesive application and cure. The highest retention in bond strength after cyclic corrosion exposure was observed with bonds prepared using phosphated steel substrates primed with a conventional automotive cathodic electrocoat primer.
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