Abstract
Adhesive failure is considered a key issue of bond-riveted structures exposed to chlorides. In addition, existence of carbon fiber makes the galvanic corrosion at rivet joints in AA5083/Cf/Epoxy laminates accelerated. In this study, polyaniline (PANI) modified epoxy adhesive was creatively utilized for protective purposes, and the properties of both Epoxy and Epoxy/PANI coated aluminium alloys were studied by electrochemical impedance spectroscopy (EIS) in 3.5 wt% NaCl solution. The polarization current densities between both adhesives at increasing immersion times and Carbon Fiber Reinforced Plastics (CFRP) were analyzed by zero resistance ammeter (ZRA) testing. Single-lap shear experiments were carried out to evaluate the evolution of mechanical performances at the joints between adhesives. The electrochemical results suggested that addition of polyaniline improved the adhesive resistance by roughly an order of magnitude and retarded the corrosion process. Moreover, the current density of Epoxy/PANI adhesive and CFRP reduced as immersion time extended. The mechanical properties testing identified the Epoxy/PANI adhesive with lower sensitivity towards degradation in salt-spray environment than the Epoxy adhesive. Furthermore, strength failure (−2.5% of maximum load) did not obviously appear in rivets surrounded by the Epoxy/PANI adhesive. Overall, these data are promising for future design of this joint.
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