Study on aramid short fiber reinforced CFRP/aluminum layered structure and its galvanic corrosion resistance

Abstract

In order to strengthen the bonding interface and weaken the influence of galvanic corrosion on carbon fiber/aluminum laminated composite, the aramid fiber with resin was introduced into the bonding layer of carbon fiber aluminum laminated composite structure to composite in this study. The ultimate load of carbon fiber/aluminum laminated composite reinforced by aramid fiber was studied based on the End Notched Flexure (ENF) three-point bending test and the fracture surface was analyzed and compared by Scanning Electron Microscopy (SEM) observations. Compared with the pure resin adhesive, the bearing capacity of Carbon Fiber Reinforced Polymer (CFRP)/aluminum composite structure reinforced by thin film prepared by 1 mm aramid short fiber can be increased by 9.7%. After the accelerated corrosion test, the bearing capacity of 1 mm aramid fiber film has been reduced by only 8.40% compared with the structure without corrosion treatment. However, compared with the CFRP/aluminum composite structure with pure resin adhesive layer, the ultimate bearing capacity of the specimen with aramid fiber reinforced adhesive layer is still 28.69% higher after immersion in salt solution corrosion environment. The aramid fiber reinforced carbon fiber/aluminum galvanic corrosion protection mechanism of the layered composite structure was discussed with detailed Scanning Electron Microscopy (SEM) observations and the Energy Dispersive Spectroscopy (EDS) spectrum analysis of corrosion product elements.