Corrosive delamination processes of CFRP‐aluminum alloy hybrid components

Abstract

This study investigates the corrosion behavior of the contact element CFRP‐aluminum under standardized corrosion conditions. Both, the corrosion of the aluminum alloy and the coupled corrosion of the carbon fiber reinforced plastic (CFRP) were examined. FE‐SEM analysis was performed to analyze the microscopic corrosive attack. While anodic corrosion was observed for the alloy especially close to the material transition, the cathodic corrosion of the CFRP led to fracture and buckling of the glass fibers and moreover to delamination between the carbon fibers and the epoxy matrix. Finally, the influence of a cathodic polarization on the transverse tensile stress resistance of the composite was tested. The observed carbon fiber/epoxy matrix debonding processes led to a significant reduction of the mechanical properties.

Inhibiting the Oxygen Reduction Reaction Kinetics on Carbon Fiber Epoxy Composites Through Diazonium Surface Modification-Impacts on the Galvanic Corrosion of Coupled Aluminum Alloys

“…Aluminum alloy corrosion can be greatly accelerated when electrically connected with a CFRP composite consisting of exposed and electrically conducting carbon fibers. [15][16][17][80][81][82][83] The corrosion damage on the TCP-coated alloy when joined with an unmodified CFRP edge (see Fig. 11C) is primarily in the form of localized trenching near the edge of the composite and in the fastener hole.…”

“…There is clearly corrosion damage underneath the CFRP composite, so crevice corrosion was also a degradation mechanism. [15][16][17]82 Moisture and dissolved oxygen intrusion under the composite may have been the pathway to the hole. At points 1-3 along the alloy corrosion trench, digital optical microscopy was used in the 3D contour plot mode to depict the alloy dissolution.…”

“…The less noble aluminum alloy will become the anode and undergo oxidation at an accelerated rate-socalled galvanic corrosion. [12][13][14][15][16][17][18][19] This type of corrosion can be catastrophic since it can reduce the mechanical strength of the aluminum alloy.…”

Effect of high‐temperature, high‐pressure, and acidic conditions on the structure and properties of high‐performance fibers

“…As cracks continue to expand, a “serrated area” will be formed on the cross‐section, which eventually leads to the overall fracture of the fiber. [ 24 ]…”

“…As cracks continue to expand, a "serrated area" will be formed on the cross-section, which eventually leads to the overall fracture of the fiber. [24] As shown in Figure 10a,b, most of the cross-sections were stepped sections. The cracks began to grow along a plane direction, and the "saw-tooth area" can be clearly observed in the direction of growth.…”