Abstract
This paper shows the wet chemical formation of a mechanical interlocking structure with hook-like surface feature by etching exemplarily for a commonly used Ti (Ti3Al2.5V) and Al alloy (AlMg3) and the structural characterization of these surfaces. The mechanical properties of such metal-polymer joints are investigated by standard lap shear tests of metal-polymer-metal sandwich structures. They exhibit always cohesive failure in the polymer for the mechanical interlocking metal surfaces and adhesive failure for the grit-blasted metal surfaces. The ultimate shear strength before failure is at least tripled compared to the grit-blasted metal surfaces.
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