Effect of Exfoliation Corrosion on the Mechanical Properties of Friction Stir Spot Welded 2024-T3 AA Joints

This study aims to detect the impact of preexfoliation corrosion on efficiency 2 mm thick 2024-T3 aluminum alloy friction stir spot welded (FSSW) joints. Five specimens FSSW joints, with 620 r·min−1 rotational speed and a dwell time 10 seconds, were immersed in an exfoliation solution for five different times: h, 20 30 40 50 h. The tensile shear load noncorroded joint was 3.5 kN. results showed that degradation mechanical properties increased increasing exposure time, drop reached 62% exposed h corroded solution. As AA joints exhibited nugget debonding failure mode mixed-mode tensile-shear fracture, specimens, only fracture could be seen. attributed reduction bonding area between upper lower sheets due corrosion.