Electrochemical corrosion behavior of friction stir welding weld of 6082 aluminum alloy

In the ambient temperature solution of 0.2 mol/L NaHSO₃ and 0.6 mol/L NaCl, the electrochemical corrosion behavior of friction stir welding weld of 6082 aluminum alloy and parent material were investigated by static weight loss experiment (gravimetric test) and potentiodynamic polarization curve.With the rotation rate of 1 200 r/min, the traverse speed of 200 m/min and 3° tool tilt, the corrosion rate of the weld was less than that of the parent material, and the corrosion potential of the weld was more positive than that of the parent material, the corrosion current density was less than that of the parent material.SEM observation showed that a few shallow pits appeared on the surface of the weld, however, a large number of deeper pits emerged on the surface of the parent material.