Abstract
The anodized AA2099-T83 Al-Cu-Li alloy was post-treated in a lithium nitrate-based solution in order to improve its corrosion resistance. The microstructure and corrosion resistance of the alloy after various post-treatments were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), scanning vibrating electrode technique (SVET) and neutral salt spray test (NSST). It was found that, under the optimized pH of 10, the corrosion resistance of the anodized alloy treated at 25 °C and 90 °C could withstand 500 h and 1000 h of NSST, respectively. The improved corrosion resistance was ascribed to sealing effect of the pseudo-boehmite, boehmite and/or layered double hydroxides formed in the anodic film. Further, SVET analysis suggests that the anodized alloy after the post-treatment exhibited self-healing capacity.
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