Fig. 9

Potentiodynamic polarization curves in 0.05 M NaCl solution for AA2024-T3 coated with ZrO₂ sol–gel films deposited employing metal–organic (0.1 M) and inorganic (0.4 M) precursor solutions. The curves for chromate-conversion-coated (CCC) AA2024-T3 and for bare substrate are also reported in the figure (Reprinted from Prog Org Coatings, 72, Andreatta F, Paussa L, Lanzutti A, Rosero Navarro NC, Aparicio M, Castro Y, et al., Development and industrial scale-up of ZrO2 coatings and hybrid organic-inorganic coatings used as pre-treatments before painting aluminium alloys, 3–14, Copyright (2011), with permission from Elsevier)