Fig. 6

GDOES composition profile of AA2024-T3 pretreated with a ZrO₂ sol–gel layer deposited employing 0.4 M solution of inorganic precursor (two layers) (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)