Fig. 4
GDOES composition profile of AA2024-T3 pretreated with a ZrO2 sol–gel layer deposited by dipping technology using 0.1 M solution of metal–organic precursor. The profile in A is for a sample coated with one layer of ZrO2; the profile in B is for a sample coated with three 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)