Fig. 28
Nyquist plots of electrochemical impedance recorded in 0.05 M NaCl solution for AA2024-T3 coated with a hybrid sol–gel coating inhibited with cerium nitrate (a) and charge transfer resistance (Rct) as a function of immersion time (b) (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)