Fig. 20

Procedures followed for production of ZrO₂ pretreatment on AA2024 (a) and for introduction of corrosion inhibitor (cerium nitrate) in multilayer sol–gel coatings deposited using a solution of metal–organic (b) and inorganic precursor (c) (Reprinted from Prog Org Coatings, 69, Andreatta F, Paussa L, Aldighieri P, Lanzutti A, Raps D, Fedrizzi L, Corrosion behaviour of sol-gel treated and painted AA2024 aluminium alloy, 133–142, Copyright (2010a), with permission from Elsevier)