RT Journal Article
T1 Hybrid sol-gel coatings applied on anodized AA2024-T3 for active corrosion protection
A1 Olmo Martínez, Rubén del
A1 Tiringer, U.
A1 Milosev, I
A1 Visser, P.
A1 Arrabal Durán, Raúl
A1 Matykina, Endzhe
AB The effect of the presence of an anodic film and hybrid sol-gel coating loaded with corrosion inhibitors was evaluated as a strategy for enhanced barrier and active corrosion protection of aluminium alloy 2024-T3. In this study, AA2024-T3 specimens were anodized in a modified sulphuric-citric acid bath (SCA) as the first layer of a corrosion protective multilayer system and subsequently protected by the application of silica-based hybrid sol-gel coatings. These coatings were doped with LiNO3 and Ce(NO3)3 as corrosion inhibitors and studied in comparison with the inhibitor-free sol-gel coating in terms of morphology, composition and corrosion protection of intact and scribed specimens. The anodized AA2024-T3 with an overlaying inhibitor-free sol-gel coating showed the highest impedance modulus during long-term immersion in 0.1 mol·L−1 NaCl aqueous solution. Active corrosion protection of scribed coated specimens was studied by exposure to a 0.5 mol·L−1 NaCl solution and evaluated by surface analytical techniques. The addition of Li- and Ce-based salts into the hybrid sol-gel formulation showed active corrosion protection compared to the inhibitor-free scribed hybrid sol-gel coating. The Ce-doped sol-gel coating showed less visual corrosion and higher active corrosion protection than the Li-containing one during the long-term immersion test in 0.5 mol·L−1 NaCl. Present findings reveal that the combination of the anodic/hybrid sol-gel layers on AA2024-T3 enhances the corrosion protective properties barrier properties of both stand-alone systems and the incorporation of Li- and Ce-based inhibitors provide active corrosion.
PB Elsevier Science
SN 0257-8972
YR 2021
FD 2021-08-15
LK https://hdl.handle.net/20.500.14352/4746
UL https://hdl.handle.net/20.500.14352/4746
LA eng
NO Unión Europea. Horizonte 2020
NO Ministerio de Ciencia e Innovación (MICINN)/FEDER
NO Comunidad de Madrid/ FEDER
DS Docta Complutense
RD 8 abr 2025