abstract
Zn-Al layered double hydroxides (LDHs) intercalated with nitrate anions are suggested as chloride nanotraps for organic polymeric coatings. The addition of such nanotraps to a polymer layer drastically reduces the permeability of corrosive chloride anions through the protective coatings. In solution, Zn(2)-Al-NO3 LDHs are responsive to the concentration of chlorides and the release of nitrates is accompanied by entrapment of chlorides, with the process governed by ion-exchange equilibrium. In particular, a coating modified with LDH-NO3 was found to exhibit significantly lower permeability to chlorides when compared to both unmodified and LDH-Cl-containing coatings, which proves the applicability of LDHs in delaying coating degradation and corrosion initiation. (C) 2011 Elsevier Ltd. All rights reserved.
keywords
HYDROTALCITE-LIKE COMPOUNDS; CORROSION PROTECTION; FILIFORM CORROSION; COATED AA2024-T3; ALUMINUM-ALLOY; INHIBITOR; PIGMENTS; NANOCONTAINERS; RELEASE; ANIONS
subject category
Materials Science; Metallurgy & Metallurgical Engineering
authors
Tedim, J; Kuznetsova, A; Salak, AN; Montemor, F; Snihirova, D; Pilz, M; Zheludkevich, ML; Ferreira, MGS
our authors
Alena Kuznetsova
Research Fellowship
Andrei Salak
Principal Researcher
João Tedim
Associate Professor
Mário Guerreiro Silva Ferreira
Retired Professor
Mikhail Zheludkevich
Invited Principal Researcheracknowledgements
This work was supported by EU FP7 Project