Zn-Al layered double hydroxides as chloride nanotraps in active protective coatings

resumo

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.

palavras-chave

HYDROTALCITE-LIKE COMPOUNDS; CORROSION PROTECTION; FILIFORM CORROSION; COATED AA2024-T3; ALUMINUM-ALLOY; INHIBITOR; PIGMENTS; NANOCONTAINERS; RELEASE; ANIONS

categoria

Materials Science; Metallurgy & Metallurgical Engineering

autores

Tedim, J; Kuznetsova, A; Salak, AN; Montemor, F; Snihirova, D; Pilz, M; Zheludkevich, ML; Ferreira, MGS

nossos autores

agradecimentos

This work was supported by EU FP7 Project

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