Sol-gel coatings modified with zeolite fillers for active corrosion protection of AA2024

resumo

This work presents a new approach to develop active protection coating systems. Zeolite microparticles were used as reservoirs for Ce (III). The zeolites were introduced into silica-zirconia sol-gel films, improving the barrier properties of the coating and conferring active corrosion protection to the AA2024 substrate. The corrosion process changes the pH of solution locally causing release of inhibitor that precipitates in the cathodic areas. Intermetallic inclusions seem to be sites prone to the formation of these cerium rich precipitates. The protection properties of the modified coatings were assessed using EIS. (C) 2012 Elsevier Ltd. All rights reserved.

palavras-chave

COATED ALUMINUM-ALLOY; CONVERSION COATINGS; LOCALIZED CORROSION; INHIBITORS; PIGMENTS; NANOCONTAINERS; PRETREATMENTS; PERFORMANCE; RESERVOIRS; DEPOSITION

categoria

Materials Science; Metallurgy & Metallurgical Engineering

autores

Dias, SAS; Lamaka, SV; Nogueira, CA; Diamantino, TC; Ferreira, MGS

nossos autores

agradecimentos

S.A.S. Dias acknowledges the FCT PhD Grant SFRH/BD/46586/2008. The authors thank Dr. Teresa Magalhaes for the XRD measurements (LNEG) and Prof. Filipa Ribeiro (UTL) for the help in preparation of the zeolite microparticles.

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