resumo
In the present work, for the first time Zn-Al layered double hydroxide (LDH) nanocontainers were grown in-situ on the surface and in the pores of plasma electrolytic oxidation (PEO) layer and then loaded with a corrosion inhibitor to provide active protection. The developed LDH-based conversion process ensures partial sealing of the pores and provides an effective corrosion inhibition on demand leading to increased fault-tolerance and self-healing properties. The structure, morphology and composition of the LDH-sealed PEO coatings on 2024 aluminum alloy were investigated using SEM, TEM/FIB, XRD and GDOES. Electrochemical impedance spectroscopy and scanning vibrating electrode techniques show a remarkable increase in the corrosion resistance and fault tolerance when PEO coating is sealed with a LDH-inhibitor treatment. (C) The Author(s) 2016. Published by ECS. All rights reserved.
palavras-chave
PLASMA ELECTROLYTIC OXIDATION; LAYERED DOUBLE HYDROXIDES; ALUMINUM-ALLOY; CORROSION PROTECTION; CERAMIC COATINGS; ORGANIC COATINGS; HYDROTALCITE; INHIBITION; INTERCALATION; PARAMETERS
categoria
Electrochemistry; Materials Science
autores
Serdechnova, M; Mohedano, M; Kuznetsov, B; Mendis, CL; Starykevich, M; Karpushenkov, S; Tedim, J; Ferreira, MGS; Blawert, C; Zheludkevich, ML
nossos autores
João Tedim
Professor Auxiliar
Maksim Starykevich
Investigador Júnior
Maria Serdechnova
Bolseiro de pós-Doutoramento
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Mikhail Zheludkevich
Investigador Principal ConvidadoProjectos
MULTI-functional metallic SURFaces via active Layered Double Hydroxide treatments (MULTISURF)
agradecimentos
This work in part was financed by the European project MULTI-SURF (Marie Sklodowska-Curie grant agreement No 645676). MM acknowledges the Alexander von Humboldt Foundation, Germany, for the award of AvH research fellowship and financial assistance. The technical support of U. Burmester and V. Heitmann is gratefully acknowledged. Authors are grateful to Prof. Florian Pyczak and Uwe Lorenz for providing access to the TEM facilities at Helmholtz-Zentrum Geesthacht. This work was partially conducted within the framework of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID /CTM /50011/2013), financed by national funds through the FCT/MEC and co-financed by FEDER (PT2020 Partnership Agreement).