resumo
In this work, nanocontainers based on layered double hydroxide (LDH) loaded with two different corrosion inhibitors, namely 2-mercaptobenzothiazole (MBT) and cerium(III) nitrate, were prepared. MBT was intercalated into LDH galleries in anionic form by anion-exchange, while Ce3+ was fixed between polyelectrolyte layers on the surface of LDH-MBT nanoplatelets by the Layer-by-Layer (LbL) method. Both inhibitors were found in the modified LDHs (LDH-Mod) by X-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy. The release studies performed by UV-vis spectrophotometry indicated that the main triggering conditions for release of MBT from LDHs changed when LDH nanoplatelets were covered with polyelectrolytes. Furthermore, electrochemical impedance spectroscopy and DC polarization were used to investigate the effect in combining MBT- and Ce3+ within the same nanocontainer, for the corrosion protection of 2024-T3 aluminium alloy directly in solution as well as in a hybrid sol-gel coating. The obtained results open prospects for application of these systems as additives in multifunctional smart coatings.
palavras-chave
ACTIVE CORROSION PROTECTION; CERIUM OXIDE NANOPARTICLES; ALUMINUM-ALLOYS; ANTICORROSION COATINGS; EPOXY COATINGS; MG ALLOY; HYDROTALCITE; PERFORMANCE; AA2024-T3; ABILITY
categoria
Chemistry
autores
Carneiro, J; Caetano, AF; Kuznetsova, A; Maia, F; Salak, AN; Tedim, J; Scharnagl, N; Zheludkevich, ML; Ferreira, MGS
nossos autores
Alena Kuznetsova
Bolseiro de investigação
Ana Caetano
Estudante de doutoramento
Andrei Salak
Investigador Principal
Frederico Calheiros Maia
Estudante de doutoramento
João Tedim
Professor associado
Jorge Augusto Oliveira Carneiro
Bolseiro de pós-Doutoramento
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Mikhail Zheludkevich
Investigador Principal ConvidadoGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G4 - Materiais Renováveis e Economia Circular
Projectos
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
FUNACOP - Nanomateriais para aplicação em revestimentos funcionais (FUNACOP)
agradecimentos
This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. This work is also funded by ERDF Funds through Operational Competitiveness Programme - COMPETE in the frame of the project FUNACOP - FCOMP-01-0124-FEDER-38777. JT thanks FCT for researcher grant IF/00347/2013. The authors thank Dr Kiryl Yasakau for the support on the synthesis of sol-gel coatings.