abstract
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.
keywords
ACTIVE CORROSION PROTECTION; CERIUM OXIDE NANOPARTICLES; ALUMINUM-ALLOYS; ANTICORROSION COATINGS; EPOXY COATINGS; MG ALLOY; HYDROTALCITE; PERFORMANCE; AA2024-T3; ABILITY
subject category
Chemistry
authors
Carneiro, J; Caetano, AF; Kuznetsova, A; Maia, F; Salak, AN; Tedim, J; Scharnagl, N; Zheludkevich, ML; Ferreira, MGS
our authors
Alena Kuznetsova
Research Fellowship
Ana Caetano
PhD Student
Andrei Salak
Principal Researcher
Frederico Calheiros Maia
PhD Student
João Tedim
Associate Professor
Jorge Augusto Oliveira Carneiro
Post-Doc Fellowship
Mário Guerreiro Silva Ferreira
Retired Professor
Mikhail Zheludkevich
Invited Principal ResearcherGroups
G3 - Electrochemical Materials, Interfaces and Coatings
G4 - Renewable Materials and Circular Economy
Projects
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
FUNACOP - Nanomateriais para aplicação em revestimentos funcionais (FUNACOP)
acknowledgements
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.