abstract
In this work, a functional sealing of a TSA anodic layer on AA2024 is suggested based upon the formation of inhibitor-containing Zn-Al layered double hydroxides (LDH). The LDH structures are formed in the pores of the anodic layer and on top of it as a result of hydrothermal treatment in a Zn2+-containing bath as shown by the structure, morphology and composition analysis. The resulting LDHs were loaded with a well-known corrosion inhibitor (vanadate). Electrochemical impedance spectroscopy, salt spray tests and scanning vibrating electrode techniques have shown a remarkable improvement in corrosion resistance of the LDH-modified sample in comparison with conventional hot-water sealing. The vanadate-loaded LDHs rendered a significant long-term active protection for the covered aluminum alloy substrate.
keywords
ACTIVE CORROSION PROTECTION; DOUBLE HYDROXIDE FILM; T3 ALUMINUM-ALLOY; SOL-GEL COATINGS; ORGANIC COATINGS; BEHAVIOR; ACID; INHIBITION; NANOCONTAINERS; HYDROTALCITE
subject category
Chemistry
authors
Kuznetsov, B; Serdechnova, M; Tedim, J; Starykevich, M; Kallip, S; Oliveira, MP; Hack, T; Nixon, S; Ferreira, MGS; Zheludkevich, ML
our authors
João Tedim
Associate Professor
Maksim Starykevich
Junior Researcher
Marco Pinheiro de Oliveira
Laboratory Officer
Mário Guerreiro Silva Ferreira
Retired Professor
Mikhail Zheludkevich
Invited Principal Researcher
Silvar Kallip
Assistant ResearcherProjects
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
MULTI-functional metallic SURFaces via active Layered Double Hydroxide treatments (MULTISURF)
acknowledgements
This work was developed within the scope 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 when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. This work was partially supported by MULTISURF (Marie Sklodowska-Curie grant agreement no. 645676) European project. SK and JT thank FCT for researcher grants (IF/00856/2013 and IF/00347/2013 respectively). Authors would like to thank Dr Andrei Salak for the performed XRD analysis.