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
Projects
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.