Sealing of tartaric sulfuric (TSA) anodized AA2024 with nanostructured LDH layers

authors	Kuznetsov, B; Serdechnova, M; Tedim, J; Starykevich, M; Kallip, S; Oliveira, MP; Hack, T; Nixon, S; Ferreira, MGS; Zheludkevich, ML
nationality	International
journal	RSC ADVANCES
keywords	ACTIVE CORROSION PROTECTION; DOUBLE HYDROXIDE FILM; T3 ALUMINUM-ALLOY; SOL-GEL COATINGS; ORGANIC COATINGS; BEHAVIOR; ACID; INHIBITION; NANOCONTAINERS; HYDROTALCITE
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.
publisher	ROYAL SOC CHEMISTRY
issn	2046-2069
year published	2016
volume	6
issue	17
beginning page	13942
ending page	13952
digital object identifier (doi)	10.1039/c5ra27286f
web of science category	Chemistry, Multidisciplinary
subject category	Chemistry
unique article identifier	WOS:000369639400042