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

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 Zn 2+ -co...

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Bibliographic Details
Published in:RSC advances 2016-01, Vol.6 (17), p.13942-13952
Main Authors: Kuznetsov, B, Serdechnova, M, Tedim, J, Starykevich, M, Kallip, S, Oliveira, M. P, Hack, T, Nixon, S, Ferreira, M. G. S, Zheludkevich, M. L
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Language:English
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Summary: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 Zn 2+ -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. Zn-Al LDH-NO 3 was grown on TSA anodized surface of AA2024 aluminum alloy LDH-VO x was obtained from LDH-NO 3 via anionic exchange reaction The LDH-VO x layer confers remarkable active corrosion protection.
ISSN:2046-2069
2046-2069
DOI:10.1039/c5ra27286f