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Issue 17, 2016
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Sealing of tartaric sulfuric (TSA) anodized AA2024 with nanostructured LDH layers

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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.

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

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Publication details

The article was received on 20 Dec 2015, accepted on 26 Jan 2016 and first published on 28 Jan 2016


Article type: Paper
DOI: 10.1039/C5RA27286F
RSC Adv., 2016,6, 13942-13952

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

    B. Kuznetsov, M. Serdechnova, J. Tedim, M. Starykevich, S. Kallip, M. P. Oliveira, T. Hack, S. Nixon, M. G. S. Ferreira and M. L. Zheludkevich, RSC Adv., 2016, 6, 13942
    DOI: 10.1039/C5RA27286F

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