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Hybrid sol–gel coatings doped with transition metal ions for the protection of AA 2024-T3

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Abstract

The protective capabilities of sol–gel coatings are determined by their physical barrier properties. For an effective protection, a homogenous crack-free material is required, which prevents from attacks of corrosive species. When the coating is damaged, active corrosion protection is usually achieved by the use of inhibitors. Among the different inhibitors rare earth ions and especially cerium have shown effective inhibiting properties. Due to the complexity of the corrosion processes, a combination of inhibitors is expected to be superior to a monocomponent inhibiting. The aim of this study was to prove which other ions, used in combination with cerium, can improve the corrosion protection abilities of hybrid silica based inorganic–organic sol–gel coatings applied on aluminium alloy 2024 substrates. Mixtures of cerium nitrate with two other potential inhibitor substances were incorporated into a sol–gel matrix and their behaviour in neutral salt spray test and during EIS measurements was investigated. The Ce–P–Pr inhibitor combination (Ce3+, PO4 3−, Pr3+) has shown the best long-term corrosion protection properties at low doping levels.

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Acknowledgments

This work was realised in the context of the MULTIPROTECT project, funded within the sixth Framework Programme of the European Community (Contract No NMP3-CT-2005-011783). We thank Dr. Mesut Aslan and Dr. Marcus Koch for preparing the cross sections and taking SEM images.

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Authors and Affiliations

  1. INM—Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany

    Alexandra Wittmar, Matthias Wittmar, Alfred Ulrich, Hinka Caparrotti & Michael Veith

  2. Inorganic Chemistry, Saarland University, Campus C4 1, 66123, Saarbrücken, Germany

    Michael Veith

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  1. Alexandra Wittmar
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  2. Matthias Wittmar
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  3. Alfred Ulrich
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  4. Hinka Caparrotti
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  5. Michael Veith
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Correspondence to Michael Veith.

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Wittmar, A., Wittmar, M., Ulrich, A. et al. Hybrid sol–gel coatings doped with transition metal ions for the protection of AA 2024-T3. J Sol-Gel Sci Technol 61, 600–612 (2012). https://doi.org/10.1007/s10971-011-2666-6

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  • DOI: https://doi.org/10.1007/s10971-011-2666-6

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