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Microstructural origin of time-dependent changes in alumina sol–gel-coated Inconel 718 exposed to NaCl solution

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Abstract

Inconel 718 was spin coated twice and fourfold with a sol to obtain 200- and 400-nm-thick transition alumina films on the surface. Bare and sol–gel alumina-coated Inconel 718 samples were exposed to NaCl solution to study their corrosion behavior by means of electrochemical impedance spectroscopy. In combination with scanning electron microscopy, it was shown that bare Inconel 718 is after initial passivation prone to pitting corrosion. For the coated Inconel 718 samples, an improvement in the protective effect of the coatings with time was observed. This observation is in contradiction to the results of other authors who observed degradation of alumina coatings exposed to NaCl solution with time. Transmission electron microscopy revealed a formation of (1) a compacted region at the coating surface as well as (2) a chromium-rich region at the interface between coating and alloy during the contact with a NaCl solution. The last one mainly contributes to the observed chronological sequence of electrochemical characteristics of the samples.

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Acknowledgments

We wish to thank Deutsche Forschungsgemeinschaft (DFG) for funding and Mrs. Rooch for preparing the TEM samples.

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Author notes

  1. Michael Feigl

    Present address: Fügetechnik Berlin-Brandenburg GmbH, Kupferhammerweg 14-18, 16227, Eberswalde, Germany

Authors and Affiliations

  1. BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205, Berlin, Germany

    Marianne Nofz, Christina Zietelmann, Michael Feigl, Ilona Dörfel & Romeo Saliwan Neumann

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  1. Marianne Nofz
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  2. Christina Zietelmann
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Correspondence to Marianne Nofz.

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Nofz, M., Zietelmann, C., Feigl, M. et al. Microstructural origin of time-dependent changes in alumina sol–gel-coated Inconel 718 exposed to NaCl solution. J Sol-Gel Sci Technol 75, 6–16 (2015). https://doi.org/10.1007/s10971-015-3668-6

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  • DOI: https://doi.org/10.1007/s10971-015-3668-6

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