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The Study of the Corrosion Damage Influence on the Impedance of Anodic Oxide Coatings

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Abstract—

Changes in impedance spectra of hot-water sealed and unsealed coatings at the aluminum alloy from the Al–Cu–Li–Zn-system during their corrosion testing in NaCl solution and salt spray chamber are studied. During the testing in NaCl solution, the coatings’ barrier properties are severely degraded after the appearance of corrosion damage spots, which manifests itself in the lowering of the impedance modulus in low-frequency region. The NaCl solution induced rapid growth of corrosion area, the more so, for the unsealed coating. Compared to the NaCl solution testing, the growth of corrosion spots is by order of magnitude slower for the salt-spray testing, at which the isolated corrosion damage spots are prevailing.

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ACKNOWLEDGMENTS

Authors extend thanks to the members of the Metal physical studies laboratory of VIAM S.V. Zhitnyuk and S.А. Naprienko for the taking of microphotographs of the coating’s surfaces, performed at a Carl Zeiss EVO MA 10 microscope. This work is performed with the using of equipment from the Research Equipment Sharing Center “Environmental testing” of the National Research Center “Kurchatov Institute”—VIAM.

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Authors and Affiliations

  1. All-Russian Research Institute of Aviation Materials (VIAM), Moscow, Russia

    I. M. Medvedev, A. E. Kutyrev & I. A. Volkov

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  1. I. M. Medvedev
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  2. A. E. Kutyrev
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  3. I. A. Volkov
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Correspondence to I. M. Medvedev.

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Translated by Yu. Pleskov

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Medvedev, I.M., Kutyrev, A.E. & Volkov, I.A. The Study of the Corrosion Damage Influence on the Impedance of Anodic Oxide Coatings. Russ J Electrochem 58, 471–481 (2022). https://doi.org/10.1134/S1023193522060076

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