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Titanium Anodes with Active Coatings Based on Iridium Oxides: A Sublayer between the Active Coating and Titanium

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Abstract

An optimum composition and a technique for applying a protecting sublayer on titanium are substantiated experimentally. The sublayer prevents the oxidation of titanium during the production and application of highly porous metal oxide anodes. The formation of such a sublayer involves several stages: (a) coating chemically polished and etched in 5-% hydrofluoric acid titanium with hexachloroiridic acid, (b) drying hexachloroiridic acid, (c) a two-step treatment of anodes in argon with a low concentration of oxygen at 350°C, and (d) a brief annealing of the anodes in air at 400°C. The application of such a sublayer makes sense especially in the case of an anode with a thin highly porous active coating. The remarkable protecting properties of the sublayer are due to the formation of a dense coating on titanium. The coating consists of metallic iridium, titanium, and an amount of oxides of these metals. The titanium substrate itself undergoes minimum oxidation.

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Authors and Affiliations

  1. Russian Federation Scientific Center, “Karpov Research Institute of Physical Chemistry,”, ul. Vorontsovo pole 10, Moscow, 105064, Russia

    V. V. Gorodetskii & V. A. Neburchilov

Authors
  1. V. V. Gorodetskii
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  2. V. A. Neburchilov
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Gorodetskii, V.V., Neburchilov, V.A. Titanium Anodes with Active Coatings Based on Iridium Oxides: A Sublayer between the Active Coating and Titanium. Russian Journal of Electrochemistry 39, 1111–1115 (2003). https://doi.org/10.1023/A:1026131706020

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  • DOI: https://doi.org/10.1023/A:1026131706020

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