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Effect of Nb alloying additions on the characteristics of anodic oxide films on zirconium and their stability in NaOH solution

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Abstract

The characteristics of oxide films on Zr and Zr–Nb alloys (with Nb content of 2.5, 5, and 10 at.%) galvanostatically formed (at a current density of 100 μA cm−2) in 0.5 M H2SO4 solution were investigated by means of electrochemical impedance spectroscopy. Electrochemical impedance spectroscopy spectra were interpreted in terms of an “equivalent circuit” with the circuit elements representing the electrochemical properties of a single layer oxide. The resistance of the oxide films was found to increase with increased Nb content in the alloy while the capacitance showed an opposite trend. The stability of the anodic oxide films grown in the sulfuric acid solution on Zr and Zr–Nb alloys was investigated by simultaneously measuring the electrode capacitance and resistance at a working frequency of 1 kHz as a function of exposure time to naturally aerated 3 M NaOH solution. Analyses of the electrode capacitance and resistance values indicated a decrease in chemical dissolution rate of the oxide films with the increase of Nb content in the alloy.

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Authors and Affiliations

  1. Politecnico di Torino, Dipartimento di Scienza dei Materiali e Ingegneria Chimica (DICHI), Corso Duca degli Abruzzi 24, 10129, Torino, Italy

    Francesco Rosalbino & Emma Angelini

  2. Università degli Studi di Genova, Dipartimento di Chimica e Chimica Industriale (DCCI), Via Dodecaneso 31, 16146, Genova, Italy

    Daniele Macciò, Adriana Saccone & Stefano Delfino

Authors
  1. Francesco Rosalbino
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  2. Daniele Macciò
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  3. Adriana Saccone
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  4. Emma Angelini
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  5. Stefano Delfino
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Correspondence to Francesco Rosalbino.

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Rosalbino, F., Macciò, D., Saccone, A. et al. Effect of Nb alloying additions on the characteristics of anodic oxide films on zirconium and their stability in NaOH solution. J Solid State Electrochem 14, 1451–1455 (2010). https://doi.org/10.1007/s10008-009-0971-6

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  • DOI: https://doi.org/10.1007/s10008-009-0971-6

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