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Physical Model for Electrochemical Oxidation of Composite Ceramics

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Powder Metallurgy and Metal Ceramics Aims and scope

The paper examines the corrosion behavior of dense ZrB2-based ceramic samples in simulated seawater (3% NaCl solution) using polarization curves of electrochemical oxidation (ECO). The dense ceramic samples of 3–5% porosity were produced by hot pressing and had the following composition (wt.%): ZrB2, 77 ZrB2–23 SiC, 70 ZrB2–20 SiC–10 AlN, and 60 ZrB2–20 SiC– 20 (Al2O3–ZrO2). The main ECO parameters were the conduction current i, corrosion current icorr (i value at which di/dE decreased through diversion of some oxygen ions to oxidize the material), and anode potential Ea (E value at which the protective oxide film failed (i > 0)). A two-stage model of the ECO process was proposed upon analysis of the experimental data. At the first stage (E < Ea, i = 0), an oxide film developed on the effective surface: the higher the protective function of the oxide film, the greater its thermodynamic stability. The second ECO stage (E > Ea, i > 0) had two steps of changing the conduction current i, carried by negative oxygen ions. The first step was characterized by an avalanche-like increase in i at E = Ea up to maximum i = icorr, at which the rate of change in i decreased with increasing anode potential (di/dE). At higher icorr (second step), the increase in icorr with greater E slowed down through the interaction of oxygen with the test material, i.e., through oxidation. The higher the maximum icorr value, the greater the oxidation resistance of the material. According to the proposed model, the highest values of Ea and icorr in ECO conditions for ZrB2–SiC materials are reached when AlN is added as it promotes the formation of thermodynamically stable mullite in the protective film. An Al2O3–ZrO2 oxide addition increases the oxidation resistance of the material (high icorr values) but does not change the composition of the outer borosilicate glass film. This explains the close anode potentials of the 77 ZrB2–23 SiC (Ea= 0.1 V) and 60 ZrB2–20 SiC–20 (68 Al2O3–32 ZrO2) composites (Ea = 0 V).

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Acknowledgment

The authors are grateful to Professor A.D. Panasyuk for providing compact ceramic samples for the experiments.

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Authors and Affiliations

  1. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    O.N. Grigoriev, V.A. Lavrenko, I.A. Podchernyaeva, D.V. Yurechko, V.M. Talash, V.A. Shvets, D.V. Vedel & V.M. Panashenko

  2. National Aviation University of Ukraine, Kyiv, Ukraine

    V.F. Labunets

Authors
  1. O.N. Grigoriev
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  2. V.A. Lavrenko
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  3. I.A. Podchernyaeva
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  4. D.V. Yurechko
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  5. V.M. Talash
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  6. V.A. Shvets
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  7. D.V. Vedel
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  8. V.M. Panashenko
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  9. V.F. Labunets
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Corresponding author

Correspondence to D.V. Yurechko.

Additional information

V.A. Lavrenko is deceased.

Translated from Poroshkova Metallurgiya, Vol. 60, Nos. 5–6 (539), pp. 111–117, 2021.

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Grigoriev, O., Lavrenko, V., Podchernyaeva, I. et al. Physical Model for Electrochemical Oxidation of Composite Ceramics. Powder Metall Met Ceram 60, 346–351 (2021). https://doi.org/10.1007/s11106-021-00249-7

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  • DOI: https://doi.org/10.1007/s11106-021-00249-7

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