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Thermodynamic calculation of flade potential of Fe, Ni, and Cr taking into account surface energy

  • Physicochemical Processes at the Interfaces
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Abstract

A method for the thermodynamic estimation of the active-passive transition potential of metals (Flade potential) in sulfuric acid (pH 0) is proposed. This theoretical calculation of the Flade potential (E 0 F )) differs from the conventional one in that the Gibbs formation energy of the metal oxide on the surface ΔG Ox/0Me is a sum of the Gibbs formation energy of the oxide ΔG 0 T < 0 and the surface Gibbs energy of the metal ΔG 0S,Me > 0. The technique of ΔG 0S,Me estimation used is based on the concept of the auto-adsorption of metal atoms (A) in the superficial layer and obeys the Gibbs adsorption equation σ = −GAΔμA. The estimated Flade potentials of Ni, Cr, and Fe agree with the known experimental data.

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Authors and Affiliations

  1. Moscow Institute of Steel and Alloys, State Technological University, Leninskii pr. 4, Moscow, 119049, Russia

    Yu. Ya. Andreev

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  1. Yu. Ya. Andreev
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Correspondence to Yu. Ya. Andreev.

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Original Russian Text © Yu.Ya. Andreev, 2009, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2009, Vol. 45, No. 6, pp. 587–592.

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Andreev, Y.Y. Thermodynamic calculation of flade potential of Fe, Ni, and Cr taking into account surface energy. Prot Met Phys Chem Surf 45, 669–674 (2009). https://doi.org/10.1134/S2070205109060057

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  • DOI: https://doi.org/10.1134/S2070205109060057

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