Anodic films were grown on Weathering Steel by potentiostatic polarization in slightly alkaline solution. The photoelectrochemical results reveal that they are n-type iron oxide with Eg = 2.0 eV. Rust layer grown by atmospheric corrosion are n-type semiconductors with a band gap higher than that estimated for the anodic film attributed to the formation of γ-lepidocrocite. The electrochemical impedance spectra allow to evidence that rust layers have a higher conductivity with respect to anodic films due to the presence of highly doped iron oxide layers. The use of Mott-Schottky theory to model the dependence of oxide capacitance as function of potential is critically discussed.

Tranchida G., Di Franco F., Megna B., & Santamaria M. (2020). Semiconducting properties of passive films and corrosion layers on weathering steel. ELECTROCHIMICA ACTA, 354 [10.1016/j.electacta.2020.136697].

Semiconducting properties of passive films and corrosion layers on weathering steel

Tranchida G.;Di Franco F.
;
Megna B.;Santamaria M.
2020

Abstract

Anodic films were grown on Weathering Steel by potentiostatic polarization in slightly alkaline solution. The photoelectrochemical results reveal that they are n-type iron oxide with Eg = 2.0 eV. Rust layer grown by atmospheric corrosion are n-type semiconductors with a band gap higher than that estimated for the anodic film attributed to the formation of γ-lepidocrocite. The electrochemical impedance spectra allow to evidence that rust layers have a higher conductivity with respect to anodic films due to the presence of highly doped iron oxide layers. The use of Mott-Schottky theory to model the dependence of oxide capacitance as function of potential is critically discussed.
Settore ING-IND/23 - Chimica Fisica Applicata
Settore ING-IND/22 - Scienza E Tecnologia Dei Materiali
Tranchida G., Di Franco F., Megna B., & Santamaria M. (2020). Semiconducting properties of passive films and corrosion layers on weathering steel. ELECTROCHIMICA ACTA, 354 [10.1016/j.electacta.2020.136697].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/433344
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