Semiconducting properties of passive films and corrosion layers on weathering steel

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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.
Original languageEnglish
Number of pages10
JournalElectrochimica Acta
Volume354
Publication statusPublished - 2020

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Electrochemistry

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