6533b7dafe1ef96bd126e412
RESEARCH PRODUCT
Semiconducting properties of passive films and corrosion layers on weathering steel
G. TranchidaF. Di FrancoBartolomeo MegnaMonica Santamariasubject
Materials scienceBand gapGeneral Chemical EngineeringIron oxide02 engineering and technologyWeathering steelengineering.materialConductivity010402 general chemistry01 natural sciencesCorrosionchemistry.chemical_compoundElectrochemistryPolarization (electrochemistry)Band gap Carbon steel EIS Mott–Schottky theory Semiconductorsbusiness.industryDoping021001 nanoscience & nanotechnology0104 chemical sciencesSemiconductorSettore ING-IND/23 - Chimica Fisica ApplicataSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialichemistryChemical engineeringengineering0210 nano-technologybusinessdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-09-01 |