Search results for "Weathering steel"

showing 2 items of 2 documents

Semiconducting properties of passive films and corrosion layers on weathering steel

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.

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-technologybusiness
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Inhibition of Cor-Ten steel corrosion by “green” extracts of Brassica campestris

2018

Abstract Extract of Brassica campestris was tested as potential corrosion inhibitor for Cor-Ten steel in NaCl and acidic solutions, simulating a marine and an urban-industrial environment, respectively. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were performed both in absence and in presence of the extract at room temperature. The surface chemical analysis was investigated by X-ray Photoemission Spectroscopy (XPS), before and after corrosion. Electrochemical results demonstrated that a very small concentration of Brassica campestris extracts can inhibit Cor-Ten corrosion in NaCl solution (inhibition efficiency of 80–84%) better than in acidic solutions. Su…

Materials sciencePhotoemission spectroscopyGeneral Chemical EngineeringBrassica02 engineering and technologyWeathering steelengineering.material010402 general chemistryElectrochemistry01 natural sciencesAcidic corrosionCorrosion'Green' corrosion inhibitorsCorrosion inhibitorchemistry.chemical_compoundMarine corrosionX-ray photoelectron spectroscopyWeathering steelGeneral Materials ScienceChemical Engineering (all)Acidic corrosion; Brassica campestris; Cor-Ten; Marine corrosion; Weathering steel; ‘Green’ corrosion inhibitors; Chemistry (all); Chemical Engineering (all); Materials Science (all)biologyChemistry (all)fungifood and beveragesGeneral Chemistry021001 nanoscience & nanotechnologybiology.organism_classificationBrassica campestris'Green' corrosion inhibitor0104 chemical sciencesDielectric spectroscopychemistryCor-TenBrassica campestriengineeringMaterials Science (all)0210 nano-technology‘Green’ corrosion inhibitorsNuclear chemistry
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