Microbiologically influenced corrosion mechanism of 304L stainless steel in treated urban wastewater and protective effect of silane-TiO2 coating
| Autor: | L. Bousselmi, I. Ziadi, Marta M. Alves, H. Hassairi, Maria de Fátima Montemor, Maryna G. Taryba, L. El-Bassi, H. Akrout |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope 010401 analytical chemistry Biophysics Energy-dispersive X-ray spectroscopy 02 engineering and technology General Medicine engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Silane 0104 chemical sciences Dielectric spectroscopy Corrosion chemistry.chemical_compound Chemical engineering Coating Wastewater chemistry Electrochemistry engineering Physical and Theoretical Chemistry Aeration 0210 nano-technology |
| Zdroj: | Bioelectrochemistry. 132:107413 |
| ISSN: | 1567-5394 |
| DOI: | 10.1016/j.bioelechem.2019.107413 |
| Popis: | Microbiologically influenced corrosion (MIC) of bare and silane-TiO2 sol-gel coated stainless steel (SS) was studied in treated urban wastewater (TUWW). Combining the electrochemical impedance spectroscopy (EIS) and the scanning vibrating electrode technique (SVET) showed that SS surface colonization occurs, at earlier stages, by iron-oxidizing bacteria (IOB), and later by sulphate-reducing bacteria (SRB). The SVET results showed that chemical corrosion process and bacterial respiration led to the depletion of dissolved oxygen, creating a differential aeration cell and thus a localized corrosion phenomenon. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that the growth of a bacterial biofilm on 304L SS was a dynamic process, stimulating the localized oxidation of SS. To improve corrosion protection, a silane-TiO2 sol-gel coating for SS is proposed. SEM showed that the coating reduced bacterial adhesion and EIS study demonstrated that the coating improved the barrier properties and corrosion resistance of 304L SS in TUWW over a short period of immersion. |
| Databáze: | OpenAIRE |
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