AI Article Synopsis
- The study investigates how microbiologically influenced corrosion (MIC) affects stainless steel (SS) in treated urban wastewater (TUWW), focusing on both bare and silane-TiO sol-gel coated surfaces.
- Results reveal that iron-oxidizing bacteria (IOB) initially colonize the SS, followed by sulfate-reducing bacteria (SRB), leading to localized corrosion due to oxygen depletion from bacterial respiration.
- The silane-TiO sol-gel coating significantly enhances the corrosion resistance of 304L SS by reducing bacterial adhesion and improving its barrier properties during short immersion periods.
Article Abstract
Microbiologically influenced corrosion (MIC) of bare and silane-TiO 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-TiO 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.
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| http://dx.doi.org/10.1016/j.bioelechem.2019.107413 | DOI Listing |
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