Effect of Sulphate-Reducing Bacteria Activity on the Performance of Thermally Sprayed Aluminium and Polyurethane Coatings

In the present work, we studied whether the exposure of synthetic seawater with anaerobic sulphate-reducing bacteria (SRB) on some steel samples generates a bacterial biofilm in their surfaces. Bare steel belonging to a mooring chain as well as two coating systems applied on the steel surface were s...

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Bibliographic Details
Published inCrystals (Basel) Vol. 14; no. 3; p. 260
Main Authors Santos-Pereda, Iñigo, Madina, Virginia, Rodriguez, Elena, Jorcin, Jean-Baptiste, Acha, Esther
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2024
Subjects
Aluminum
Bacteria
Biofilms
Cathodic protection
Coatings
Corrosion potential
corrosion protection
Corrosion resistance
Docking and mooring gear
Hydrogen
Influence
Mechanical properties
microbiologically influenced corrosion
Microorganisms
mooring chain
polyurethane
Polyurethane resins
Polyurethanes
Scanning microscopy
Seawater
Sulfate reduction
Sulfates
sulphate-reducing bacteria SRB
thermally sprayed aluminium
X-ray spectroscopy
Spain
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Summary:In the present work, we studied whether the exposure of synthetic seawater with anaerobic sulphate-reducing bacteria (SRB) on some steel samples generates a bacterial biofilm in their surfaces. Bare steel belonging to a mooring chain as well as two coating systems applied on the steel surface were studied: polyurethane (PU) and thermally sprayed aluminium (TSA) with and without an epoxy-based sealant. After 30 days of immersion in SRB-inoculated synthetic seawater, a bacterial count was attained, and the samples were observed using scanning electron microscopy (SEM) and locally analysed using X-ray scattered energy spectroscopy (EDS). A biofilm developed on every tested surface (continuous or in the form of pustules), with evidence of metabolic activity of the SRB. Finally, a mechanism of degradation for TSA in the presence of SRB is proposed for environments with a high concentration of bacteria.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst14030260