Study of microbiologically induced corrosion of 5052 aluminum alloy by sulfate-reducing bacteria in seawater

This study evaluated the biocorrosion on 5052 aluminum alloy caused by sulfate-reducing bacteria (SRB) inoculated in sterile seawater. Specimens were immersed in two reactors, one containing only sterile seawater and other containing sterile seawater with inoculum of sulfate reducing bacteria (SRB)....

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Bibliographic Details
Published in:Materials chemistry and physics 2020-02, Vol.241, p.122296, Article 122296
Main Authors: de Andrade, Jéssica Simões, Vieira, Magda Rosângela Santos, Oliveira, Sara Horácio, de Melo Santos, Suseanne Kedma, Urtiga Filho, Severino Leopoldino
Format: Article
Language:English
Subjects:
Aluminum alloy
Aluminum alloys
Aluminum base alloys
Bacteria
Bacterial corrosion
Biocorrosion
Biofilms
Corrosion
Corrosion tests
Electron microscopes
Evaluation
Inoculum
Localized corrosion
Microbiologically induced corrosion
Morphology
Open circuit voltage
Optical microscopy
Scanning electron microscopy
Seawater
Submerging
Substrates
Sulfate reduction
Sulfate-reducing bacteria
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Summary:This study evaluated the biocorrosion on 5052 aluminum alloy caused by sulfate-reducing bacteria (SRB) inoculated in sterile seawater. Specimens were immersed in two reactors, one containing only sterile seawater and other containing sterile seawater with inoculum of sulfate reducing bacteria (SRB). The biofilm formation was assessed by periodic analyses of microbial quantification and Scanning Electron Microscopy (SEM) over 48 days of immersion. The Open Circuit Potential (OCP) was monitored for a period of 15 days. To evaluate the corrosion, morphology images were obtained using SEM and optical microscopy. The results demonstrated that the SRB showed high adhesion to the metal substrate. Localized corrosion morphology was identified for the two conditions studied. Better results of mass loss, OCP, polarization and EIS were observed for aluminum alloy exposed to seawater with SRB, evidencing the protective effect of the formed biofilm. [Display omitted] •Localized corrosion was observed on 5252 Al alloy in seawater with and without SRB.•Sulfate-reducing bacteria showed high adhesion to the metal substrate.•The biofilm formed promoted a protective barrier on 5052 Al alloy surface.•EIS analysis suggests the formation of a passive layer in the medium with SRB.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2019.122296