When material science meets microbial ecology: Bacterial community selection on stainless steels in natural seawater
0301 basic medicine
570
Bacteria
Materials Science
500
Oxides
02 engineering and technology
Stainless Steel
Corrosion
03 medical and health sciences
Steel
13. Climate action
Biofilms
Humans
Seawater
14. Life underwater
0210 nano-technology
DOI:
10.1016/j.colsurfb.2022.112955
Publication Date:
2022-10-20T16:24:58Z
AUTHORS (10)
ABSTRACT
The passive film depends on the alloy's composition and the exposure conditions. How the surface composition affects the selection of microbial biofilms though, has not been fully elucidated or incorporated into the analysis of corrosive biofilms. The degradation of stainless steel (SS) exposed to natural seawater was studied to understand how the oxide layer composition of SS could affect the selection and variability of the bacterial community. To accomplish this goal, austenitic and superferritic SS grades were exposed to natural seawater on the central coast of Chile. The deterioration of steel and qualitative description of biofilm formation was monitored at different exposure periods. Biofilms were evaluated based on massive sequencing analysis of the bacterial community and subsequent ecological studies. The results revealed that variability of the calculated corrosion rate correlated with the similarity of the bacterial community within samples from each SS and its corrosion inferred capacity. The associated bacterial families showed a higher representation in SSs with a more significant increase in the Fe/Cr ratio over the exposure time. These findings revealed that iron content in the oxide layer represents a key feature of the surface composition for selecting bacterial assemblages in marine environments.
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