Journal
BIOFOULING
Volume 32, Issue 1, Pages 109-122Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08927014.2015.1128528
Keywords
Bacterial attachment; biofilm; carbon steel; microbiologically influenced; corrosion; microstructure
Funding
- Defence Materials Technology Centre (DMTC)
- Australian Government's Defence Future Capability Technology Centres Program
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The influence of the composition and microstructure of different carbon steel grades on the initial attachment (<= 60 min) of Escherichia coli and subsequent longer term (28 days) corrosion was investigated. The initial bacterial attachment increased with time on all grades of carbon steel. However, the rate and magnitude of bacterial attachment varied on the different steel grades and was significantly less on the steels with a higher pearlite phase content. The observed variations in the number of bacterial cells attached across different steel grades were significantly reduced by applying a fixed potential to the steel samples. Longer term immersion studies showed similar levels of biofilm formation on the surface of the different grades of carbon steel. The measured corrosion rates were significantly higher in biotic conditions compared to abiotic conditions and were found to be positively correlated with the pearlite phase content of the different grades of carbon steel coupons.
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