Abstract:
:Bacillus widely exists in wet natural environment such as soil, water and air, and is often studied as one of representative microorganisms for microbiologically influenced corrosion(MIC) research. In this paper, the growth curve of Bacillus subtilis isolated from marine environment was determined by turbidimetry and its effect on corrosion behavior of 10MnNiCrCu steel was studied by open circuit potential, AC impedance, polarization curve and scanning electron microscopy(SEM). The results showed that with the change of the growth curve of Bacillus subtilis(BS), the open circuit potential(Eocp) shifted positively and then negatively, and the charge transfer resistance shown by AC impedance was much lower than that of the sterile system, increasing first and then decreasing. The polarization curves showed that the corrosion current density in BS medium was obviously higher than that in sterile system. The corrosion morphology observation showed that although a biofilm by BS developed on the steel surface, the localized corrosion of 10MnNiCrCu steel was aggravated due to the acidness of the metabolite itself and the biofilm with access for electrolyte ions.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Wang YS,Liu L,Fu Q,Sun J,An ZY,Ding R,Li Y,Zhao XDdoi
10.1038/s41598-020-62809-ysubject
Has Abstractpub_date
2020-04-01 00:00:00pages
5744issue
1issn
2045-2322pii
10.1038/s41598-020-62809-yjournal_volume
10pub_type
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