The effect of Shewanella Oneidensis MR-1 on Microbial Influenced Corrosion (MIC)

Iron-reducing-bacteria (IRB) play important roles in geochemical cycling of iron. Under anaerobic conditions, IRB is capable of reducing insoluble iron (III) to soluble iron (II). Despite its direct involvement in iron redox reactions, the role of IRB in Microbial-Influenced-Corrosion (MIC) remains unclear. There were contradicted report on whether IRB inhibit or enhance corrosion during MIC. In this study, the effect of IRB strains on MIC of iron nail were investigated. Iron nail were added into growth media with the IRB strains and incubated at room temperature anaerobically. The corrosive assessment involved incubation at room temperature for 30 days and the absorbance reading Fe (II) concentration for abiotic control and sample were taken for every few days. Surface topography and composition of the iron nail were observed under Scanning electron microscopy (SEM). The result suggested S.oneidensis MR-1, an IRB strain enhance corrosion as it is also correlate with the increasing of iron (III) reduction activity.