title: Studies on microbiologically influenced corrosion of SS304 by a novel manganese oxidizer, Bacillus flexus.
abstract: A manganese oxidizing bacterium was isolated from the surface of steel scraps and biochemical tests and 16S rRNA sequencing analysis confirmed the isolate as Bacillus flexus. Potentiodynamic polarization curves showed ennoblement of open circuit potential, increased passive current, a lowering of breakdown potential, active re-passivation potential and enhanced cathodic current in the presence of B. flexus. Adhesion studies with B. flexus on SS304 specimens with different surface treatments demonstrated decreased adhesion on passivated and FeCl(3) treated specimens due to the removal of MnS inclusions. The present study provides evidence that surface treatment of stainless steels can reduce adhesion of this manganese oxidizing bacterium and decrease the probability of microbiologically influenced corrosion.
authors.affiliation: CSTD , Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India.
authors.forename: B
authors.initials: B
authors.lastname: Anandkumar
authors.forename: R P
authors.initials: RP
authors.lastname: George
authors.forename: S
authors.initials: S
authors.lastname: Tamilvani
authors.forename: N
authors.initials: N
authors.lastname: Padhy
authors.forename: U Kamachi
authors.initials: UK
authors.lastname: Mudali
mesh_terms: D001407:Bacillus / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D001422:Bacterial Adhesion; D018441:Biofilms; D003343:Corrosion; D004563:Electrochemistry; D005290:Ferric Compounds / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008345:Manganese / Q000378:metabolism*; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D010802:Phylogeny; D011199:Potentiometry; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013171:Spores, Bacterial / Q000648:ultrastructure; D013193:Stainless Steel / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D005290:Ferric Compounds; D012336:RNA, Ribosomal, 16S; D013193:Stainless Steel; D008345:Manganese