Cargando…

Iron cycling at corroding carbon steel surfaces

Surfaces of carbon steel (CS) exposed to mixed cultures of iron-oxidizing bacteria (FeOB) and dissimilatory iron-reducing bacteria (FeRB) in seawater media under aerobic conditions were rougher than surfaces of CS exposed to pure cultures of either type of microorganism. The roughened surface, demon...

Descripción completa

Detalles Bibliográficos
Autores principales: Lee, Jason S., McBeth, Joyce M., Ray, Richard I., Little, Brenda J., Emerson, David
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Taylor & Francis 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3827670/
https://www.ncbi.nlm.nih.gov/pubmed/24093730
http://dx.doi.org/10.1080/08927014.2013.836184
_version_ 1782478277314609152
author Lee, Jason S.
McBeth, Joyce M.
Ray, Richard I.
Little, Brenda J.
Emerson, David
author_facet Lee, Jason S.
McBeth, Joyce M.
Ray, Richard I.
Little, Brenda J.
Emerson, David
author_sort Lee, Jason S.
collection PubMed
description Surfaces of carbon steel (CS) exposed to mixed cultures of iron-oxidizing bacteria (FeOB) and dissimilatory iron-reducing bacteria (FeRB) in seawater media under aerobic conditions were rougher than surfaces of CS exposed to pure cultures of either type of microorganism. The roughened surface, demonstrated by profilometry, is an indication of loss of metal from the surface. In the presence of CS, aerobically grown FeOB produced tight, twisted helical stalks encrusted with iron oxides. When CS was exposed anaerobically in the presence of FeRB, some surface oxides were removed. However, when the same FeOB and FeRB were grown together in an aerobic medium, FeOB stalks were less encrusted with iron oxides and appeared less tightly coiled. These observations suggest that iron oxides on the stalks were reduced and solubilized by the FeRB. Roughened surfaces of CS and denuded stalks were replicated with three culture combinations of different species of FeOB and FeRB under three experimental conditions. Measurements of electrochemical polarization resistance established different rates of corrosion of CS in aerobic and anaerobic media, but could not differentiate rate differences between sterile controls and inoculated exposures for a given bulk concentration of dissolved oxygen. Similarly, total iron in the electrolyte could not be used to differentiate treatments. The experiments demonstrate the potential for iron cycling (oxidation and reduction) on corroding CS in aerobic seawater media.
format Online
Article
Text
id pubmed-3827670
institution National Center for Biotechnology Information
language English
publishDate 2013
publisher Taylor & Francis
record_format MEDLINE/PubMed
spelling pubmed-38276702013-11-20 Iron cycling at corroding carbon steel surfaces Lee, Jason S. McBeth, Joyce M. Ray, Richard I. Little, Brenda J. Emerson, David Biofouling Research Article Surfaces of carbon steel (CS) exposed to mixed cultures of iron-oxidizing bacteria (FeOB) and dissimilatory iron-reducing bacteria (FeRB) in seawater media under aerobic conditions were rougher than surfaces of CS exposed to pure cultures of either type of microorganism. The roughened surface, demonstrated by profilometry, is an indication of loss of metal from the surface. In the presence of CS, aerobically grown FeOB produced tight, twisted helical stalks encrusted with iron oxides. When CS was exposed anaerobically in the presence of FeRB, some surface oxides were removed. However, when the same FeOB and FeRB were grown together in an aerobic medium, FeOB stalks were less encrusted with iron oxides and appeared less tightly coiled. These observations suggest that iron oxides on the stalks were reduced and solubilized by the FeRB. Roughened surfaces of CS and denuded stalks were replicated with three culture combinations of different species of FeOB and FeRB under three experimental conditions. Measurements of electrochemical polarization resistance established different rates of corrosion of CS in aerobic and anaerobic media, but could not differentiate rate differences between sterile controls and inoculated exposures for a given bulk concentration of dissolved oxygen. Similarly, total iron in the electrolyte could not be used to differentiate treatments. The experiments demonstrate the potential for iron cycling (oxidation and reduction) on corroding CS in aerobic seawater media. Taylor & Francis 2013-10-07 2013-11 /pmc/articles/PMC3827670/ /pubmed/24093730 http://dx.doi.org/10.1080/08927014.2013.836184 Text en http://www.informaworld.com/mpp/uploads/iopenaccess_tcs.pdf This is an open access article distributed under the Supplemental Terms and Conditions for iOpenAccess articles published in Taylor & Francis journals (http://www.informaworld.com/mpp/uploads/iopenaccess_tcs.pdf) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Lee, Jason S.
McBeth, Joyce M.
Ray, Richard I.
Little, Brenda J.
Emerson, David
Iron cycling at corroding carbon steel surfaces
title Iron cycling at corroding carbon steel surfaces
title_full Iron cycling at corroding carbon steel surfaces
title_fullStr Iron cycling at corroding carbon steel surfaces
title_full_unstemmed Iron cycling at corroding carbon steel surfaces
title_short Iron cycling at corroding carbon steel surfaces
title_sort iron cycling at corroding carbon steel surfaces
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3827670/
https://www.ncbi.nlm.nih.gov/pubmed/24093730
http://dx.doi.org/10.1080/08927014.2013.836184
work_keys_str_mv AT leejasons ironcyclingatcorrodingcarbonsteelsurfaces
AT mcbethjoycem ironcyclingatcorrodingcarbonsteelsurfaces
AT rayrichardi ironcyclingatcorrodingcarbonsteelsurfaces
AT littlebrendaj ironcyclingatcorrodingcarbonsteelsurfaces
AT emersondavid ironcyclingatcorrodingcarbonsteelsurfaces