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dc.contributor.authorChan, E.
dc.contributor.authorJohn, Doug
dc.contributor.authorBailey, Stuart
dc.contributor.authorKinsella, Brian
dc.contributor.editorBruce Miglin
dc.identifier.citationChan, Emilyn and John, Doug and Bailey, Stuart and Kinsella, Brian. 2008. Galvanic Corrosion of Carbon Steel in Carbon Dioxide Caused by Magnetite. Paper Number 3092, in Bruce Miglin (ed), ICC 2008, Oct 6 2008. Las Vegas: NACE International.

Complex environments in oil and gas production systems often result in the deposition of various corrosion product scales on the carbon steel surface. It is not widely recognized that many iron corrosion products, particularly magnetite, are nonmetallic semiconductors that furnish galvanic coupling to their base metal, resulting in galvanic corrosion. Laser Raman spectroscopy is a very powerful analysis technique that has been applied to identify iron oxides/hydroxides such as magnetite (Fe3O4), hematite (Fe2O3), goethite (a-FeOOH) and lepidocrocite (?-FeOOH) based on the unique Raman spectral band.A galvanic couple of magnetite with mild steel was investigated under a carbon dioxide atmosphere, and this indeed demonstrated galvanic corrosion of the steel. The effects of carbon dioxide partial pressure, solution pH and cathode to anode surface area ratio of the magnetite/mild steel couple were studied and all of these factors were found to have a significant effect on the galvanic corrosion rate.The presence of magnetite scale may explain the high localised corrosion rates experienced in some oil production lines operating at low partial pressures of CO2 and environments normally considered non-corrosive. Corrosion inhibitors with high inhibition efficiency in carbon dioxide corrosion of mild steel were tested, and were found not to be as effective in galvanic corrosion control. An understanding of the electrochemistry and chemistry of the corrosion products will be the key to resolve this problem.

dc.publisherNACE International
dc.subjectRaman spectroscopy
dc.subjectiron oxides
dc.subjectcorrosion product scale
dc.subjectGalvanic corrosion
dc.titleGalvanic Corrosion of Carbon Steel in Carbon Dioxide Caused by Magnetite Paper Number 3092
dc.typeConference Paper
dcterms.source.titleProceedings of International Corrosion Congress 2008
dcterms.source.seriesProceedings of International Corrosion Congress 2008
dcterms.source.conferenceICC 2008
dcterms.source.conference-start-dateOct 6 2008
dcterms.source.conferencelocationLas Vegas
dcterms.source.placeHouston, TX
curtin.accessStatusFulltext not available
curtin.facultyDepartment of Applied Chemistry
curtin.facultySchool of Science and Computing
curtin.facultyFaculty of Science and Engineering

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