Sigma phase formation and polarization response of UNS S31803 in sulfuric acid

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dc.contributor.authorMagnabosco R.
dc.contributor.authorAlonso-Falleiros N.
dc.date.accessioned2019-08-20T00:17:35Z
dc.date.available2019-08-20T00:17:35Z
dc.date.issued2005
dc.description.abstractFor a better understanding of the relationship between the microstructure of UNS S31803 duplex stainless steel (DSS) and the shape of the polarization curves, this study evaluated the influence of the microstructure on the potentiodynamic polarization of the 850°C isothermal-aged UNS S31803 DSS in 0.5 M sulfuric acid (H2SO4). In the transpassive region, selective corrosion of chromium- and molybdenum-rich phases occurred. In the solution-treated sample, ferrite was selectively corroded, and in all aged samples, the sigma phase was the selectively corroded phase. Five current density maxima in the passive region were found during potentiodynamic polarization, and they can be related to the microstructures formed. The current density maximum at 564 mV us. saturated calomel electrode (SCE) can be related to secondary ferrite, impoverished in chromium and molybdenum, that was formed during direct precipitation of sigma phase from the original ferrite. Secondary austenite, impoverished in chromium and molybdenum and formed together with the sigma phase during eutectoid decomposition of the original ferrite, can be related to the current density maxima at -85 mVSCE and -40 mVSCE. The austenite phase, present in all heat-treatment conditions, can be related to the current density maxima at -155 mVSCE and 111 mVSCE. © 2005, NACE International.
dc.description.firstpage807
dc.description.issuenumber8
dc.description.lastpage814
dc.description.volume61
dc.identifier.citationMAGNABOSCO, R.; Alonso-Falleiros, N.. Sigma Phase Formation and Polarization Response of UNS S31803 in Sulfuric Acid. Corrosion (Houston, Tex.), v. 61, n. 8, p. 807, 2005.
dc.identifier.doi10.5006/1.3278215
dc.identifier.issn0010-9312
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/2267
dc.relation.ispartofCorrosion
dc.rightsAcesso Restrito
dc.subject.otherlanguageDuplex stainless steel
dc.subject.otherlanguageMicrostructure
dc.subject.otherlanguagePotentiodynamic polarization
dc.subject.otherlanguageSigma phase
dc.subject.otherlanguageSulfuric acid
dc.subject.otherlanguageUNS S31803
dc.titleSigma phase formation and polarization response of UNS S31803 in sulfuric acid
dc.typeArtigo
fei.scopus.citations16
fei.scopus.eid2-s2.0-27544480002
fei.scopus.subjectDuplex stainless steel
fei.scopus.subjectPotentiodynamic polarization
fei.scopus.subjectSigma phase
fei.scopus.updated2024-11-01
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=27544480002&origin=inward
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