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Material challenge for carbon capture and storage - Crevice corrosion susceptibility of super austenitic stainless steel UNS NO8031 (alloy 31) and duplex stainless steel S32101 in CO2 saturated saline brine

  • Corrosion resistance of duplex stainless Steel UNS S32101 and super austenitic stainless Steel UNS NO8031 (alloy 31) was investigated in crevice conditions in a corrosive environment (saline brine, T = 60 °C, C02-flow rate 3-5 L/h, normal pressure) using electrochemical and metallographic techniques. Rectangular rubber was used to form a metal/non-metal-crevice configuration. Potentiodynamic measurements have been carried out in order to determine critical pitting and repassivation potentials. Potentiostatic measurements at different Potentials have been performed and the dependence of pit depth on the potential applied in crevice conditions was investigated. It was shown that the repassivation potential of duplex stainless Steel S32101 coincides with its corrosion potential. Strang pitting corrosion occurred after potentiodynamic measurements with pit depths up to 100 pm. Otherwise, stainless Steel UNS NO8031 shows about 0.5 V difference between the free corrosion potential and theCorrosion resistance of duplex stainless Steel UNS S32101 and super austenitic stainless Steel UNS NO8031 (alloy 31) was investigated in crevice conditions in a corrosive environment (saline brine, T = 60 °C, C02-flow rate 3-5 L/h, normal pressure) using electrochemical and metallographic techniques. Rectangular rubber was used to form a metal/non-metal-crevice configuration. Potentiodynamic measurements have been carried out in order to determine critical pitting and repassivation potentials. Potentiostatic measurements at different Potentials have been performed and the dependence of pit depth on the potential applied in crevice conditions was investigated. It was shown that the repassivation potential of duplex stainless Steel S32101 coincides with its corrosion potential. Strang pitting corrosion occurred after potentiodynamic measurements with pit depths up to 100 pm. Otherwise, stainless Steel UNS NO8031 shows about 0.5 V difference between the free corrosion potential and the repassivation potential and did not show any signs of pitting corrosion after polarization measurements. Slight rouging effects have been observed. By potentiostatic measurements on duplex stainless Steel S32101 potentials slightly more positive than the corrosion Potentials causing strong pitting corrosion, and pit depths up to 650 pm were measured. Super austenitic stainless Steel UNS NO8031 did not exhibit any signs of pitting corrosion even by applying potentials much more positive than the corrosion potential.zeige mehrzeige weniger

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Metadaten
Autor*innen:Oleksandra Yevtushenko, Ralph BäßlerORCiD, I. Carrillo Salgado
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):NACE International corrosion conference 2013 (Proceedings)
Jahr der Erstveröffentlichung:2013
Herausgeber (Institution):NACE International
Verlag:Curran
Verlagsort:Red Hook, NY
Erste Seite:1
Letzte Seite:8 (Paper 2427)
Freie Schlagwörter:CO2; Crevice corrosion; Electrochemical measurements; Pitting corrosion; Saturated saline brine
Veranstaltung:NACE International Corrosion Conference 2013
Veranstaltungsort:Orlando, FL, USA
Beginndatum der Veranstaltung:17.03.2013
Enddatum der Veranstaltung:21.03.2013
ISBN:978-1-627-48145-8
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
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