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, CO2-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. Strong pitting corrosion occurred after potentiodynamic measurements with pit depths up to 100 µm. 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 µm 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.
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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
Oleksandra Yevtushenko;
Oleksandra Yevtushenko
BAM - Federal Institute for Materials
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Ralph Bäßler;
Ralph Bäßler
BAM - Federal Institute for Materials
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Irene Carrillo-Salgado
Irene Carrillo-Salgado
Engineering Institute of Baja California Autonomous University
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Paper presented at the CORROSION 2013, Orlando, Florida, March 2013.
Paper Number:
NACE-2013-2427
Published:
March 17 2013
Citation
Yevtushenko, Oleksandra, Bäßler, Ralph, and Irene Carrillo-Salgado. "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" Paper presented at the CORROSION 2013, Orlando, Florida, March 2013.
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