Rotated cage corrosion experiments (4 m/s) were performed with flat coupons of 2 carbon steels (38Mn6/C75, X65) and 3 Cr-containing steels (X20Cr13, X2CrNiMoN22-5-3 (1.4462) and X1NiCrMoCu 25-20-5 (1.4539)) in the presence of supercritical carbon dioxide (scCO2) and different amounts of water at 50, 80, 110 and 130°C. While water-free scCO2 is non-corrosive for C-and Cr-containing steels, water mist saturated with scCO2 was corrosive for C-steels, however not for 13Cr or CrNi steels even up to 130°C. Droplets of water mist, saturated with scCO2, caused localized attack when touching the C-steel surface. Water phases saturated with scCO2 were very corrosive for C-steels in the whole range of 50 to 130°C (corrosion rates 5-15 mm/y and mesa-type localized attack). Under such conditions also the resistance of 13Cr steel was not acceptable (corrosion rates 0.3 to 0.8 mm/y). Even the austenitic-ferritic (1.4462) and the austenitic CrNi steel (1.4539) surpassed the target line of 0.1 mm/y at 110°C when contacted with water saturated with scCO2.

Subject
Pits, Water, Materials, Corrosion rate, Autoclaves, Steel coupons, Iron, Solubility, Liquids, Steel, Carbon steel, Corrosion protection, Alloys
Keywords:
carbon steels, 13 Cr steel, duplex steel, austenitic CrNi steel, water, corrosion, supercritical carbon dioxide, rotated cage
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2011
Association for Materials Protection and Performance (AMPP)
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