Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-44776 Zeitschriftenartikel Stephan-Scherb, Christiane; Nützmann, Kathrin; Kranzmann, Axel; Klaus, M.; Genzel, C. Real time observation of high temperature oxidation and sulfidation of Fe-Cr model alloys Insights into early damage mechanisms during high-temperature gas corrosion provide important aspects for the prediction of the long-term stability of hightemperature materials exposed to a hot and corrosive environment. The current work presents a real time study concerning the combined oxidation and sulfidation of ferritic model alloys in a hot SO2 containing atmosphere using energy dispersive X-ray diffraction. The applied high temperature reactor allows the transmittance of high energetic X-rays in order to collect X-ray diffraction pattern of the sample surface in situ during the reaction with the reactive environment. The results revealed that the first phases crystallizing on iron with 2 wt% chromium and with 9 wt% chromium are oxides. The aging experiments at T = 650° C with 0.5% SO2 and 99.5% Ar were followed in situ and caused an external mixed oxide-sulfide layer on top of iron with 2 wt% chromium. On the higher alloyed material the external scale consists of iron oxides and the inner scale of mixed (Fe,Cr)-oxides and chromium-sulfides. The oxide content continuously increases parallel to an increase of the sulfide amount. Thus, the initially formed (Fe,Cr)-oxides do not have a protective character and support the transport of sulfur through the growing oxide scale. Wiley VCH Verlag 2018 Materials and Corrosion 69 6 678 689 10.1002/maco.201709892 2018-04-26 OPUS4-45300 Zeitschriftenartikel Wollschläger, Nicole; Nofz, Marianne; Dörfel, Ilona; Schulz, Wencke; Sojref, Regine; Kranzmann, Axel Exposition of sol-gel alumina-coated P92 steel to flue gas: Time-resolved microstructure evolution, defect tolerance, and repairing of the coating Technically relevant P92 steel (9% Cr) was coated with a micron-thick porous alumina layer prepared by sol-gel technique and treated with flue gas (60 CO2-30 H2O-2 O2-1 SO2-7 N2 (mole fraction in %)) at 650 ° to mimic an oxyfuelcombustion process. Local defects in the coating were marked using focused ion beam (FIB) technique and were inspected after exposition to hot flue gas atmosphere at 300, 800, and 1300 h, respectively. Local defects like agglomerated alumina sol particles tend to spall off from the coating uncovering the underlying dense chromia scale. Re-coating was found to restore the protection ability from oxidation when repeatedly treated with hot flue gas. Cracks and voids did not promote the local oxidation due to the formation of crystalline Mn/S/O species within and on top of the coating. The protective character of the steel-coating system is a result of (i) the fast formation of a dense chromia scale at the surface of sol-gel alumina-coated P92 steel bars in combination with (ii) the porous alumina coating acting as diffusion barrier, but also as diffusion partner in addition with (iii) fast Mn outward diffusion capturing the S species from flue gas. Weinheim Wiley-VCH Verlag GmbH&Co. KGaA 2018 Materials and Corrosion 69 4 492 502 10.1002/maco.201709712 2018-06-26 OPUS4-44472 Zeitschriftenartikel Nofz, Marianne; Dörfel, Ilona; Sojref, Regine; Wollschläger, Nicole; Mosquera Feijoo, Maria; Schulz, Wencke; Kranzmann, Axel Thin Sol-Gel Alumina Coating as Protection of a 9% Cr Steel Against Flue Gas Corrosion at 650 °C Samples of sol-gel alumina coated and uncoated P92 steel were exposed to flue gas at 650 °C for 300 h. As result of this treatment a 50 µm thick bi-layered oxide scale had formed on the surface of the uncoated sample. Below the scale a 40 µm thick inner oxidation zone was detected. In contrast, the porous, micron thick alumina coating enabled the formation of a chromium oxide scale with a thickness of some nanometers at the interface between steel substrate and coating. In this case high temperature corrosion of the steel was prevented so far. Springer 2018 Oxidation of Metals 89 3-4 453 470 10.1007/s11085-017-9799-0 2018-03-15 OPUS4-44707 Zeitschriftenartikel Nützmann, Kathrin; Kranzmann, Axel; Stephan-Scherb, Christiane The influence of chromium on early high temperature corrosion of ferritic alloys under SO₂ atmosphere Comprehensive insights into the early stages of corrosion mechanisms provide fundamental knowledge to further understand and model long time material behaviour. The present work studies the early stages of combined oxidation and sulphidation of ferritic model alloys for time scales up to 250 h at 650 °C to observe the influence of chromium during the corrosion under SO2. Model alloys were used to focus on the reaction of the intended elements: Fe, Cr, S, and O. Pure iron simultaneously forms magnetite and iron sulphide in an early stage of corrosion, covered by a pure oxide layer after 100 h. Iron with 13 wt% Cr shows hematite and mixed Fe-Cr-oxides first, before sulphides nucleate in the inner corrosion zone. With increasing ageing time a magnetite layer is observed below the hematite layer. Quantitative phase fractions of all corrosion products observed were determined from cross section images. Characterization of the Fe13Cr corrosion scale by FIB revealed a highly porous structure in the inner corrosion zone where Cr-rich (Fe, Cr)-sulphides are present, and caused the scale to spall easily. Taylor & Francis 2018 Materials at High Temperatures 36 6 558 568 10.1080/09603409.2018.1446705 2018-04-18 OPUS4-45627 Posterpräsentation Koclęga, Damian; Radziszewska, A.; Kranzmann, Axel; Dymek, S. Microstructure characterization of the Inconel 686 clad layer after high-temperature corrosion tests in aggressive gases and ashes The Ni-Cr-Mo-W alloy is characterized by the excellent high-temperature corrosion resistance, good strength and ability to work in aggressive environments. To protect the surface of the substrate 13CrMo4-5 steel against aggressive environments the Inconel 686 as clad layer was used. The corrosion process was performed in oxidizing mixture of gases like O2, COx, SOx. The second part of corrosion Experiment concerned the corrosion test of the coating in reducing atmosphere of the specified gases with ashes, which contained e.g. Na, Cl, Ca, Si, C, Fe, Al. 2018 Junior EUROMAT 2018 Budapest, Hungary 08.07.2018 12.07.2018 2018-08-02 OPUS4-44917 Beitrag zu einem Tagungsband Le, Quynh Hoa; Bäßler, Ralph; Kratzig, Andreas; Bettge, Dirk; Kranzmann, Axel; Knauer, S. Droplet corrosion of CO2 transport pipeline steels In this work, the focus was set on the corrosion process of condensate as drops on the surface of carbon steels (X52, X70), martensitic steel UNS S41500, and superaustenite UNS N08031 in CO2 atmosphere with impurities at 278 K (to simulate the transportation condition in a buried pipeline). Exposure tests were performed at both normal pressure and high pressure where CO2 is supercritical or in dense phase. The drop, 1 ‑ 10 μL in volume, was prepared by dropping CO2 saturated ultra-pure water onto the surface of steel coupons in a one-liter-autoclave. The CO2 gas stream, simulating the oxyfuel flue gas with varying concentration of impurities (SO2 and O2 ), was then pumped into the autoclave to observe the condensation and corrosion impacts of impurities. Comparable exposure tests were carried out with the same gas mixture and the same volume of water as vapor to observe the drop formation and the corrosion process that follows. The wettability and stability of drops on the surface of steel coupons in CO2 supercritical/dense phase environment was evaluated additionally by contact angle measurement. Houston Omnipress NACE International 2018 Conference Proceedings NACE International Corrosion Conference 2018 NACE International Annual Corrosion Conference Phoenix, AZ, USA 15.04.2018 19.04.2018 10845, 1 11 2018-05-17 OPUS4-44798 Beitrag zu einem Tagungsband Le, Quynh Hoa; Bäßler, Ralph; Knauer, S; Kratzig, Andreas; Bettge, Dirk; Kranzmann, Axel Droplet corrosion of CO2 transport pipeline steels This work examined the droplet corrosion of CO2 pipeline steels caused by impurities in CO2 supercritical/dense phase at 278 K, simulating the underground transport condition. The wetting properties of carbon steels (X52 and X70) as well as martensitic steel UNS S41500, and superaustenite UNS N08031 were studied by contact angle measurement, revealing reactive wetting behavior of carbon steels. Exposure tests with CO2 saturated water droplet on steel surface showed that the impurities (220 ppmv SO2 and 6700 ppmv O2) diffused into the droplet and then reacted with metal coupons in supercritical/dense phase condition, forming the corrosion product instantly during pumping process. Due to the active wetting behavior, the carbon steels suffered from heavily attack, while negligible corrosion product was observed in cases of martensitic steel UNS S41500 and superaustenite UNS 08031 coupons. Condensation experiments that were carried out on fresh polished coupons in CO2 with 1200 ppmv H2O showed that the formation and aggregation of droplet is dependent on the presence of impurities. Without SO2 and O2, the same concentration of H2O did not cause observable corrosion process after a week of exposure. With 220 ppmv SO2 and 6700 ppmv O2 even low water concentration (5-30 ppmv) still resulted in heterogeneous nucleation and subsequent growth of droplets, leading to corrosive process on carbon steel surface albeit to a lesser extent. Houston, Texas, USA NACE International Publications Division NACE International 2018 CORROSION 2018 CORROSION 2018 Phoenix, AZ, USA 15.04.2018 19.04.2018 Paper 10845, 1 11 2018-04-26 OPUS4-44800 Zeitschriftenartikel Eh Hovsepian, P.; Ehiasarian, A. P.; Purandare, Y. P.; Mayr, P.; Abstoss, K. G.; Mosquera Feijoo, Maria; Schulz, Wencke; Kranzmann, Axel; Lasanta, M. I.; Trujillo, J. P. Novel HIPIMS deposited nanostructured CrN/NbN coatings for environmental protection of steam turbine components To increase efficiency, modern steam plants are pushing their operational regime from super-critical (600 °C/300 bar) to ultra-super-critical (740/760 °C/350 bar) stretching existing turbine materials to their limits. The focus is on new generation functional materials and technologies which complement the inherent properties of existing materials. Current work proposes a novel High Power Impulse Magnetron Sputtering (HIPIMS) Deposition technology, for the first time, for deposition of a ceramic based CrN/NbN coating with a nanoscale multilayer structure (bi-layer thickness Δ = 1.9 nm) with superior adhesion (LC2 = 80 N) to protect low Chromium P92 steel widely used in steam power plants. Thermodynamic calculations predict the equilibrium phases and aggressive gaseous compounds generated by the interaction of steam with the coating. CrN/NbN coated P92 steel samples oxidised at 600 °C in a high pressure (50 bar) 100% steam atmosphere for up to 1000 h reveal the coating's superior oxidation resistance and protective mechanisms, especially against the detrimental effect of Hydrogen. High temperature (650 °C) Tensile Strength, Low Cycle Fatigue and Creep tests confirm that, unlike other state-of-the-art PVD technologies, HIPIMS is not detrimental to the mechanical properties of the substrate material. Water droplet erosion tests confirm no measurable weight loss after 2.4 X 10⁶ impacts. Elsevier 2018 Journal of Alloys and Compounds 746 583 593 10.1016/j.jallcom.2018.02.312 2018-04-27 OPUS4-45090 Zeitschriftenartikel Nützmann, Kathrin; Wollschläger, Nicole; Rockenhäuser, Christian; Kranzmann, Axel; Stephan-Scherb, Christiane Identification and 3D reconstruction of Cr5S6 precipitates along grain boundaries in Fe13Cr Metal sulfide grain boundary precipitates of a ferrous model alloy with 13 wt.% chromium formed at 650°C under a gas atmosphere containing 0.5% SO2 and 99.5% Ar were investigated after ageing for 3 h, 6 h, and 12 h. The precipitates formed along grain boundaries were identified as Cr5S6 using energy-dispersive x-ray spectroscopy in transmission electron microscopy and electron backscatter diffraction analysis. Serial focused ion beam slicing was conducted followed by three-dimensional reconstruction to determine the number, size, and penetration depth of the precipitates evolved at the different time steps. There was a linear increase in the number of precipitates with time, while their average size increased only for the initial aging time but became constant after 6 h. Based on these results, a model for grain boundary sulfidation of ferritic alloys is discussed. New York, NY Springer Science + Business Media The Minerals, Metals & Materials Society 2018 JOM 70 8 1478 1483 10.1007/s11837-018-2940-y 2018-06-04 OPUS4-50363 Beitrag zu einem Tagungsband Pfennig, A.; Simkin, Roman; Kranzmann, Axel Construction of an adiabatic calorimeter for investigation of high tempertarue salt - based phase change material The commercial usage of latent thermal energy storages primarily depends on the development of a suitable phase change material (PCM). For industrial high temperature applications above 400 °C multicomponent chloride eutectics are promising and therefore discussed seriously. The profound thermodynamic investigation of such eutectics requires a much greater amount of specimen material than conventional calorimeter can handle. Therefore, a special adiabatic calorimeter was developed and designed. With a specimen mass of > 100 g the typical thermodynamic measurements with a commercial calorimeter can be extended by cycle stability measurements, which are often decisive for practical application of PCM. Furthermore, by implementing corrosion specimens inside the calorimeter high temperature corrosion experiments according to ISO 21608 can be performed inside the calorimeter. Adiabatic measuring conditions can be provided by using two separate heating systems. Therefore, the outer "protective system" follows the temperature curve of the inner "measuring system" minimizing the temperature difference between the heating systems and simultaneously preventing heat losses from the measuring systems. 2018 International Proceedings of Chemical, Biological and Environmental Engineering 103 10th International Conference on Chemical, Biological and Environmental Engineering ICBEE 2018 Berlin, Germany 27.09.2018 29.09.2018 21 28 10.7763/IPCBEE.2018.V103.6 2020-02-12 OPUS4-50364 Beitrag zu einem Tagungsband Pfennig, A.; Wolf, M.; Kranzmann, Axel In-situ testing of corrosion and corrosion fatigue behavior of stainless steels in geothermal environment In CCS environment (carbon capture and storage) pipes are loaded statically and/or cyclically and at the same time exposed constantly to the highly corrosive hot thermal water. Experimental procedures such as ambient pressure immersions tests, in-situ corrosion fatigue experiments using a flexibly designed corrosion chamber at ambient pressure and a specially designed corrosion chamber at high pressure. Experimental set-ups for push/pull and rotation bending load are introduced. The corrosion behavior and lifetime reduction of high alloyed steels (X46Cr13, 1.4043), (X5CrNiCuNb16-4, 1.4542) and (X2CrNiMoN22-5-3, 1.4462) is demonstrated (T=60 °C, geothermal brine: Stuttgart Aquifer flow rate: 9 l/h, CO2 ). 2018 International Proceedings of Chemical, Biological and Environmental Engineering IPCBEE 103 10th International Conference on Chemical, Biological and Environmental Engineering ICBEE 2018 Berlin, Germany 27.09.2018 29.09.2018 13 20 10.7763/IPCBEE.2018.V103.5 2020-02-12 OPUS4-50378 Zeitschriftenartikel Pfennig, A.; Kranzmann, Axel Degradation of AISI 630 exposed to CO2-saturated saline aquifer at ambient pressure and 100 bar In general high alloyed steels are suitable as pipe steels for carbon capture and storage technology (CCS), because they provide sufficient resistance against the corrosive environment of CO2-saturated saline aquifer which serves as potential CCS-site in Germany. High alloyed martensitic steel AISI 630 has been proven to be sufficient resistant in corrosive environments, e.g. regarding heat, pressure, salinity of the aquifer, CO2-partial pressure), but reveals a distinct corrosion pattern in CCS environment. Therefore coupons of AISI 630 heat treated using usual protocols were kept at T=60 °C and ambient pressure as well as p=100 bar up to 8000 h in an a) water saturated supercritical CO2 and b) CO2-saturated synthetic aquifer environment similar to on-shore CCS-sites in the Northern German Basin. AISI 630 precipitates a discontinuous ellipsoidal corrosion layer after being exposed for more than 4000 hours. Best corrosion resistance in the CO2-saturated synthetic aquifer environment phase is achieved via normalizing prior to exposure. In water saturated supercritical CO2 tempering at medium temperatures after hardening gives lowest corrosion rates. Corrosion fatigue via push-pull tests with a series of 30 specimens was evaluated at stress amplitudes between 150 MPa and 500 MPa (sinusoidal dynamic test loads, R=-1; resonant frequency ~ 30 Hz). The endurance limit of AISI 630 is reduced by more than 50% when exposed to CCS environment (maximum number of cycles (10 x 106) at a stress amplitude of 150 MPa). Faisalabad INSInet Publications 2018 Journal of applied sciences research 11 17 urn:nbn:de:kobv:b43-503783 10.22587/jasr.2018.14.6.3 https://creativecommons.org/licenses/by-sa/4.0/deed.de 2020-02-12 OPUS4-49660 Beitrag zu einem Tagungsband Koclega, Damian; Radziszewska, A.; Kranzmann, Axel; Marynowski, P.; Wozny, K. Morphology and chemical composition of inconel 686 after high-temperature corrosion The work presents the microstructure, chemical composition and mechanical properties of Inconel 686 coatings after high - temperature corrosion in environment of aggressive gases and ashes. To produce the Ni - based coatings the QS Nd:YAG laser cladding process was carried out. As the substrate used 13CrMo4-5 boilers plate steel. Ni - base alloys characterize the excellent high-temperature corrosion resistance, good strength and ability to work in aggressive environments. Formed clad were characterized by high quality of metallurgical bonding with the substrate material and sufficiently low amount of the iron close to the clad layer surface. After corrosion experiment the oxide scale on the substrate and clad created. The scale on 13CrMo4-5 steel had 70 μm thickness while the scale of the clad had less than 10 μm. The microstructure, chemical composition of the obtained clad and scales were investigated by scanning electron microscope (SEM) and electron probe microanalyzer (EPMA) equipped with the EDS detectors. 2018 METAL 2018 27th International conference on metallurgy and materials Brno, Czech Republic 23.05.2018 1010 1016 2019-11-21 OPUS4-46589 Beitrag zu einem Tagungsband Pfennig, Anja; Kranzmann, Axel Impact of saline aquifer water on surface and shallow pit corrosion of martensitic stainless steels during exposure to CO2 environment (CCS) Pipe steels suitable for carbon capture and storage technology (CCS) require resistance against the corrosive environment of a potential CCS-site, e.g. heat, pressure, salinity of the aquifer, CO2-partial pressure. Samples of different mild and high alloyed stainless injection-pipe steels partially heat treated: 42CrMo4, X20Cr13, X46Cr13, X35CrMo4 as well as X5CrNiCuNb16-4 were kept at T=60 °C and ambient pressure as well as p=100 bar for 700 h - 8000 h in a CO2-saturated synthetic aquifer environment similar to possible geological on-shore CCS-sites in the northern German Basin. Main corrosion products are FeCO3 and FeOOH. Corrosion rates obtained at 100 bar are generally much lower than those measured at ambient pressure. Highest surface corrosion rates are 0.8 mm/year for 42CrMo4 and lowest 0.01 mm/year for X5CrNiCuNb16-4 in the vapour phase at ambient pressure. At 100 bar the highest corrosion rates are 0.01 mm/year for 42CrMo4, X20Cr13 (liquid phase), X46Cr13 and less than 0.01 mm/year for X35CrMo4 and X5CrNiCuNb16-4 after 8000 h of exposure with no regard to atmosphere. Martensitic microstructure offers good corrosion resistance. IOP Publ. 2018 IOP Conference Series: Earth and Environmental Science 150 8th International Conference on Future Environment and Energy (ICFEE 2018) Phuket, Thailand 10.01.2018 81 90 urn:nbn:de:kobv:b43-465896 10.1088/1755-1315/150/1/012012 http://creativecommons.org/licenses/by/3.0/de/deed.de 2018-11-19 OPUS4-46590 Beitrag zu einem Tagungsband Koclega, Damian; Radziszewska, A.; Kranzmann, Axel The influence of the aggressive environments on the Inconel 686 coating in high-temperature corrosion experiments This work presents the microstructure and chemical composition of oxide scales created on Ni - base coating after corrosion experiments in aggressive gases and ashes. The Inconel 686 coating applied on the low carbon steel 13CrMo4-5 was performed by a CO2 laser cladding process. The experiments were carried out in oxidizing gas atmospheres containing O2, COx, SOx. The second Variation of corrosion experiments were performed in a reducing atmosphere with ashes containing elements such as: Na, Cl, Ca, Si, C, Fe, Al etc. After 240 h and 1.000 h corrosion experiments the oxide scales on the substrate and overlay were created in both cases. The sulfur compounds were found on the top of the coating surface (EPMA) and also higher contents of silica compounds were revealed on specimens covered by ashes during the experiments. The microstructure and chemical composition of the clad and scales were investigated by means of a light microscope and an electron microscope (SEM)equipped with an EDS detector. 2018 50 Jahre Kraftwerkstechnisches Kolloquium 50. Kraftwerkstechnisches Kolloquium Dresden, Germany 23.10.2018 24.10.2018 599 2018-11-29 OPUS4-46627 Zeitschriftenartikel Pfennig, Anja; Kranzmann, Axel Local Corrosion of Martensitic Stainless Steels during Exposure to Saline Aquifer Water and CO2 Environment Carbon Capture and Storage (CCS) is well acknowledged to mitigate climate change. Therefore, pipe Steels suitable for CCS technology require resistance against the corrosive environment of a potential CCS-site, e.g. heat, pressure, salinity of the aquifer, CO2-partial pressure. Samples of different mild and high alloyed stainless injection-pipe Steels partially heat treated: 42CrMo4, X20Cr13, X46Cr13, X35CrMo4 as well as X5CrNiCuNb16-4 were kept at T=60 °C and ambient pressure as well as p=100 bar for 700 h - 8000 h in a CO2-saturated synthetic aquifer environment similar to possible geological on-shore CCS-sites in the northern German Basin. Main corrosion products analysed on pits are FeCO3 and FeOOH. The carbon content does not show significant influence on the pitting behaviour. Generally, higher chromium Content results in better corrosion resistance. Although X35CrMo17-1 and X5CrNiCuNb16-4 show low surface corrosion rates, their resistance against local corrosion in CCS environment is not significantly better compared to the much less costly Steels X20Cr13 and X46Cr13. Singapore International Association of Computer Science and Information Technology Press 2018 International journal of chemical engineering and applications : IJCEA 9 26 31 10.18178/ijcea.2018.9.1.694 2018-11-19 OPUS4-47393 Vortrag Koclega, Damian; Radziszewska, Agnieszka; Kranzmann, Axel; Dymek, Stanislaw The microstructure characterization of the oxide scale created on Inconel 686 clad The Ni-Cr-Mo-W alloy is characterized by the excellent high-temperature corrosion resistance, good strength and ability to work in aggressive environments. To protect the surface of the substrate 13CrMo4-5 steel against aggressive environments the Inconel 686 as clad layer was used. The corrosion process was performed in oxidizing mixture of gases like O2, COx, SOx. The second part of corrosion Experiment concerned the corrosion test of the coating in reducing atmosphere of the specified gases with ashes, which contained e.g. Na, Cl, Ca, Si, C, Fe, Al. 2018 EUROCORR 2018 Crocow, Poland 09.09.2018 2019-02-19 OPUS4-46903 Zeitschriftenartikel Le, Quynh Hoa; Bäßler, Ralph; Knauer, S; Jaeger, P; Kratzig, Andreas; Bettge, Dirk; Kranzmann, Axel Droplet corrosion of CO2 transport pipeline steels in simulated oxyfuel flue gas The research focus of this study was set on the corrosion process of condensate as droplets on the surface of carbon steels (X52, X70) martensitic steel UNS S41500, and super austenite UNS N08031 in CO2 atmosphere with impurities at 278 K (to simulate the offshore transportation condition in a buried pipeline). The possibility of dew/droplet formation on the steel surface and wetting behavior of corresponding materials were evaluated by contact angle measurement in dense CO2 at 278 K. To observe the effect of impurities (SO2 and O2) on droplet corrosion process, exposure tests were carried out in the mixed atmosphere with a drop, 1 ‑ 10 µL in volume, of CO2 saturated ultra-pure water on steel surface. Comparable exposure tests were carried out with the same gas mixture and the same volume of water, as vapor, to observe the droplet formation and the corrosion process that follows. Effects of surface roughness on the droplet formation and its corrosion process were further studied and showed no significant role upon long time exposure. The results from droplet experiments were compared to those from the bulk electrolyte for the further recommendation on the quality control of gas stream along with the use of carbon steels as transport pipelines in CCS - Carbon Capture and Storage system. Houston, Texas, USA NACE International NACE International 2018 CORROSION 74 12 1406 1420 10.5006/2927 2018-12-06 OPUS4-46291 Beitrag zu einem Tagungsband Le, Quynh Hoa; Bäßler, Ralph; Peetz, Christoph; Buggisch, Enrico; Bettge, Dirk; Kranzmann, Axel Electrochemical study on wellbore constellations for CO2 injection Carbon Capture and Storage (CCS) is identified as an excellent technology to reach the target of CO2 reduction. However, the safety issue and cost effectiveness hinder the future of CCS. For the reliability and safety issues of injection wells the corrosion resistance of the materials used needs to be determined. In this study, representative low cost materials including carbon steel 1.8977 and low alloyed steel 1.7225 were embedded in cement to mimic the realistic casing-cement interface. Electrochemical studies were carried out using these metal-cement specimens in comparison with those made of metal only in CO2 saturated synthetic aquifer fluid, at 333 K, to reveal the effect of cement on the steel performance. The results showed the protective effect of cement on the performance of pipeline metals during polarisation process. However, the corrosion current density was high in all cases, with and without cement, indicating that the corrosion resistance of these materials is low. This conclusion was supported by the surface analysis of the polarized specimens, which revealed both homogenous and pitting corrosions. Krakau, Poland EFC EFC 2018 EUROCORR 2018 EUROCORR 2018 Krakow, Poland 09.09.2018 13.09.2018 1 4 2018-10-16