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 OPUS4-55113 Vortrag Babutzka, Martin New findings on the formation of corrosion product layers on zinc in the atmosphere The presentation shows systematic investigations to describe the corrosion and corrosion product formation processes of pure zinc under the climatic conditions currently prevailing in the Federal Republic of Germany. The investigations in their entirety aim at questioning current and establishing new ways of looking at the formation of corrosion products of pure zinc under atmospheric corrosion conditions. Thus, they make a significant contribution in understanding corrosion protection by zinc and zinc coatings. In particular, the focus is placed on the initial stage of the corrosion product formation. A systematic investigation of this time range, which is characterized by very reactive corrosion products, is only made possible by using gel-type electrolytes. The short periods of time at the beginning of weathering is now measurable and their influence on the formation of corrosion products and the kinetics of layer formation describable. By combining the new electrochemical approach with gravimetric, microscopic and analytical methods, new insights could be gained both on a methodic and scientific level. 2022 26th International Galvanizing Conference and Exhibition Rome, Italy 20.06.2022 24.06.2022 2022-06-27 OPUS4-55075 Zeitschriftenartikel Kromer, Ch.; Schwibbert, K.; Gadicherla, A. K.; Thiele, D.; Nirmalananthan-Budau, Nithiya; Laux, P.; Resch-Genger, Ute; Luch, A.; Tschiche, H. R. Monitoring and imaging pH in biofilms utilizing a fluorescent polymeric nanosensor Biofilms are ubiquitous in nature and in the man-made environment. Given their harmful effects on human health, an in-depth understanding of biofilms and the monitoring of their formation and growth are important. Particularly relevant for many metabolic processes and survival strategies of biofilms is their extracellular pH. However, most conventional techniques are not suited for minimally invasive pH measurements of living biofilms. Here, a fluorescent nanosensor is presented for ratiometric measurements of pH in biofilms in the range of pH 4.5-9.5 using confocal laser scanning microscopy. The nanosensor consists of biocompatible polystyrene nanoparticles loaded with pH-inert dye Nile Red and is surface functionalized with a pH-responsive fluorescein dye. Its performance was validated by fluorometrically monitoring the time-dependent changes in pH in E. coli biofilms after glucose inoculation at 37 °C and 4 °C. This revealed a temperature-dependent decrease in pH over a 4-h period caused by the acidifying glucose metabolism of E. coli. These studies demonstrate the applicability of this nanosensor to characterize the chemical microenvironment in biofilms with fluorescence methods. London Nature Publishing Group 2022 Scientific reports 12 1 1 10 urn:nbn:de:kobv:b43-550751 10.1038/s41598-022-13518-1 https://creativecommons.org/licenses/by/4.0/deed.de 2022-06-20 OPUS4-54854 Vortrag Bäßler, Ralph Corrosion Effects on Materials Considered for CC(U)S Applications Commercially available carbon steels are suitable for compression and pipelines as long as moisture content and impurities are limited. (water 50 to 100 ppmv, SO2 and NO2 ca. 100 ppmv) Corrosion rates increase with increasing water content. (0.2 - 20 mm/a) Condensation of acids and therefore droplet formation is always possible, even at low water contents. A low SO2 content within the CO2-stream might be more important than a low water content. Cr13-steels showed a general susceptibility to shallow pitting and pitting. So, they seem to be not suitable for CCUS applications. Low alloyed steels showed better corrosion behavior (predictable uniform corrosion). For direct contact with saline aquifer fluids only high alloyed steels shall be used. 2022 EFC Webinar Online Meeting (Chongqing, China) 18.05.2022 2022-05-19 OPUS4-56084 Vortrag Bäßler, Ralph A Coating System for Corrosion Protection of Carbon Steel as an Alternative for High Alloyed Materials The screening of coatings shows that the modification by adding individual pigment was not sufficient to protect carbon steel even during a short-term exposure, indicated by the discoloration after only seven days of exposure. Electrochemical tests indicated that the coating cathodically protects carbon steel or slows down the corrosion reaction. A long-term exposure test confirmed that the PANI/SiO2 modified coating successfully protects the carbon steel in the Sibayak artificial geothermal water at 150 °C for 6 months. 2022 European Geothermal Congress Berlin, Germany 17.10.22 21.10.22 2022-10-25 OPUS4-56085 Beitrag zu einem Tagungsband Aristia, Gabriela; Bäßler, Ralph A Coating System for Corrosion Protection of Carbon Steel as an Alternative for High Alloyed Materials Corrosive geothermal brines are a major challenge to geothermal power-plants. For cost reasons, plant designers favorize low alloyed steels, e.g., carbon steel, which are susceptible to uniform and localized corrosion when exposed to geothermal brines having acidic and saline properties. To solve such problem, coatings or inhibitors would be a protective solution as an alternative to the use of high alloyed materials. This study investigated a coating system consisting of polyaniline/silicon dioxide basing on locally available resources. Protection against corrosion of carbon steel is shown by long-term exposure and electrochemical tests of coated carbon steels, performed in an artificial acidic and saline geothermal brine, comparable to real conditions at a site in Indonesia. Therefore, an integrated coating system is presented for corrosion protection, combining the electro-chemical functionality of polyaniline and the physical advantages of silica. Berlin European Geothermal Congress 2022 Proceedings EGC 2022 European Geothermal Congress Berlin, Germany 17.10.22 21.10.22 1 7 2022-10-26 OPUS4-56370 Vortrag Babutzka, Martin Stainless steels: Fundamentals and causes for corrosion defects The presentation gives an overview about the fundamentals on stainless steels. The mechanism of passive layer formation is explained and strategies for securing corrosion protection are given. The influence of a grinding process on corrosion resistance is discussed. 2022 Tech-Day Mettler Toledo Online meeting 23.11.2022 23.11.2022 2022-11-24 OPUS4-54570 Zeitschriftenartikel Pfennig, A.; Kranzmann, Axel Understanding the Anomalous Corrosion Behaviour of 17% Chromium Martensitic Stainless Steel in Laboratory CCS-Environment—A Descriptive Approach To mitigate carbon dioxide emissions CO2 is compressed and sequestrated into deep geological layers (Carbon Capture and Storage CCS). The corrosion of injection pipe steels is induced when the metal is in contact with CO2 and at the same time the geological saline formation water. Stainless steels X35CrMo17 and X5CrNiCuNb16-4 with approximately 17% Cr show potential as injection pipes to engineer the Northern German Basin geological onshore CCS-site. Static laboratory experiments (T = 60 ◦C, p = 100 bar, 700-8000 h exposure time, aquifer water, CO2-flow rate of 9 L/h) were conducted to evaluate corrosion kinetics. The anomalous surface corrosion phenomena were found to be independent of heat treatment prior to exposure. The corrosion process is described as a function of the atmosphere and diffusion process of ionic species to explain the precipitation mechanism and better estimate the reliability of these particular steels in a downhole CCS environment. MDPI 2022 MDPI Clean Technologies 4 2 239 257 urn:nbn:de:kobv:b43-545700 10.3390/cleantechnol4020014 https://creativecommons.org/licenses/by/4.0/deed.de 2022-03-31 OPUS4-54482 Vortrag Bäßler, Ralph Evaluation of Corrosion Resistance of Metallic Materials in Geothermal Applications Evaluation of corrosion resistance of metallic materials is essential to assure safe and reliable operation of geothermal sites. One need to be aware that corrosion is not a material's but a system property, determined by medium, material and construction aspects. Various corrosion types have to be evaluated. Conditions in laboratory shall reflect on-site reality. Depending on brine composition and temperature suitability of metallic materials can be ranked. Most important outcome of the research is that highly saline geothermal brines require high alloyed materials, for safe long-term operation. 2022 Geothermal Essentials - Moving Geothermal Forward in Canada: Scaling and Corrosion (Surface Facilities) Online Webinar 16.03.2022 2022-03-17 OPUS4-54452 Vortrag Bäßler, Ralph Integrated Coating System for Corrosion Protection of Carbon Steel in Artificial Geothermal Brine Corrosive geothermal brines are a major challenge to geothermal power-plants. For cost reasons, plant designers prefer to use carbon and low alloyed steels, which are susceptible to uniform and localized corrosion when exposed to geothermal brines having acidic and saline properties. To solve such problem, coatings or inhibitors would be a protective solution as an alternative to the use of high alloyed materials. This study investigated a coating system consisting of polyaniline/silicon dioxide based on resources locally available in Indonesia. Protection against corrosion of carbon steel was shown by long-term (28 day) exposure and electrochemical tests of coated carbon steels, performed in an artificial acidic and saline geothermal brine, comparable to the conditions encountered at a site in Indonesia. Therefore, an integrated coating system is proposed for corrosion protection, combining the electrochemical functionality of polyaniline and the physical advantages of silica. 2022 AMPP International Corrosion Conference 2022 San Antonio, TX, USA 08.03.2022 2022-03-11 OPUS4-54349 Zeitschriftenartikel Manzoni, Anna Maria; Mohring, Wencke; Hesse, René; Agudo Jácome, Leonardo; Stephan-Scherb, C. Early material damage in equimolar CrMnFeCoNi in mixed oxidizing/sulfiding hot gas atmosphere The challenges to use more varied fuels at medium and high temperatures above 500 °C need to be addressed by tuning the materials toward a better resistance against increased corrosion. As a first step the corrosion processes need to be better understood, especially in the case of the unavoidable and highly corrosive sulfur-based gases. Herein, oxidation/sulfidation of an equimolar CrMnFeCoNi high-entropy alloy is studied at an early stage after hot gas exposure at 600 °C for 6 h in 0.5% SO2 and 99.5% Ar. The oxidation process is studied by means of X-ray diffraction, scanning and transmission electron microscopy, and supported by thermodynamic calculations. It is found that the sulfur does not enter the bulk material but interacts mainly with the fast-diffusing manganese at grain boundary triple junctions at the alloy surface. Submicrometer scaled Cr-S-O-rich phases close to the grain boundaries complete the sulfur-based phase formation. The grains are covered in different Fe-, Mn-, and Cr-based spinels and other oxides. Weinheim Wiley-VCH Deutsche Gesellschaft für Materialkunde 2022 Advanced engineering materials 1 8 urn:nbn:de:kobv:b43-543495 10.1002/adem.202101573 https://creativecommons.org/licenses/by/4.0/deed.de 2022-02-16 OPUS4-54301 Zeitschriftenartikel Babutzka, Martin; Grabowski, Sven; Sahrhage, H.; Lampke, T. Electrochemical corrosion investigations on binary and ternary zinc alloy coatings using gel electrolytes Novel agar-based test electrolytes are used to perform electrochemical corrosion investigations on ZnFe and ZnNi binary as well as ZnFeMo ternary zinc coatings. The objectives of the electrochemical investigations include the characterization of the corrosion behavior, the description of the protective effect of the coatings as well as the investigation of the layer formation and degradation under artificial aging. ZnFe and ZnFeMo coatings are applied with varying iron content as well as an additional passivation layer, respectively, to study the effect on corrosion resistance. The results show that the protective effect of the coatings is not negatively influenced by different iron contents or the addition of molybdenum. Additional passivation of the ZnFe-containing coatings by means of a passivating agent leads to a significant improvement in the protective effect. Artificial aging leads to slight degradation of the additional passivation layer whereas coatings without post-treatment enhance their protective effect by the formation of corrosion product layers. Weinheim Wiley-VCH 2022 Advanced engineering materials 1 14 urn:nbn:de:kobv:b43-543013 10.1002/adem.202101336 https://creativecommons.org/licenses/by/4.0/deed.de 2022-02-11 OPUS4-54053 Vortrag Witt, Julia In situ Atomic Force Microscopy (AFM) studies of corrosion processes on thin film coated AA2024-T3 aluminium alloy surfaces The performance of functional coatings relies strongly on the stability of the polymer-metal interface. The increasing utilization of multi-material structures in the automotive and aerospace industry necessitates a fundamental understanding of the processes leading to interface degradation for the development of novel strategies to increase corrosion and delamination resistance. The aim of this project is to investigate the corrosion processes at the buried interface of thin film coated aluminium alloy AA2024-T3 under corrosive and coupled corrosive-mechanical load. A spin coating procedure was developed to synthesize epoxy-like coatings and their nanofiller loaded composites with controlled thickness by layer-by-layer deposition of poly[(o-cresyl glycidyl ether)-co-formaldehyde] and poly-(ethylenimine) bi-layers. Our results indicate that the incorporation of graphene into the epoxy-based coatings leads to the improvement of mechanical and barrier properties. Furthermore, the functional groups play important roles in the interfacial bonding between polymer matrix and the nanofillers. Atomic force microscopy (AFM) results indicate very homogeneous and dense films with a thickness of ~25 nm per bi-layer and the successful integration of the nanofillers into the composite coatings. Ellipsometry measurements of film thickness verified a proportional film growth with the number of deposited layers. The degradation and delamination behavior of the coating systems was characterized by means of in situ AFM corrosion experiments. Complementary energy dispersive X-ray spectroscopy (EDX) analysis was used to correlate the corrosion and delamination behavior with the different intermetallic particle chemistries and distributions. The presentation will summarize our results on the effect of coating composition and build-up on the local corrosion processes on thin film covered AA2024-T3 aluminium alloys. 2021 Eurocorr 2021 Online meeting 20.09.2021 24.09.2021 2021-12-16 OPUS4-53787 Vortrag Wetzel, Annica Local corrosion properties of high/medium entropy alloys in aqueous environments High and medium entropy alloys gained increasing academic and industrial interest as novel materials for engineering applications. This project is aiming to clarify and compare the general and local corrosion properties of high entropy alloy CrMnFeCoNi and medium entropy alloy CrCoNi in different aqueous environments. The focus lies on the local corrosion processes that result either from microstructural imperfections (inclusions, defects at grain boundaries etc.) in the base material or processing related changes in the microstructure and/or local composition. The corrosion behavior of the alloys was monitored via potentiodynamic polarization experiments and the local corrosion characteristics were further investigated by means of scanning electrochemical microscopy (SECM). Their passivation behavior was analyzed in three different electrolyte systems (NaCl, H2SO4 and NaClO4; c = 0.1M). The characterization of the surface morphology and composition of the passive film was performed by means of atomic force microscopy (AFM), scanning electron microscopy coupled with energy dispersive X-Ray spectroscopy (SEM/EDX) and X-Ray photoelectron spectroscopy (XPS), respectively. Considering long term corrosion effects, electrochemical work was supported with immersion tests and the analysis of corrosion products by SEM/EDX and XPS depth-profiling. Our results indicate that the medium entropy alloy CrCoNi has a significantly higher corrosion resistance in comparison to the high entropy alloy CrMnFeCoNi. The presentation will summarize some of our results on the mechanistical aspects of the observed high corrosion resistance. 2020 EUROCORR 2020 Online meeting 07.09.2020 11.09.2020 2021-11-23 OPUS4-52555 Zeitschriftenartikel Aristia, Gabriela; Le, Quynh Hoa; Nofz, Marianne; Sojref, Regine; Bäßler, Ralph Study of Al2O3 Sol-Gel Coatings on X20Cr13 in Artificial North German Basin Geothermal Water at 150 °C Al2O3 has been widely used as a coating in industrial applications due to its excellent chemical and thermal resistance. Considering high temperatures and aggressive mediums exist in geothermal systems, Al2O3 can be a potential coating candidate to protect steels in geothermal applications. In this study, γ-Al2O3 was used as a coating on martensitic steels by applying AlOOH sol followed by a heat treatment at 600 °C. To evaluate the coating application process, one-, two-, and three-layer coatings were tested in the artificial North German Basin (NGB), containing 166 g/L Cl−, at 150 °C and 1 MPa for 168 h. To reveal the stability of the Al2O3 coating in NGB solution, three-layer coatings were used in exposure tests for 24, 168, 672, and 1296 h, followed by surface and cross-section characterization. SEM images show that the Al2O3 coating was stable up to 1296 h of exposure, where the outer layer mostly transformed into boehmite AlOOH with needle-like crystals dominating the surface. Closer analysis of cross-sections showed that the interface between each layer was affected in long-term exposure tests, which caused local delamination after 168 h of exposure. In separate experiments, electrochemical impedance spectroscopy (EIS) was performed at 150 °C to evaluate the changes of coatings within the first 24 h. Results showed that the most significant decrease in the impedance is within 6 h, which can be associated with the electrolyte penetration through the coating, followed by the formation of AlOOH. Here, results of both short-term EIS measurements (up to 24 h) and long-term exposure tests (up to 1296 h) are discussed. Basel MDPI 2021 Coatings 11 5 526 urn:nbn:de:kobv:b43-525551 10.3390/coatings11050526 https://creativecommons.org/licenses/by/4.0/deed.de 2021-05-03 OPUS4-53507 Vortrag Sankaran, Shivasarathy; Ebell, Gino Analyzing the performance of discrete galvanic anode systems using electrochemical investigations Corrosion of reinforcement is one of the major reasons in questioning the service life of building structures. The application of cathodic protection techniques plays a big role in controlling the corrosion process to ensure a longer service life of building structures. This systematic study compares the efficiency and durability of various discrete galvanic zinc anode systems available in the current market using different criteria for measuring efficiency such as potential measurements, electrolyte resistance measurements and several polarization methods to determine the polarizability of the anodes. The results to validate the performance of long-time exposure of discrete zinc anodes in concrete medium are discussed. 2021 EUROCORR 2021 Online meeting 20.09.2021 24.09.2021 2021-10-12 OPUS4-52940 Beitrag zu einem Tagungsband Rütters, H; Fischer, S; Le, Quynh Hoa; Bettge, Dirk; Bäßler, Ralph; Maßmann, J; Ostertag-Henning, C; Lennard Wolf, J; Pumpa, M; Lubenau, U; Knauer, S; Jaeger, P; Neumann, A; Svensson, K; Pöllmann, H; Lempp, C; Menezes, F; Hagemann, B Towards Defining Reasonable Minimum Composition Thresholds - Impacts of Variable CO2 Stream Compositions on Transport, Injection and Storage The collaborative project "Impacts of impurities in CO2 streams captured from different emitters in a regional cluster on transport, injection and storage (CLUSTER)" aimed to set up recommendations on how to define "reasonable minimum composition thresholds" that CO2 streams should meet when accessing CO2 transport pipeline networks. Within CLUSTER, we investigated potential impacts of CO2 streams with different and temporally variable compositions and mass flow rates along the whole CCS chain. Investigations included, amongst others, impacts on: • corrosion of pipeline steel, • pipeline network design and related transport costs, • alteration of well bore cements, • pressure development and rock integrity, • geochemical reactions, and • petrophysical and geomechanical rock properties. All investigations are based on a generic CCS chain scenario. In this scenario, CO2 streams are captured from a spatial cluster of eleven emitters and collected in a regional pipeline network. Emitters comprise seven fossil fuel-fired power plants equipped with different capture technologies, two cement plants, one refinery and one integrated iron and steel plant. In total, 19.78 Mio t CO2 (including impurities) are captured in the emitter cluster annually. The combined CO2 stream is transported in a trunk line with a length of 400 km (100 km of these offshore) and is injected into five generic storage structures. The storage reservoirs are saline aquifers of the Buntsandstein. The investigations revealed beneficial and deteriorating impacts of different impurities and combinations thereof. Overall, no fundamental technical obstacles for transporting, injecting and storing CO2 streams of the modelled variable compositions and mass flow rates were observed. Based on the results, the CLUSTER project team recommends not to define "minimum composition thresholds" for CO2 streams as strict threshold values for each individual impurity in the stream. Instead, CO2 stream compositions and variabilities for specific CCS projects should be constrained with regard to a set of parameters including i) the overall CO2 content, ii) maximum contents of relevant impurities or elements, iii) acceptable variability of CO2 stream composition, and iv) impurity combinations to be avoided. Elservier 2021 Proceedings of the 15th Greenhouse Gas Control Technologies Conference 15-18 March 2021 The 15th Greenhouse Gas Control Technologies Conference Online meeting 15.03.2021 18.03.2021 1 18 10.2139/ssrn.3816427 2021-07-12 OPUS4-52811 Zeitschriftenartikel Wurzler, Nina; Sobol, Oded; Altmann, Korinna; Radnik, Jörg; Özcan Sandikcioglu, Özlem Preconditioning of AISI 304 stainless steel surfaces in the presence of flavins—Part I: Effect on surface chemistry and corrosion behavior Stainless steel AISI 304 surfaces were studied after a mild anodic polarization for oxide growth in the presence and absence of two derivatives of vitamin B2 (riboflavin and flavin mononucleotide) that can be secreted by metal-reducing bacteria and act as a chelating agent for iron species. The alterations in oxide chemistry were studied by means of surface-sensitive techniques such as X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry analysis. The complementary electrochemical characterization revealed a preferential growth of an oxide/hydroxide iron-rich film that is responsible for an altered pit initiation and nucleation behavior. These findings suggest that as the corrosion behavior is determined by the interplay of the chemical and electronic properties, only a mild anodic polarization in the presence of redox-active molecules is able to alter the chemical and electronic structure of the passive film formed on stainless steel AISI 304. This helps to achieve a profound understanding of the mechanisms of microbially influenced corrosion (MIC) and especially the possible effects of the redox-active biomolecules, as they may play an important role in the corrosion susceptibility of stainless steel surfaces. Wiley 2021 Materials and Corrosion 72 6 974 982 urn:nbn:de:kobv:b43-528117 10.1002/maco.202012191 https://creativecommons.org/licenses/by/4.0/deed.de 2021-06-14 OPUS4-52931 Zeitschriftenartikel Aristia, Gabriela; Bäßler, Ralph; Nofz, Marianne; Sojref, Regine; Kohl, Anka Short-term exposure tests of ɣ-Al2O3 Sol-gel coating on X20Cr13 in artificial geothermal waters with different pH The suitability of an Al2O3 coating for corrosion protection on X20Cr13 was evaluated in various artificial geothermal brines, focusing on the influence of different pH (4, 6 and 8) and their chemical compositions on the coating properties. All experiments were performed in the laboratory using autoclaves at 150 ◦C and 1 MPa in deaerated condition for 1 and 7 days. Results showed that the pH of geothermal waters is the most detrimental factor in the transformation of ɣ-Al2O3 and its protective abilities. Delaminations were found in the Coating exposed to geothermal brines with pH 4. FTIR spectra indicated a transformation of ɣ-Al2O3 to boehmite AlOOH after exposure to pH 4 and 6, and bayerite Al(OH)3 was formed after exposure to pH 8. Different Crystal structures of the hydrated Al2O3 also contribute to the stability of the coatings, observed by the SEM- EDX of the surface and cross-section of coatings. This study indicated that ɣ-Al2O3 sol-gel coating presents a promising aspect of corrosion protection in geothermal environment with a neutral pH. Amsterdam Elsevier Ltd. 2021 Geothermics 96 102193 10.1016/j.geothermics.2021.102193 2021-07-08 OPUS4-53139 Zeitschriftenartikel Pfennig, Anja; Wolf, Marcus; Kranzmann, Axel Corrosion and corrosion fatigue of steels in downhole CCS environment - A summary Static immersion tests of potential injection pipe steels 42CrMo4, X20Cr13, X46Cr13, X35CrMo4, and X5CrNiCuNb16-4 at T = 60 °C and ambient pressure, as well as p = 100 bar were performed for 700-8000 h in a CO₂-saturated synthetic aquifer environment similar to CCS sites in the Northern German Basin (NGB). Corrosion rates at 100 bar are generally lower than at ambient pressure. The main corrosion products are FeCO₃ and FeOOH with surface and local corrosion phenomena directly related to the alloy composition and microstructure. The appropriate heat treatment enhances corrosion resistance. The lifetime reduction of X46Cr13, X5CrNiCuNb16-4, and duplex stainless steel X2CrNiMoN22-5-3 in a CCS environment is demonstrated in the in situ corrosion fatigue CF experiments (axial push-pull and rotation bending load, 60 °C, brine: Stuttgart Aquifer and NGB, flowing CO₂: 30 L/h, +/- applied potential). Insulating the test setup is necessary to gain reliable data. S-N plots, micrographic-, phase-, fractographic-, and surface analysis prove that the life expectancy of X2CrNiMoN22-5-3 in the axial cyclic load to failure is clearly related to the surface finish, applied stress amplitude, and stress mode. The horizontal grain attack within corrosion pit cavities, multiple fatigue cracks, and preferable deterioration of austenitic phase mainly cause fatigue failure. The CF life range increases significantly when a protective potential is applied. Basel MDPI 2021 Processes 9 4 1 33 urn:nbn:de:kobv:b43-531391 10.3390/pr9040594 https://creativecommons.org/licenses/by/4.0/deed.de 2021-08-27 OPUS4-53140 Beitrag zu einem Tagungsband Pfennig, Anja; Kranzmann, Axel Effects of saline aquifer water on the corrosion behaviour of martensitic stainless steels during exposure to CO2 environment Immersion tests of potential injection pipe steels 42CrMo4, X20Cr13, X46Cr13, X35CrMo4 and X5CrNiCuNb16-4 at T=60 °C and ambient pressure and p=100 bar were performed for 700 h - 8000 h in a CO₂-saturated synthetic aquifer environment similar to CCS-sites in the Northern-German-Basin. Main corrosion products are FeCO₃ and FeOOH. Highest surface corrosion rates at ambient pressure are 0.8 mm/year for 42CrMo4 and lowest 0.01 mm/year for X5CrNiCuNb16-4. Corrosion rates at 100 bar (max. 0.01 mm/year for 42CrMo4, X20Cr13, X46Cr13) are generally lower than at ambient pressure (<0.01 mm/year for X35CrMo4, X5CrNiCuNb16-4). Heat treatment to martensitic microstructure offers good corrosion resistance. Rochester, NY SSRN IEA Greenhouse Gas R&D Programme (IEAGHG) 2021 Proceedings of the 15th Greenhouse Gas Control Technologies Conference 15-18 March 2021 15th International Conference on Greenhouse Gas Control Technologies, GHGT-15 Abu Dhabi, United Arab Emirates 15.03.2021 18.03.2021 1 12 10.2139/ssrn.3812248 2021-08-27