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 OPUS4-54854 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 OPUS4-54482 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 OPUS4-54301 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 OPUS4-52555 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