TY - CONF A1 - Bäßler, Ralph A1 - Sarmiento Klapper, Helmuth A1 - Feigl, Michael A1 - Hilker, Nico T1 - Corrosion resistance of high-alloyed and alternative materials in an artificial geothermal water N2 - Many technologies have been developed to take advantage of geothermal energy, which became a feasible energy source to replace fossil fuel supply. Nevertheless, service conditions in geothermal facilities are due to the chemical composition of hydrothermal fluids and involved high temperatures, in many cases, extreme in terms of corrosion. Therefore, materials selection based on preliminary material qualification is essential to guarantee a secure and reliable operation of the facilities. This contribution deals with the evaluation of the corrosion behavior of two high-alloyed metallic materials and α-Al2O3 in an artificial geothermal fluid simulating the conditions in the Northern German Basin, a location with high geothermal potential. The suitability of the super austenitic stainless steel UNS N08031 and the nickel base alloy UNS N06059 in this geothermal fluid obtained by electrochemical measurements and exposure tests is addressed. As an alternative to the suitable but costly UNS N06059 that showed excellent corrosion resistance against pitting corrosion, ceramic made of α-Al2O3 represents an interesting possibility for selected components to be used in the construction of geothermal facilities T2 - Corrosion 2014 CY - San Antonio, TX, USA DA - 09.03.2014 KW - Localized corrosion KW - Stainless steel KW - Ni-based alloy KW - Ceramic KW - Geothermal energy PY - 2014 SP - Paper 3826, 1 EP - 8 AN - OPUS4-30632 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bäßler, Ralph A1 - Sarmiento Klapper, Helmuth A1 - Feigl, Michael A1 - Hilker, Nico T1 - Suitability of high-alloyed or alternative non-metallic materials in high saline artificial geothermal waters N2 - Many technologies have been developed to take advantage of geothermal energy, which became a feasible energy source to replace fossil fliel supply. Nevertheless, Service conditions in geothermal facilities are due to the Chemical composition of hydrothermal fluids and involved high temperatures, in many cases, extreme in terms of corrosion. Therefore, materials selection based on preliminary material qualification is essential to guarantee a secure and reliable Operation ofthe facilities. This contribution deals with the evaluation of the corrosion behavior of two high-alloyed metallic materials and a-A1203 in an artificial geothermal fluid simulating the conditions in the Northern German Basin, a location with high geothermal potential. The suitability of the super austenitic stainless Steel, alloy 31, and the nickel base alloy 59 in this geothermal fluid obtained by electrochemical measurements and exposure tests is addressed. As an alternative to the suitable but costly alloy 59 that showed excelient corrosion resistance against pitting corrosion, ceramic made of a-A1203 represents an interesting possibility for selected components to be used in the construction of geothermal facilities. T2 - Corrosion-2014 - XIIth International conference "Problems of corrosion and corrosion protection of structural materials" CY - Lviv, Ukraine DA - 11.06.2014 KW - Localized corrosion KW - Steel KW - Ni-alloy KW - Ceramic KW - Geothermal energy PY - 2014 SP - 18 EP - 22 AN - OPUS4-32743 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Feigl, Michael T1 - Better sol-gel coatings through improved substrate wetting T2 - Tagung "Materials Science and Engineering" CY - Nuremberg, Germany DA - 2008-09-01 PY - 2008 AN - OPUS4-17652 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Feigl, Michael T1 - Improving alumo sol wetting properties for easier coating applications T2 - Junior-Euromat 2008 CY - Lausanne, Switzerland DA - 2008-07-14 PY - 2008 AN - OPUS4-17266 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Feigl, Michael T1 - Influence of Different atmospheres on the high Temperature corrosion Protection abilities of Alumina Coatings on alloys T2 - Eurocorr 2009 The European Corrosion Congress CY - Nice, France DA - 2009-09-06 PY - 2009 AN - OPUS4-18969 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nofz, Marianne A1 - Sojref, Regine A1 - Feigl, Michael A1 - Dreßler, Martin A1 - Dörfel, Ilona T1 - Sol-Gel-Aluminiumoxidschichten für den Oxidationsschutz von Hochtemperaturlegierungen, Teil 2 KW - Alumosol KW - Sol-Gel-Verfahren KW - Beschichtung KW - Oxidationsschutz PY - 2009 SN - 0023-0561 VL - 61 IS - 5 SP - 272 EP - 277 PB - DVS-Verl. CY - Düsseldorf AN - OPUS4-20263 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nofz, Marianne A1 - Sojref, Regine A1 - Feigl, Michael A1 - Dreßler, Martin A1 - Dörfel, Ilona T1 - Sol-Gel-Aluminiumoxidschichten für den Oxidationsschutz von Hochtemperaturlegierungen, Teil 1 KW - Alumosol KW - Sol-Gel-Verfahren KW - Beschichtung KW - Oxidationsschutz PY - 2009 SN - 0023-0561 VL - 61 IS - 2-3 SP - 82 EP - 86 PB - DVS-Verl. CY - Düsseldorf AN - OPUS4-20264 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Feigl, Michael A1 - Nofz, Marianne A1 - Sojref, Regine A1 - Kohl, Anka T1 - Improved wetting of bare and pre-coated steels by aqueous alumina sols for optimum coating success N2 - Alumina coatings are a promising candidate for the protection of metals prone to high temperature corrosion. If applied via sol–gel process, especially by using so called aqueous modified Yoldas-sols, the deposition is hardened by differences in surface free energy of substrate and sol. In this paper the apparent surface properties of samples to be coated and sols were examined by contact angle measurements, IR-spectroscopy and tensiometry. The results imply, after consideration of possible uncertainties, the use of surface tension reducing 2-butanol already present during hydrolysis of the sols to obtain an easy and successful coating process. KW - Sol-gel KW - Wetting KW - Coating KW - IR-spectroscopy PY - 2010 DO - https://doi.org/10.1007/s10971-010-2232-7 SN - 0928-0707 SN - 1573-4846 VL - 55 IS - 2 SP - 191 EP - 198 PB - Kluwer Academic Publ. CY - Dordrecht AN - OPUS4-22602 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Feigl, Michael T1 - Electrochemical evaluation of corrosion behaviour of sol-gel alumina coated steel AlSl304 and Ni-base alloy Inconel-718 T2 - Eurocorr 2011 CY - Stockholm, Sweden DA - 05.09.2011 PY - 2011 AN - OPUS4-24870 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schulz, Wencke A1 - Feigl, Michael A1 - Dörfel, Ilona A1 - Nofz, Marianne A1 - Kranzmann, Axel T1 - Influence of a sol-gel alumina coating on oxidation of X20CrMoV12-1 in air up to 650 °C N2 - The need for a more efficient coal power plant generation (e.g. oxyfuel technology) results in modified process parameters and enhanced corrosion. To reach the necessary service life of high temperature parts protective coatings may be a sufficient technical solution. A modified Yoldas sol (Al2O3 based) was used to coat X20CrMoV12-1 by spin coating. After appropriate heat treatments transition alumina coatings being about 400 nm thick were obtained. Oxidation studies were carried out in laboratory air at temperatures up to 650 °C for up to 500 h exposure time. In case of the uncoated sample a rough oxide layer formed on the surface and a remarkable weight gain (2.62 mg/cm²) were detected. The sol–gel alumina layer (mainly δ-Al2O3) demonstrated a high protection, i.e. a very low weight gain (0.05 mg/cm²). Diffusion of alloying elements into the coating was observed. No indication of spallation of the coating occurred. Local defects (2 µm–30 µm) in the coating led to the formation of iron-oxide islands. KW - X20CrMoV12-1 KW - Sol-gel deposition KW - Alumina KW - Air oxidation KW - Transmission electron microscopy KW - Chromium KW - Diffusion KW - Manganese PY - 2013 DO - https://doi.org/10.1016/j.tsf.2013.04.132 SN - 0040-6090 VL - 539 SP - 29 EP - 34 PB - Elsevier B.V. CY - Amsterdam AN - OPUS4-29162 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -