TY - JOUR A1 - Valet, Svenja A1 - Bohlmann, Tatjana A1 - Burkert, Andreas A1 - Ebell, Gino T1 - Zinc acetate containing gel pads for electrochemical measurements of Zn samples JF - Journal of Electroanalytical Chemistry N2 - Agar gel pads have been used for electrochemical measurements for some time. For zinc in particular, a standard method for measuring the stability of the corrosion product layer is being established. The main interpretation factor is the corrosion product layer resistance RL, as it is easy to determine and interpret. A high corrosion product layer resistance indicates a high level of protection. However, it is not yet known how low the corrosion product layer resistance is for freshly produced zinc samples. As zinc is highly active, it reacts immediately with the environment to form a corrosion product layer, which affects the corrosion product layer resistance. The addition of zinc acetate to the agar gel pads prevents the formation of a surface layer and destroys existing ones. This makes it possible to measure an almost corrosion product-free zinc surface. This is important in defining the range of corrosion product layer resistance for a protective surface. KW - Electrochemistry KW - General Chemical Engineering KW - Analytical Chemistry KW - Corrosion KW - Zinc KW - Korrosion PY - 2023 DO - https://doi.org/10.1016/j.jelechem.2023.117814 SN - 1572-6657 VL - 948 SP - 1 EP - 8 PB - Elsevier B.V. AN - OPUS4-59079 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Sarmiento Klapper, Helmuth A1 - Bäßler, Ralph A1 - Burkert, Andreas T1 - Recent progress in the qualification of materials used in geothermal energy conversion systems T2 - 1st International conference on materials for energy T2 - 1st International conference on materials for energy CY - Karlsruhe, Germany DA - 2010-07-04 KW - Korrosion KW - Geothermie KW - CrNi-Stahl KW - Ni-Basislegierung KW - Duplexstahl PY - 2010 SN - 978-3-89746-117-8 SP - 158 EP - 159 AN - OPUS4-21676 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ebell, Gino A1 - Burkert, Andreas A1 - Mietz, Jürgen T1 - Detection of reinforcement corrosion in reinforced concrete structures by potential mapping: Theory and practice JF - International Journal of Corrosion N2 - Electrochemical potential mapping according to guideline B3 of DGZfP (German Society for Nondestructive Testing) is a recognized technique for the localization of corroding reinforcing steels. In reinforced concrete structures the measured potentials are not necessarily directly linked to the corrosion likelihood of the reinforcing steel. The measured values may be significantly affected, different from, e.g., stress measurement, by different influences on the potential formation at the phase boundary metal/concrete itself as well as the acquisition procedure. Due to the complexity of influencing factors there is a risk that the results are misinterpreted. Therefore, in a training concept firstly the theoretical basics of the test method should be imparted. Then, frequently occurring practical situations of various influencing factors will be made accessible to the participants by a model object specially designed for this purpose. The aim is to impart profound knowledge concerning the characteristics of potential mapping for detecting corrosion of reinforcing steel in order to apply this technique in practice as reliable and economical test method. KW - Corrosion KW - Potential mapping KW - Korrosion KW - Potentialfeldmessung PY - 2018 DO - https://doi.org/10.1155/2018/3027825 SN - 1687-9333 SN - 1687-9325 VL - 2018 SP - Article 3027825, 1 EP - 6 PB - Hindawi AN - OPUS4-46206 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Burkert, Andreas A1 - Lehmann, Jens A1 - Burkert, Annette A1 - Mietz, Jürgen T1 - Damage of stainless steel bars due to atmospheric corrosion JF - Materials and corrosion N2 - In addition to constructional requirements in civil engineering stainless steels often have to fulfil high visual demands. Unexpected impairments of the visual appearance of stainless steels under low corrosive conditions are a widespread problem today. Frequently it is supposed that this is caused by changes in the alloy composition, worse environmental conditions or improper handling. Within a research project the systematic investigation of several cases of damaged stainless steel bars has shown that the reasons are based on well-known material defects like chemical inhomogeneities (e.g. precipitations or local carburization) or geometrical defects (e.g. undercuts, rolling defects or shell formation). Thus, the failures could be clearly identified as production failures of the respective semi-finished products. KW - Atmospheric corrosion KW - EPR test KW - Failure KW - Intercrystalline corrosion KW - Stainless steel KW - Nichtrostender Stahl KW - Werkstoffauswahl KW - Dauerhaftigkeit KW - Korrosion PY - 2012 DO - https://doi.org/10.1002/maco.201005701 SN - 0947-5117 SN - 1521-4176 VL - 63 IS - 3 SP - 264 EP - 270 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-25702 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gümpel, P. A1 - Leu, F. A1 - Burkert, Andreas A1 - Lehmann, Jens A1 - Karpenko, M. T1 - Corrosion resistance of lean alloy alternatives for 300 series stainless steels - Part 2 JF - Stainless steel world N2 - The second part of this paper looks continues the comparative investigation of lean duplex stainless steels, manganese alloyed austenitic and duplex stainless steels and ferritic stainless steels. These new materials were investigated in many different test procedures and in different conditions focused on the application in civil engineering and common use. In addition to electrochemical investigations, all materials were exposed to atmospheric conditions in different surface states. In Part 2, Prof. Gümpel and his team examine the effects of coastal and urban atmospheres on the samples, and presents their final conclusions. KW - Nichtrostender Stahl KW - Duplex KW - Korrosion KW - Beständigkeit KW - Austenitic KW - Ferritic KW - Duplex KW - Manganese alloyed KW - Pitting corrosion KW - Stress corrosion cracking KW - Passive layer KW - Surface condition PY - 2014 SN - 1383-7184 IS - July/August SP - 49 EP - 52 PB - KCI Publ. BV CY - Zutphen AN - OPUS4-31348 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Gümpel, P. A1 - Leu, F. A1 - Burkert, Andreas A1 - Lehmann, Jens A1 - Karpenko, M. T1 - Corrosion resistance of lean alloy alternatives for 300 series stainless steels - Part 1 JF - Stainless steel world N2 - Rising prices of nickel and molybdenum in the recent past years have led to unprecedented interest in substituting leaner-content alloys for standard 300-series austenitic stainless steels in many applications. Due to the price volatility of various alloying elements, many new materials have entered the market, yet no direct comparison of corrosion resistance of these new materials exists. In this project, comparative investigations were carried out and in each case one or several representatives of a material group were taken into account. The material groups covered were: lean duplex stainless steels, manganese alloyed austenitic and duplex stainless steels and ferritic stainless steels. In addition to electrochemical investigations, all materials were exposed to various atmospheric conditions in different surface states. KW - Nichtrostender Stahl KW - Duplex KW - Korrosion KW - Beständigkeit PY - 2014 SN - 1383-7184 IS - June SP - 42 EP - 46 PB - KCI Publ. BV CY - Zutphen AN - OPUS4-30902 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ebell, Gino A1 - Burkert, Andreas A1 - Mietz, Jürgen T1 - Corrosion behavior of galvanized reinforcement in chloride containing mortar and carbonated mortar T2 - Intergalva 2018 N2 - Korrosionseigenschaften von feuerverzinktem Betonstahl unterscheiden sich grundlegend von herkömmlichen Betonstahl. In diesem Vortrag sind Beispiele für das Korrosionsverhalten in chloridhaltigen und carbonatisierten Mörteln dargestellt T2 - Intergalva 2018 - 25th International Galvanizing Conference CY - Berlin, Germany DA - 17.06.2018 KW - Corrosion KW - Korrosion KW - Verzinkt KW - Betonstahl PY - 2018 SP - 301 EP - 309 AN - OPUS4-45240 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -