TY - CONF A1 - Rosemann, P. A1 - Babutzka, Martin A1 - Heyn, Andreas A1 - Halle, T. T1 - Influence of heat treatment on corrosion resistance of martensitic stainless steels 1.4034 and 1.4021 N2 - In the last years, new approaches for the evaluation of the corrosion resistance of stainless steels were developed which allow short term corrosion testing with increased information content. This work analyses the extensive influence of heat treatment on microstructure and the resulting corrosion resistance of the martensitic stainless steels 1.4034 and 1.4021 with advanced methods. Different heat treatments at various austenitization temperatures up to 1100°C and the effect of different cooling rates were evaluated; the last has not yet been studied in literature at all. The resulting corrosion behaviour in relation to the different carbon content in the two used alloys and the applied heat treatment will be presented and discussed. The applied methods of investigation were conventional evaluation of the critical pitting corrosion potential (PP), modified electrochemical potentiodynamic reactivation (mEPR) and the "KorroPad" (KP) technique. The performance of modified EPR and its interpretation were optimized to provide additional information about the general passivation ability and the extent of chromium depletion as result of applied heat treatment. The aim using PP and KP was the correlation between the Parameters of the mEPR with the changes in the pitting corrosion resistance. Furthermore the results will demonstrate the functionality and usability of the short term corrosion test methods mEPR and KP in order to increase their acceptance within the scientific community. The results indicate a surprisingly large influence of both austenitization temperature and cooling rate on the corrosion resistance within all three used test methods, which can explain the different corrosion behaviour of martensitic stainless steels in earlier investigations. T2 - EUROCORR 2014 - European corrosion congress CY - Pisa, Italy DA - 08.09.2014 KW - Martensitic stainless steel KW - KorroPad KW - Pitting corrosion KW - Polarisation PY - 2014 SN - 978-3-89746-159-8 SP - O EP - 7455, 146 AN - OPUS4-31481 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Müller, Thoralf A1 - Heyn, Andreas A1 - Babutzka, Martin A1 - Rosemann, P. T1 - Examination of the influence of heat treatment on the corrosion resistance of martensitic stainless steels N2 - Martensitic stainless steels are commonly used in cutlery fabrication requiring high hardness and sufficient corrosion resistance. The heat treatment process affects the mechanical and electrochemical behavior of martensitic stainless steels due to the precipitation of chromium carbides. Depending on the heat treatment the corrosion resistance of these steels can vary strongly, and improper heat treatment parameters can lead to a weak pitting corrosion resistance. The aim of this work is to identify heat treatment parameters influencing the corrosion resistance of martensitic stainless steels by using three different electrochemical testing methods. To this purpose, five different heat treatments were applied to the alloys 1.4116 and 1.4034. In addition to the determination of the critical pitting potentials and the modified double-loop electrochemical potentiodynamic reactivation tests (DL-EPR) a new KorroPad indicator test was used assessing the pitting corrosion behavior. The results showed that all methods used were in good agreement for verifying the influence of the various heat treatment parameters on the corrosion behavior and to identify the effect of heat treatment conditions on the pitting corrosion resistance. KW - DL-EPR KW - Heat treatment KW - KorroPad KW - Martensitic stainless steel KW - Pitting corrosion PY - 2015 U6 - https://doi.org/10.1002/maco.201407861 SN - 0947-5117 SN - 1521-4176 VL - 66 IS - 7 SP - 656 EP - 662 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-33621 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rosemann, P. A1 - Müller, Thoralf A1 - Babutzka, Martin A1 - Heyn, Andreas T1 - Influence of microstructure and surface treatment on the corrosion resistance of martensic stainless steels 1.4116, 1.4034, and 1.4021 N2 - In the last years, new approaches for the evaluation of the corrosion resistance of martensitic stainless steels were developed, which allow nearly non-destructive as well as short-term corrosion testing. This work analyzes the sensitive influence of microstructure and surface treatment on the corrosion resistance. The effect of alloy composition and microstructure, which is always present in addition to the influence of various surface treatments will be evaluated and discussed. The corrosion behavior was investigated with conventional evaluation of the pitting potential, electrochemical potentiodynamic reactivation (EPR), electrochemical noise (EN), and the 'KorroPad' (KP) technique. EPR provided information about the passivation ability and the extent of chromium content reduction due to chromium carbide precipitation in the microstructure. The use of EN and KP aims to detect the influence of different surface treatment parameters on the corrosion resistance in a nearly non-destructive way. Furthermore the results shall demonstrate the functionality and convenience of the short-term corrosion test methods EN and KP in order to gain more acceptance within the scientific community. The results will allow the extraction of surface treatment effects on the corrosion behavior of the martensitic stainless steels 1.4116, 1.4034, and 1.4021. KW - Corrosion resistance KW - Electrochemical noise KW - Martensitic stainless steel KW - Electrochemical potentiodynamic reactivation KW - KorroPad KW - EPR-Test KW - Heat treatment PY - 2015 U6 - https://doi.org/10.1002/maco.201307276 SN - 0947-5117 SN - 1521-4176 VL - 66 IS - 1 SP - 45 EP - 53 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-32572 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rosemann, P. A1 - Reinemann, Steffi A1 - Lehmann, Jens A1 - Babutzka, Martin A1 - Burkert, Andreas T1 - Ursachen korrosionsanfälliger Oberflächen bei geschliffenen nichtrostenden Stählen N2 - Ergebnisse aus dem AiF Forschungsvorhaben IGF 18823 N/1 "Optimierung von Korundschleifprozessen" Ein Referenzwerkstoff mit einem definierten Oberflächenzustand wurde zunächst umfassend mittels elektrochemischer Korrosionsuntersuchungen, KorroPad-Untersuchungen und oberflächenanalytischer Verfahren charakterisiert. Anhand definierter Schleifversuche an diesem Referenzzustand wurden anschließend verschiedene Schleifparameter variiert, deren Auswirkungen auf die Korrosionsbeständigkeit mit den gleichen Methoden beurteilt wurden. Somit war es möglich, den Einfluss einzelner Schleifparameter auf das Korrosionsverhalten aufzuzeigen. T2 - MDZ Forschungsseminar 2019 CY - Magdeburg, Germany DA - 12.03.2019 KW - Nichtrostender Stahl KW - Korrosionsschnelltest KW - KorroPad KW - Passivschicht PY - 2019 AN - OPUS4-47535 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Reinemann, Steffi A1 - Rosemann, P. A1 - Babutzka, Martin A1 - Lehmann, Jens A1 - Burkert, Andreas T1 - Influence of grinding parameters on the corrosion behavior of austenitic stainless steel N2 - Samples of the austenitic stainless steel grade X5CrNi18‐10 (1.4301, AISI 304) were ground industrially with various grinding parameters to study their influence on corrosion resistance. The ability of the mechanically ground surfaces to form a stable passive layer was evaluated by KorroPad test and a modified electrochemical potentiodynamic reactivation test based on a single loop (EPR‐SL). Furthermore, the surfaces were characterized by surface analytical methods. The main influence was determined regarding abrasive belt type. Surfaces mechanically ground with granulate abrasive belts constantly had a lower corrosion resistance than surfaces ground with single‐coated grain. The granulate abrasive belts generated more sensitized surface areas and left formations of welded sample material on the mechanically ground surfaces. A post‐treatment with a nonwoven abrasive proved to be an effective finishing process by which the surface defects and sensitized material got removed and the surfaces regained the expected corrosion resistance. KW - Abrasive belt KW - Austenitic stainless steel KW - Electrochemical potentiodynamic reactivation KW - Grinding KW - KorroPad KW - Surface KW - Corrosion PY - 2019 U6 - https://doi.org/10.1002/maco.201910874 SN - 0947-5117 SN - 1521-4176 VL - 70 IS - 10 SP - 1776 EP - 1787 PB - Wiley-VCH Verlag CY - Weinheim AN - OPUS4-47871 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -