TY - GEN A1 - Stelling, Karen A1 - Böllinghaus, Thomas A1 - Wolf, Martin A1 - Schöler, Annett A1 - Burkert, Andreas A1 - Isecke, Bernd ED - Böllinghaus, T. ED - Herold, H. T1 - Hot cracks as stress corrosion cracking initiation sites in laser welded corrosion resistant alloys T2 - Hot cracking phenomena in welds N2 - Although hot cracks at weld surfaces of corrosion resistant alloys (CRAs) might provide access to respective aggressive media and thus, might provide the conditions for a local potential and pH drop, the interaction between hot cracking and corrosion phenomena has not been investigated up to the present. This particularly concerns the initiation of stress corrosion cracking inside such crevices. As a first approach to clarify the influence of hot cracks on corrosion resistance, considering particularly stress corrosion cracking, hot crack afflicted laser welds of three different CRAs have been subjected to a series of different corrosion tests. Besides the fact that the Drop Evaporation (DE) Test represents a more realistic procedure than standard immersion tests it turned out that hot cracks can obviously represent an initiation site of stress corrosion cracking in the austenitic stainless steel AISI 309 (German No. 1.4828). The susceptibility of such hot crack afflicted laser welds to stress corrosion cracking (SCC) significantly depends on temperature and chloride concentration of the test environment In comparison, the high nitrogen austenitic stainless steel AISI S 34565 (German No. 1.4565) did not exhibit any stress corrosion cracking associated with hot cracking. This material exhibited pitting corrosion and stress corrosion only in the base material. The Alloy 50 (German No. 2.4850), a Nickel based material, was susceptible to pitting corrosion, but showed no tendency towards stress corrosion cracking at all. T2 - International Workshop "Hot Cracking Phenomena in Welds" CY - Berlin, Germany DA - 2004-03-04 KW - Ni-Base Alloy KW - Stress corrosion Cracking KW - Hot Cracking KW - Laser Welding KW - Austenitic Stainless Steel KW - Drop Evaporation Test PY - 2005 SN - 3-540-22332-0 DO - https://doi.org/10.1007/3-540-27460-X_10 SP - 165 EP - 182 PB - Springer CY - Berlin AN - OPUS4-11852 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Isecke, Bernd A1 - Eichler, Thorsten A1 - Burkert, Andreas T1 - Investigations on the repassivation of carbon steel in consequence of cathodic polarization T2 - EUROCORR 2007 - Progress by corrosion control N2 - Pitting corrosion of carbon steel and iron in chloride containing alkaline environment is already well investigated, although a couple of questions are not clarified satisfactorily. The critical chloride content for steel in concrete and the critical chloride to hydroxide ion ratio for steel in alkaline solutions is still a major concern, considering chloride induced corrosion problems of steel in concrete. Another not satisfactorily clarified point is the repassivation of carbon steel in consequence of cathodic polarization. In the recent literature some indications are shown that repassivation occurs after a certain time of polarization. GLASS [4-9] and PEDEFERRI [1-3] draw the conclusion that the ennoblement of open circuit potentials (OCP) indicates re-passivation effects due to cathodic polarization. SAGÜÉS [10] carried out potentiodynamic repassivation tests and draws the conclusion that the repassivation potential Er is nearly independent of the solution composition, but influenced by severity of corrosion attack and is in the potential range from - 0.8 V to - 0.4 V vs. Saturated Calomel Electrode (SCE). The transferability of SAGÜÉS’ results to questions concerning cathodic protection (cp) is questionable, as potentiodynamic polarization tests (PPT) give no information on changes induced by long time polarization. Therefore, the investigations discussed in this paper aim to clarify, to what extend the re-passivation of carbon steel due to cathodic polarization occurs, and if the ennoblement of OCP is a sufficient indication for repassivation. In a first step the corrosion state of five nominal equal test specimens was determined by electrochemical techniques, i.e. electrochemical noise measurements (ENM) and electrochemical impedance spectroscopy (EIS). After determining the initial corrosion state by evaluating the charge transfer resistance and the polarization resistance respectively as well as evaluating potential and current noise signals, the specimens were polarized cathodically. Impedance data were recorded previous to, during and after polarization. The impedance data were evaluated by equivalent circuit fitting with special attention to charge transfer resistances and diffusion properties. The results show that reduction of oxides and oxygen diffusion during cathodic polarization has strong impact on the system’s behavior. T2 - EUROCORR 2007 CY - Freiburg im Breisgau, Germany DA - 2007-09-09 KW - Concrete KW - Carbon steel KW - Cathodic protection KW - Re-passivation KW - Pitting corrosion PY - 2007 N1 - Serientitel: EFC-Event – Series title: EFC-Event IS - 289 SP - 1 EP - 15 PB - DECHEMA CY - Frankfurt am Main AN - OPUS4-15822 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Isecke, Bernd A1 - Burkert, Andreas A1 - Lehmann, Jens A1 - Ebell, Gino T1 - Korrosions- und Verbundverhalten verzinkter Betonstähle in Betonen mit chromatreduzierten Zementen KW - Verzinkter Betonstahl KW - Chromatreduzierte Zemente KW - Verbundverhalten KW - Dauerhaftigkeit KW - Korrosion PY - 2010 SN - 978-3-8167-8251-3 IS - Bauforschung T3230 SP - 1 EP - 61 PB - Fraunhofer IRB Verl. CY - Stuttgart AN - OPUS4-21051 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Isecke, Bernd A1 - Beck, Matthias A1 - Burkert, Andreas A1 - Lehmann, Jens A1 - Faulhaber, Armin T1 - Dauerhaftigkeitsbemessung von Stahlbetonbauteilen auf Bewehrungskorrosion - Teil 1: Systemparameter der Bewehrungskorrosion - Ermittlung der Systemparameter und quantitative Bewertung der Eigenkorrosion auf den Korrosionsfortschritt an depassiviertem Bewehrungsstahl PY - 2012 SN - 978-3-410-65221-2 SN - 0171-7197 IS - 601 / Beitrag 2 SP - 19 EP - 57 PB - Beuth CY - Berlin AN - OPUS4-27571 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Goebbels, Jürgen A1 - Isecke, Bernd A1 - Beck, Matthias A1 - Burkert, Andreas A1 - Bäßler, Ralph T1 - Monitoring of corrosion processes in chloride contaminated mortar by electrochemical measurements and X-ray tomography T2 - EUROCORR 2008 - Managing corrosion for sustainability N2 - Corrosion of steel reinforcement in concrete exposed to chloride containing environments is a serious problem in civil engineering practice. Electrochemical methods, e.g. potential mapping, provide information whether the steel reinforcement is still passive or depassivation has been initiated. By applying such techniques no information on the type of corrosion, its extent and distribution of corrosion products is available. Particular the corrosion progress is a significant problem. Especially in the case of element corrosion in reinforced concrete structures, the development at the anode can not be separated into corrosion damage causing by element corrosion or self-corrosion. Until now also in laboratory tests it is impossible to collect such information without destroying specimens after electrochemical testing was performed place. To overcome this problem it was tried to study the steel surface within the mortar specimens by X-ray tomography (CT). Within the scope of these investigations it could be shown, that X-ray tomography is suitable to make corrosion pits visible which are embedded in a mortar with a cover thickness of about 35 mm. In this publication the corrosion damage of reinforced steel is documented timedependent by X-ray tomography. T2 - EUROCORR 2008 CY - Edinburgh, Scotland, UK DA - 2008-09-07 KW - Self-corrosion KW - X-ray tomography KW - Reinforcement KW - Concrete parameters PY - 2008 N1 - Serientitel: EFC-Event – Series title: EFC-Event IS - 299 SP - 1 EP - 10 PB - DECHEMA CY - Frankfurt am Main AN - OPUS4-17868 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Goebbels, Jürgen A1 - Beck, Matthias A1 - Isecke, Bernd A1 - Burkert, Andreas A1 - Bäßler, Ralph ED - Castro-Borges, P. ED - Moreno, E.I. ED - Sakai, K. ED - Gjorv, O.E. ED - Banthia, N. T1 - Self-corrosion of steel in concrete by electrochemical measurements and X-ray tomography T2 - CONSEC`10 - Concrete under severe conditions - Environment and loading (Proceedings) T2 - CONSEC`10 - 6th International conference on concrete under severe conditions CY - Mérida, Yucatán, Mexico DA - 2010-06-07 KW - Self-corrosion KW - Steel KW - Concrete KW - X-ray tomography PY - 2010 SN - 978-0-415-59316-8 VL - 2 SP - 1221 EP - 1228 PB - Taylor & Francis CY - London, UK AN - OPUS4-22299 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Eichler, Thorsten A1 - Isecke, Bernd A1 - Burkert, Andreas T1 - Electrochemical noise measurements for monitoring the repassivation of mild steel after cathodic polarization T2 - Proceedings of the 1st International Conference Corrosion and Material Protection and 10th conference AKI 2007 KW - Electrochemical Noise KW - Electrochemical Impedance Spectroscopy KW - Cathodic Protection KW - Steel in Concrete KW - Repassivation KW - Corrosion Monitoring PY - 2007 SN - 978-80-903933-0-1 SP - 1 EP - 7 PB - SVUOM CY - Prag AN - OPUS4-15895 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bäßler, Ralph A1 - Burkert, Andreas A1 - Isecke, Bernd T1 - Electrochemical devices for determination of corrosion related values for reinforced concrete structures T2 - Know NACE - corrosion 2007 T2 - NACE International Corrosion 2007 - Conference & Expo CY - Nashville, TN, USA DA - 2007-03-11 KW - Chloride Induced Corrosion KW - Moisture Content KW - Embedded Sensors KW - Reinforced Concrete KW - Monitoring PY - 2007 SP - 07377/1 EP - 07377/13 PB - NACE CY - Nashville AN - OPUS4-14707 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Burkert, Andreas A1 - Isecke, Bernd T1 - Edelstahl Rostfrei in Kontakt mit anderen Werkstoffen T2 - Tagungsband "Verbindungstechnik am Bau - Aktuelle Entwicklungen mit Edelstahl Rostfrei" N2 - Einleitung; Grundlagen der Bimetallkorrosion (Kontaktkorrosion); Einflussgrößen und Beispiele: Elektrolytwiderstand, Befeuchtungsdauer/Umgebung, Kinetik der Elektrodenreaktionen, Flächenverhältnis Kathode/Anode; Praktische Erfharungen in verschiedenen Anwendungsbereichen: Wasser- und Abwassertechnik, Bauteile an der Atmosphäre, Bauwesen, Fahrzeugbau; Häufige gestellte Fragen; Vermeidung von Bimetallkorrosion; Literatur T2 - Fachtagung "Verbindungstechnik am Bau - Aktuelle Entwicklungen mit Edelstahl Rostfrei" CY - Würzburg, Deutschland DA - 2004-04-27 KW - Bimetallkorrosion KW - Edelstahl Rostfrei KW - Mischverbindungen KW - Verbindungstechnische Lösungen PY - 2004 VL - D884 SP - 49 EP - 64 AN - OPUS4-3522 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Burkert, Andreas A1 - Fischer, Joachim A1 - Isecke, Bernd ED - Weber, T. T1 - Edelstahl Rostfrei in Kontakt mit anderen Werkstoffen und desinfizierenden Medien T2 - GfKORR-Seminar Nichtrostende Stähle können rosten? T2 - GfKORR-Seminar "Nichtrostende Stähle können rosten? Auf die Randbedingungen kommt es an ..." CY - Frankfurt am Main, Deutschland DA - 2004-09-27 KW - Galvanische Korrosion KW - Bimetallkorrosion KW - Einflussgrößen KW - Abhilfemaßnahmen KW - Desinfektionsmaßnahmen KW - Korrosionspotentiale PY - 2004 SN - 3-935406-15-0 SP - 99 EP - 112 PB - GfKORR CY - Frankfurt am Main AN - OPUS4-4400 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -