Spiegel, M.: Salzschmelzenkorrosion an Überhitzern und Verdampfern. VDI Wissensforum: Beläge und Korrosion in Großfeuerungsanlagen, Hannover, Germany (2005)

Parezanovic, I.; Spiegel, M.: Selective Oxidation and Segregation during Annealing of Steels. 6th International Conference on the Microscopy of Oxidation, Birmingham, UK (2005)

Pöter, B.; Spiegel, M.: In-situ FE-SEM and EBSD investigation on the oxidation of pure iron. 6th International Conference on the Microscopy of Oxidation, Birmingham, UK (2005)

Spiegel, M.: Korrosionsprozesse an metallischen Stromsammlermaterialien in der Schmelzkarbonat-Brennstoffzelle (MCFC). 80. AGEF Seminar im Rahmen der InCom 2005, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany (2005)

Spiegel, M.: Korrosion in Müllverbrennungsanlagen. DGM Fortbildungsseminar: Hochtemperaturkorrosion, FZ, Jülich, Germany (2004)

Ruh, A.; Spiegel, M.: Influence of gas phase composition on the kinetics of chloride melt induced corrosion. EFC Workshop: Novel approaches to the improvement of high temperature corrosion resistance, DECHEMA, Frankfurt, Germany (2004)

Skobir, D.; Spiegel, M.; Arvelakis, S.; Milewska, A.; Perez, F. J.: Deposit induced corrosion of CVD coatings, steels and model alloys in simulated biomass combustion atmospheres. EFC Workshop: Novel approaches to the improvement of high temperature corrosion resistance, DECHEMA, Frankfurt, Germany (2004)

Pöter, B.; Stein, F.; Spiegel, M.; Stratmann, M.: Anfangsstadien der Oxidation von intermetallischen Fe–Al Phasen. 38. Metallographietagung der DGM, Bochum, Germany (2004)

Bernst, R.; Spiegel, M.; Schneider, A.: Metal dusting of Fe–Al alloys at 600 °C in CO–H₂–H₂O gas mixtures. EUROCORR 2004, Nice, France (2004)

Cha, S. C.; Spiegel, M.: Local reactions between NaCl and KCl particles and metal surfaces. EUROCORR, Nice, France (2004)

Park, E.; Hüning, B.; Spiegel, M.: Effects of heat treatment on the oxide layer of Fe–15 at.% Cr alloy surface. EUROCORR, Nice, France (2004)

Ruh, A.; Spiegel, M.: Influence of HCl and water vapour on the corrosion kinetics of Fe beneath molten ZnCl₂/KCl. EUROCORR, Nice, France (2004)

Pöter, B.; Stein, F.; Spiegel, M.: Oxidation Behaviour of Fe–Al Alloys Analysed Using In- and Ex-situ Techniques. EUROCORR 2004, Nice, France (2004)

Parezanovic, I.; Poeter, B.; Spiegel, M.: B and N segregation on dual phase steel after annealing. DIMAT, Krakow, Poland (2004)

Park, E.; Hüning, B.; Spiegel, M.: Annealing of Fe–15Cr alloy in N₂–5%H₂ gas mixture: Effect of hydrogen concentration. DIMAT, Krakow, Poland (2004)

Spiegel, M.: Fundamental aspects of fireside corrosion in waste and biomass fired plants. 6th Int. Symposium on High Temperature Corrosion and Protection of Materials, Lez Embiez, France (2004)

Parezanovic, I.; Spiegel, M.: Influence of B, S, P, Si and C segregation on the selective oxidation of dual phase and interstitial free steels. GALVATECH, Chicago, IL, USA (2004)

Cha, S. C.; Spiegel, M.: Studies on the local reactions of thermophoretic deposited alkali chloride particles on iron surfaces. NACE CORROSION‘ 04, New Orleans, LA, USA (2004)

Bernst, R.; Spiegel, M.; Schneider, A.: Metal dusting of iron aluminium alloys. Discussion Meeting on the Development of Innovative Iron Aluminium Alloys, MPIE Düsseldorf, Germany (2004)

Stratmann, M.; Hassel, A. W.; Spiegel, M.: Spektroskopische und reaktionskinetische Methoden zur Charakterisierung der Struktur, Eigenschaften und Stabilität von Metalloberflächen. 21. Vortrags- und Diskussionstagung Werkstoffprüfung 2003, Bad Neuenahr, Germany (2003)