Zusammenfassung
Ausgewählte austenitische Stähle und Nickelbasislegierungen wurden im Hinblick auf ihr Korrosionsverhalten bei 700 °C in einem H2-H2O-H2S-Modellgas untersucht. Werkstoffe, die unter diesen Bedingungen die geringsten Korrosionsraten aufwiesen, wurden detailliert bezüglich der Temperaturabhängigkeit der Korrosionsraten bei 500–700 °C erprobt. Dabei zeigten Alloy 693, 625 und 740 eine anomale Temperaturabhängigkeit der Korrosionsraten, während alloy HR-160 bei allen Temperaturen sehr geringe Korrosionsraten aufwies. Bei Grundlagenuntersuchungen an Modelllegierungen zeigte sich, dass hohe Co-Zusätze zu binären NiCr-Legierungen die Korrosionsraten deutlich reduzieren und bei 650 sowie 700 °C zur Bildung von Cr-Oxidschichten führten. Zusätze von Ti oder Si in einer NiCrCo-Modelllegierung förderten die Cr-Oxidbildung bei niedrigen Temperaturen (500–600 °C). Auch Zusätze von Nb zu einer binären NiCr-Modelllegierung bewirkten im Gegensatz zu Zusätzen von Mo eine Reduzierung der Korrosionsraten durch Bildung Nb-reicher intermetallischer Phasen an der Schicht/Legierungs-Grenzfläche. Allerdings trat dieser positive Effekt lediglich bei den höchsten Versuchstemperaturen (650 und 700 °C) auf.
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Zurek, J., Hejrani, E., Müller, M., Quadakkers, W.J. (2018). Korrosionsverhalten metallischer Werkstoffe in schwefelhaltigen Gasen mit niedrigem Sauerstoffpartialdruck im Temperaturbereich 500–700 °C. In: Krzack, S., Gutte, H., Meyer, B. (eds) Stoffliche Nutzung von Braunkohle. Springer Vieweg, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-46251-5_32
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