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Corrosion behaviour of ferritic and martensitic power plant steels under conditions of dual atmospheres

  • The most efficient construction materials for boiler water walls and superheaters in steam power plants are ferritic and martensitic steels. In practical operation tubes are simultaneously exposed to combustion gas and air/steam on their opposite surfaces. The corrosion behaviour of ferritic-martensitic steels under such dual atmospheres is nondistinctive and has therefore been investigated in a special designed test equipment between 500 and 620°C. The power plant conditions were simulated wi th a flowing and pressurised (80 bar) combustion gas on the inner side of the tube which mainly consists of H2O and/or CO2. On the outer side, the tube material was exposed to air. It was discovered that under similar temperatures the oxides formed on the air side under dual atmosphere conditions were significantly different to the oxide scales formed when the alloy was exposed to air only. It is assumed that the anomalous corrosion behaviour during the dual atmosphere exposure is due to theThe most efficient construction materials for boiler water walls and superheaters in steam power plants are ferritic and martensitic steels. In practical operation tubes are simultaneously exposed to combustion gas and air/steam on their opposite surfaces. The corrosion behaviour of ferritic-martensitic steels under such dual atmospheres is nondistinctive and has therefore been investigated in a special designed test equipment between 500 and 620°C. The power plant conditions were simulated wi th a flowing and pressurised (80 bar) combustion gas on the inner side of the tube which mainly consists of H2O and/or CO2. On the outer side, the tube material was exposed to air. It was discovered that under similar temperatures the oxides formed on the air side under dual atmosphere conditions were significantly different to the oxide scales formed when the alloy was exposed to air only. It is assumed that the anomalous corrosion behaviour during the dual atmosphere exposure is due to the hydrogen transport through the bulk alloy from the combustion gas side to the air side.zeige mehrzeige weniger

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Metadaten
Autor*innen:Daniela Hünert, Wencke Schulz, Heike Nitschke, Romeo Saliwan Neumann, Gabriele Oder, Axel KranzmannORCiD
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):NACE International corrosion conference 2009 (Proceedings)
Jahr der Erstveröffentlichung:2009
Herausgeber (Institution):The National Association of Corrosion Engineers (NACE)
Erste Seite:1
Letzte Seite:10 (Paper 09263)
Freie Schlagwörter:9-12% Cr-steels; Corrosive gases; Dual atmosphere; High temperature corrosion; Hydrogen transport; Mild steels
Veranstaltung:NACE International corrosion conference 2009
Veranstaltungsort:Atlanta, Georgia, USA
Beginndatum der Veranstaltung:2009-03-22
Enddatum der Veranstaltung:2009-03-26
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Bibliotheksstandort:Sonderstandort: Publica-Schrank
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein
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