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High Temperature Corrosion of Steel X15CrNiSi25-21 (1.4841) in a Mixed Gas Atmosphere – Sample Preparation and Damage Mechanism

  • A. Schmid , G. Mori , S. Hönig , S. Strobl and R. Haubner
Published/Copyright: July 3, 2019
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Practical Metallography
From the journal Practical Metallography Volume 56 Issue 7

Abstract

Steel 1.4841 was tested as a possible reactor material for a cracking process of anthropogenic resources under simulated laboratory conditions at 680 °C. The gas atmosphere present in this process contains HCl as well as H2S.

In order to evaluate the corrosion behavior, metallographic sections were prepared from the corroded samples. The preparation for the SEM/EDS examination had to be performed under exclusion of water, as otherwise the readily water-soluble metal chlorides would not have been detected.

A layered, porous structure of the corrosion products (oxides and sulfides of Cr) could be observed. The lowermost layer contains chromium and iron chlorides. Nickel could not be found in any of the corrosion products.

In order to estimate the long-term resistance, aging tests were performed at 680 °C in an inert atmosphere for up to 1600 h before the actual corrosion tests. The formation of Cr23C6 and also of Ϭ phase could be evidenced by TEM. Compared to the non-aged samples, the chromium depletion caused by aging resulted in slightly increased corrosion rates.

Kurzfassung

Der Stahl 1.4841 wurde als möglicher Reaktorwerkstoff, für einen Crackprozess von anthropogenen Ressourcen unter simulierten Laborbedingungen, bei 680 °C getestet. Die auftretende Gasatmosphäre enthält sowohl HCl als auch H2S.

Zur Evaluierung des Korrosionsverhaltens wurden metallographische Schliffe der korrodierten Proben angefertigt. Um diese mittels REM/EDX untersuchen zu können, musste die Präparation unter Ausschluss von Wasser stattfinden, da die leicht wasserlöslichen Metallchloride andernfalls nicht erfasst worden wären.

Es wurde ein schichtförmiger, poröser Aufbau der Korrosionsprodukte (Oxide und Sulfide von Cr) nachgewiesen. Die unterste Schicht enthält Chloride von Chrom und Eisen. Nickel wurde in keinem der Korrosionsprodukte gefunden.

Zur Abschätzung der Langzeitbeständigkeit wurden vor den eigentlichen Korrosionsversuchen Auslagerungstests bis zu 1600 h, bei 680 °C, in inerter Atmosphäre, durchgeführt. Es wurde die Bildung von Cr23C6 und auch der Ϭ-Phase mittels TEM nachgewiesen. Die dadurch verursachte Chromverarmung führte im Vergleich zu nicht ausgelagerten Proben, zu leicht erhöhten Korrosionsraten.

Übersetzung: E. Engert

References / Literatur

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Received: 2019-02-15
Accepted: 2019-03-15
Published Online: 2019-07-03
Published in Print: 2019-07-15

© 2019, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Combination of Nanoindentation and Microscopy for the Examination of Aluminum Alloys in Coarse- and Ultrafine-Grained Condition
  7. Metallographic Contrasting of Weld Joints on Duplex Stainless Steel
  8. Examination of Oxide Scales Formed During Hot Rolling of Steels
  9. High Temperature Corrosion of Steel X15CrNiSi25-21 (1.4841) in a Mixed Gas Atmosphere – Sample Preparation and Damage Mechanism
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
https://doi.org/10.3139/147.110592

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Combination of Nanoindentation and Microscopy for the Examination of Aluminum Alloys in Coarse- and Ultrafine-Grained Condition
  7. Metallographic Contrasting of Weld Joints on Duplex Stainless Steel
  8. Examination of Oxide Scales Formed During Hot Rolling of Steels
  9. High Temperature Corrosion of Steel X15CrNiSi25-21 (1.4841) in a Mixed Gas Atmosphere – Sample Preparation and Damage Mechanism
  10. Meeting Diary/Veranstaltungskalender
  11. Meeting Diary
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