Corrosion of Fe₃Al-4Cr Alloys at 1000°C in N₂-0.1%H₂S Gas

Abstract:

Pure Fe₃Al and Fe₃Al+4%Cr alloys were corroded at 1000 °C for up to 200 h in N₂-0.1%H₂S-mixed gas in order to study their corrosion behavior in H₂S-containing atmosphere. The formed scales consisted primarily of α-Al₂O₃, FeAl₂O₄, and Fe₂O₃. In these oxide scales, hydrogen and sulfur dissolved according to the reaction; H₂S→2H+S. Corrosion products of Cr were not identified in the scales from the XRD analysis, indicating that Cr dissolved in the oxide scales. Fe₃Al+4%Cr alloy displayed poorer corrosion resistance than Fe₃Al alloy, indicating that chromium accelerated the corrosion rates of Fe₃Al alloys.

• Periodical: Key Engineering Materials (Volume 765)
• Pages: 173-177
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.765.173
• Online since: March 2018
• Authors: Yu Ke Shi, Dong Bok Lee*
• Keywords: H₂S Gas, High-Temperature Corrosion, Iron Aluminides Based on Fe₃Al, Oxidation, Sulfidation

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