High temperature corrosion behavior of FeCrAlSi model alloys in the presence of water vapor and KCl at 600 °C – The influence of Cr content

The corrosion behavior of Fe(5−20)Cr3Al2Si model alloys and the underlying mechanisms after breakaway oxidation was investigated at 600 °C. Rapid triggered for all in presence KCl(s). Thermogravimetric analysis showed that with a Cr content ≥ 10 wt% transitioned into sub-parabolic kinetics an early stage process oxidation. Through advanced electron/ion microscopy, this attributed to high Cr-enrichment bottom part inward-growing scale, indicating formation healing layer. Additionally, elevated Cr-content (≥15 wt%) were more prone grain boundary attack.