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

被引：15
|
作者：
Eklund, J. [1 ]
Hanif, I. [1 ]
Bigdeli, S. [1 ]
Jonsson, T. [1 ]
机构：
[1] Chalmers Univ Technol, Dept Chem & Chem Engn, Energy & Mat, S-41296 Gothenburg, Sweden
来源：
CORROSION SCIENCE | 2022年 / 198卷
关键词：
FeCrAl; Chromium; Silicon; STEM; High temperature corrosion; Internal oxidation; AUSTENITIC STAINLESS-STEEL; SIGMA-PHASE PRECIPITATION; FE-CR; BREAKAWAY OXIDATION; INITIAL-STAGES; KANTHAL AF; SANICRO; 28; CHROMIUM; IRON; DIFFUSION;
D O I：
10.1016/j.corsci.2022.110114
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The corrosion behavior of Fe(5-20)Cr3Al2Si model alloys and the underlying mechanisms after breakaway oxidation was investigated at 600 ?. Rapid breakaway oxidation was triggered for all alloys in the presence of KCl(s). Thermogravimetric analysis showed that alloys with a Cr content of >= 10 wt% transitioned into sub-parabolic oxidation kinetics at an early stage of the oxidation process after breakaway oxidation. Through advanced electron/ion microscopy, this behavior was attributed to high Cr-enrichment in the bottom part of the inward-growing scale, indicating the formation of a healing layer. Additionally, alloys with elevated Cr-content (>= 15 wt%) were more prone to grain boundary attack.
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页数：14
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