Corrosion of Cr2AlC in Ar/1%SO2 Gas Between 900 and 1200 ℃
- Corrosion of Cr2AlC in Ar/1%SO2 Gas Between 900 and 1200 ℃
- 이동복; Thuan Dinh Nguyen; 박상환
- Cr2AlC; SO2; Oxidation; Sulfidation
- Issue Date
- Oxidation of metals
- VOL 75, NO 5-6, 313-323
- Cr2AlC compounds were synthesized by a powder metallurgical route
and corrosion tested at 900, 1000, 1100 and 1200 ℃ for up to 150 h under an Ar/
1% SO2 gas atmosphere. The compounds were resistant to corrosion because a thin
α-Al2O3 barrier layer quickly formed on the surface which suppressed sulfidation.
Virtually no sulfur was detected inside the scale except during the initial corrosion
stage. The superior corrosion resistance of Cr2AlC originated from the high affinity
of Al for oxygen to form the thermodynamically stable Al2O3. Unlike Al, Cr was
not active because Cr was strongly bound to carbon as Cr2C layers in Cr2AlC. The
small amount of Cr2O3 that had formed was dissolved in the Al2O3 layer. The
corrosion of Cr2AlC resulted in the formation of an α-Al2O3 layer and an underlying
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