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- Title
High-temperature corrosion of aluminized and chromized Fe-10.4%Cr steels in N<sub>2</sub>/H<sub>2</sub>S/H<sub>2</sub>O-mixed gas.
- Authors
Kim, Min Jung; Lee, Dong Bok
- Abstract
Fe-10.4Cr-0.8Mn-0.2Si-0.1C (at%) steel was either chromized or aluminized via pack cementation, and corroded at 800 °C for up to 100 h in 1 atm of (N2/3.1%H2O/2.42%H2S)-mixed gas. The corrosion of the chromized coating resulted in the formation of an outer Cr2S3 and an inner Cr2O3 scale. Later, an FeS scale formed over the preformed Cr2S3/Cr2O3 scale. The corrosion of the aluminized coating led to the formation of the thin α-Al2O3 scale. At the later stage of corrosion, discrete nodules that consisted mostly of Al2O3 and Al2S3 formed locally. Aluminizing was more effective than chromizing in increasing the corrosion resistance of the steel, due mainly to the formation of α-Al2O3.
- Subjects
CEMENTATION (Metallurgy); CORROSION &; anti-corrosives; METALLIC surfaces; CHROMIZING; DIFFUSION coatings
- Publication
Materials & Corrosion / Werkstoffe und Korrosion, 2016, Vol 67, Issue 8, p810
- ISSN
0947-5117
- Publication type
Article
- DOI
10.1002/maco.201508638