Oxidation kinetics and microstructure evolution of high Mn stainless-steel alloy in CO2 at 700 °C

Oxidation kinetics and scale formation were examined in 21–2N Stainless Steel alloys in a CO2 environment at 700 °C. Several characterization techniques were used to identify the morphology, crystallographic structure, and chemical composition of the oxide scale formation during exposures up to 1925...

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Bibliographic Details
Published in:Corrosion science 2022-02, Vol.195 (C), p.110013, Article 110013
Main Authors: Abdallah, Iman, Kim, Taeho, Wu, Xueyang, Bailly-Salins, Louis, Elbakhshwan, Mohamed, Carroll, Mark, Tonks, Michael R., Perepezko, John H., Couet, Adrien
Format: Article
Language:English
Subjects:
Alloy steels
Body centered cubic lattice
Carbon dioxide
Carburization (corrosion)
Chemical composition
Crystal structure
Crystallography
Depletion
Face centered cubic lattice
High temperature corrosion
Kinetics
Manganese
Oxidation
Phase transitions
Reaction kinetics
Scale (corrosion)
Scale formation
SEM
Stainless steel
Stainless steels
Steel alloys
TEM
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Summary:Oxidation kinetics and scale formation were examined in 21–2N Stainless Steel alloys in a CO2 environment at 700 °C. Several characterization techniques were used to identify the morphology, crystallographic structure, and chemical composition of the oxide scale formation during exposures up to 1925 h. High manganese content played an important role in homogenous oxide scale formation of Mn3O4 and MnCr2O4 at the scale/gas and scale/alloy interfaces and as an FCC stabilizer in the alloy. Depletion of Mn resulted in an FCC to BCC phase transformation at the scale/alloy interface. No carburization was observed, indicating that the oxide layer is preventing carbon uptake. [Display omitted] •Relatively high corrosion resistance of 21–2N stainless-steel alloy in CO2.•Protective Mn3O4 and MnCr2O4 at scale/gas and scale/alloy interface.•Mn acts as an FCC stabilizer.•Depletion of Mn near scale/alloy interface led to BCC phase transformation.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.110013