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Role of M23C6 carbide on the corrosion characteristics of modified 9Cr-1Mo steel in N2-O2-CO2-SO2 atmosphere at 650 °C
- Source :
- Applied Surface Science. 483:417-424
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- In this study, the oxidation and sulfidation characteristics of modified 9Cr 1Mo steels according to Cr-rich M23C6 distributed in grain boundaries in the N2-O2-CO2-SO2 atmosphere at 650 °C were analyzed. The oxidation kinetic was obeyed by the parabolic law. The oxide layer presented a three-layer structure consisting of hematite, magnetite, and Fe Cr spinel from the outside. In the initial oxidation stage, Cr-rich M23C6 exposed to the surface acted as nuclei of Cr-rich oxide. However, it is thought to hardly effect on the growth of the outer oxide layer. The Cr-rich M23C6 distributed in grain boundaries preferentially formed a Cr2O3 layer at the oxide/matrix interface, and internal oxidation characteristics were shown to be different depending on the presence or absence of SO2 in the atmosphere.
- Subjects :
- Materials science
Spinel
Sulfidation
Oxide
General Physics and Astronomy
02 engineering and technology
Surfaces and Interfaces
General Chemistry
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
Surfaces, Coatings and Films
Corrosion
Carbide
chemistry.chemical_compound
Chemical engineering
chemistry
engineering
Grain boundary
0210 nano-technology
Internal oxidation
Magnetite
Subjects
Details
- ISSN :
- 01694332
- Volume :
- 483
- Database :
- OpenAIRE
- Journal :
- Applied Surface Science
- Accession number :
- edsair.doi...........6e16cb0b0f48e4bdb6ee98918528d64e