Effect of cooling rate on segregation characteristics of 254SMO super austenitic stainless steel and pitting corrosion resistance under simulated flue gas desulfurization environment

The segregation behavior and pitting corrosion resistance under simulated flue gas desulfurization (FGD) environment of 254SMO super austenitic stainless steel (SASS) under different cooling rates were investigated by scanning electron microscopy (SEM), backscattering (BSD), electron probe microanal...

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Bibliographic Details
Published in:Journal of materials science 2023-03, Vol.58 (9), p.4137-4149
Main Authors: Li, Yunong, Zou, Dening, Li, Miaomiao, Tong, Libo, Zhang, Yingbo, Zhang, Wei
Format: Article
Language:English
Subjects:
Analysis
Austenitic stainless steels
Backscattering
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromic hydroxide
Chromium oxides
Classical Mechanics
Cooling
Cooling effects
Cooling rate
Corrosion
Corrosion mechanisms
Corrosion resistance
Corrosion resistant steels
Crystallography and Scattering Methods
Desulfurizing
Electrochemical analysis
Electron probe microanalysis
Ferric hydroxide
Flue gas
Materials Science
Metals & Corrosion
Molybdenum
Pitting (corrosion)
Polymer Sciences
Simulation
Solid Mechanics
Stainless steel
Steel
Steel, Stainless
Thermal properties
X ray photoelectron spectroscopy
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Summary:The segregation behavior and pitting corrosion resistance under simulated flue gas desulfurization (FGD) environment of 254SMO super austenitic stainless steel (SASS) under different cooling rates were investigated by scanning electron microscopy (SEM), backscattering (BSD), electron probe microanalysis (EPMA) combined with electrochemical analysis and XPS. With the increase in cooling rate, the segregation degree of Cr, Mo and Ni in 254SMO decreased first and then increased, the pitting corrosion resistance showed a trend of first increasing and then decreasing, and the passive film was mainly composed of Cr 2 O 3 , Cr(OH) 3 , Fe 2 O 3 , Fe(OH) 3 , MoO 3 , NiO and NiOOH. At higher or lower cooling rate, the proportion of protective Cr 2 O 3 was less, which led to a decrease in the protection of the passivation film, and the corrosion resistance was reduced. That is, the lightest segregation degree and the best pitting corrosion resistance of 254SMO at 100 °C/min. In addition, the corrosion mechanism of 254SMO in simulated FGD environment was discussed.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-022-08082-y