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Reactivity of oxide scale on Fe–Cr alloy with Na-containing gases was examined to estimate the stability against sodium (Na): vapors of NaCl and Na 2 SO 4 exposures with air flow at 1073K. The identified reaction phases were Cr–Mn spinel, Cr 2 O 3 , and alloy from the X-ray diffraction of surface with no Na-reaction products. However, the protective oxide scales (Mn–Cr...
Oxygen diffusivity was examined in the oxide scales formed on Fe–Cr alloy surface and Mn–Co spinel coating layer. The stable isotope oxygen ( 18 O 2 ) was adopted to visualize the diffusion profiles of oxygen in the oxide scales and coating layer. A relatively fast diffusivity of 18 O was observed (diffusion coefficients were 10 −12 cm 2 s −1 orders...
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