| High temperature corrosion behaviors of type 304 and 410 steels in dry oxidizing gas-argon mixtures have been studied in detail over a temperaturerange of 800-1100℃ using thermogravimetry, metallography, x-ray analyses and EPMA. From the results obtained, the oxidation rate as a function of the ratio of oxidizing gas to argon and the temperature has been determined. The overall apparent rate was close to parabolic law for all experimental specimens. It was confirmed that the apparent activation energies calculated for the oxidation in all cases were ranged to be 15-27 and 10-21 ㎉/㏖ respectively for type 304 and 410 steel. The spinel layer in the product scale containing (Cr.Fe)₂O₃, NiFe₂O₄ and NiCr₂O₄ in type 304 steel, and that of(Cr.Fe)₂O₃ in type 410 steel were also observed. |
|
