High Temperature Oxidation Behavior of S44535 Ferritic Stainless Steel

Abstract

In order to explore the effect of rare earth La on the high-temperature oxidation behavior of S44535 ferritic stainless steel， accelerated oxidation was used to study the high-temperature oxidation of S44535 steel added with 0.26% La in static air at 800°C，900 ℃and 1 000 ℃. In this paper， the oxidation kinetic curves of S44535 ferritic stainless steel at three temperatures were compared by constant temperature oxidation method， and the oxide layer of steel was characterized by scanning electron microscopy （SEM）， energy spectroscopy analyzer （EDS） and X-ray diffraction （XRD）， and the effect of rare earth La on the high-temperature oxidation resistance of ferritic stainless steel was explored. The results showed that the oxidation products were mainly Cr2O3 and MnCr2O4， and with the increase of temperature， the surface oxide film thickened and became denser， and its outer layer was rich in Mn， and the inner layer was rich in Cr， indicating that rare earths changed the growth direction of the oxide film， and showed excellent high temperature oxidation resistance performance.

Keywords

• solid oxide fuel cells； ferritic stainless steel； high temperature oxidation； oxidation kinetics； rare earth la