Cyclic and isothermal oxidation behavior of 2.25Cr-1Mo steel
DOI:
https://doi.org/10.3989/revmetalm.003Keywords:
Boiler steel, High temperature corrosion, Kinetic law, Thermal cyclingAbstract
Cyclic and isothermal oxidation of chromium-molybdenum steel 2.25Cr-1Mo were analyzed at 550 °C and 650 °C during 360 hours in air atmospheres. The cycles were performed with two stages; one of heating in furnace during 90 minutes and then the sample were cooled to 50 °C by air flow. Thermogravimetric analyses were performed to obtain high temperature corrosion kinetics. Several characterization techniques have been used to identify the corrosion mechanism, as X-Ray Diffraction (XRD), Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). Thermal cycling tests can changes the corrosion mechanism, due cracks propagation in oxide scale, that witch can favors the access of oxidant agent to the substrate.
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