In this work, a photospectrometric method was used to quantify chromium evaporation from the AISI 441 ferritic stainless steel. Experiments were conducted for 250 h in the temperature range of 650–850 °C to evaluate the time and temperature dependence of chromium evaporation in the initial oxidation stage. The results showed a thermally activated process with an activation energy of 218.3 kJ·mol−1 and parabolic evolution over time at 650 and 750 °C, while a change in the evaporation kinetics was observed at 850 °C, resulting in a linear trend. A diffusion-evaporation model was applied and compared to the experimental data demonstrating the role of the chromium cation diffusion on the evaporation process.

Volatilization of chromium from AISI 441 stainless steel: Time and temperature dependence

Spotorno R.;Paravidino D.;Delsante S.;Piccardo P.
2022

Abstract

In this work, a photospectrometric method was used to quantify chromium evaporation from the AISI 441 ferritic stainless steel. Experiments were conducted for 250 h in the temperature range of 650–850 °C to evaluate the time and temperature dependence of chromium evaporation in the initial oxidation stage. The results showed a thermally activated process with an activation energy of 218.3 kJ·mol−1 and parabolic evolution over time at 650 and 750 °C, while a change in the evaporation kinetics was observed at 850 °C, resulting in a linear trend. A diffusion-evaporation model was applied and compared to the experimental data demonstrating the role of the chromium cation diffusion on the evaporation process.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11567/1071476
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