Morphology of oxide scales formed on chromium-silicon alloys at high temperatures

A. Solimani, T. Nguyen, J. Zhang, D.J. Young, M. Schütze, M.C. Galetz

Corrosion Science 176 (2020), 109023, DOI: 10.1016/j.corsci.2020.109023

solimani2020

Reprinted from Corrosion Science 176 (2020), 109023, A. Solimani, T. Nguyen, J. Zhang, D.J. Young, M. Schütze, M.C. Galetz, Morphology of oxide scales formed on chromium-silicon alloys at high temperatures, Copyright (2020), with permission from Elsevier

Oxide scales formed on chromium-silicon model alloys at 1200 °C in synthetic air were characterized using electron microscopy and diffraction methods. Additions of Si to chromium led to SiO2 growth underneath the chromia scale. The chromia scale was mostly fine-grained, but also contained numerous abnormally large single crystals growing out of the scale surface. Evaluation of mass transport rates shows that growth of the large grains can be supported by gas phase transport of CrO3, but not by lattice diffusion.

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