Formation of iron oxides nanoparticles on low carbon steel under controlled conditions
by A.A. El-Meligi, A.M. Al-Saie, M. Bououdina
International Journal of Nanoparticles (IJNP), Vol. 3, No. 1, 2010

Abstract: A clean route for oxide scale grown on low carbon steel alloy surface at 650°C under controlled heating rate and oxidation period, was investigated. It was found that using controlled conditions of a certain heating rate and an oxidation time led to remarkable changes in the formation of the oxide scale phases and the crystallites size. X-ray diffraction patterns show the formation of α-Fe₂O₃ and Fe₃O₄ phases with some preferred orientation in the (100) direction. The estimated average crystallites size of the oxide scale is about 30 nm after 60 hours of oxidation time at 650°C under constant heating rate of 0.1°C/min. Increasing the oxidation time slightly increases the crystallite size. The oxide scale exhibited a relatively medium saturation magnetisation of 34.59 emu/g. This indicates the presence of mixture of Fe oxides, predominately α-Fe₂O₃ and Fe₃O₄ phases, as observed in the X-ray diffraction patterns.

Online publication date: Thu, 13-May-2010

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