Aluminium (Al) is an active metal which will oxidise readily through a rapid formation of a natural oxide film of
alumina on the surface. This surface oxide film provides the corrosion resistance to the Al. A simultaneous thermal analysis
consisting of thermogravimetry analysis/differential scanning calorimetry (TGA/DSC) on different morphology and size of Al
powders was carried out in air up to the temperature of 1600o
C. The study shows that the Al oxidation occurs in two stages,
i.e. the solid- and the liquid-state .The rate of the oxide film growth becomes more rapid at higher temperature. There is a
significant influence of the powders’ morphology and size on the initial temperature in each stage of the oxidation process.
The smallest Al-irregular powder (9 µm) r esults in the highest degree of oxidation (86%) followed by the coarse Al flakes
(73 µm), 85%, Al spherical sized 9 µm, 80%, and Al spherical of 56 µm, 46%
