Effect of Aluminium coating on the Ferro-Silica-Magnesium alloys’ hardness and corrosion rate

Abstract

This paper studied the effect of Aluminium coating on the Fe-Si-Mg alloys surface to its hardness and corrosion rate. The Fe-Si-Mg-Al was formed from Fe-Si-Mg Powder Alloy, which was coated by Aluminium (Al) with the composition of (0; 2.2; 6.0; 10.2) wt%. The mechanical alloying was applied to conduct a wet mixing with the ball mill in a shaker mill for two hours. The powder was then dried and compress under eight tons of pressure for three minutes. The sample was then sintered in a tabular furnace with a temperature of 1000C for two hours and 5C/minutes of heating rate. Furthermore, the natural cooling rate was applied to reach room temperature. The sample was examined in an XRD to analyze the phase and tested under a SEM-EDX to evaluate the morphological structure as well as its dispersion. The results showed that the hardness rise as the increment of Al. It is because of the oxidation of Fe, Si, and Al, which formed Fe2O3, SiO2, and Al2O3 filled out the gap. The development of Al decreased the corrosion rate. Al with the composition of (6.0 wt%) was the lowest corrosion -3 rate which the value of 1.013x10 mmpy.