Microstructure and Corrosion Investigation of A356 Varying Reinforced with Graphite and Granite Composites

Hybrid ceramic particulate reinforced Al-Si alloy matrix composites were prepared via stir casting process. Fine micronsized Graphite and Granite powders were used. The corrosion behaviour of the composites was investigated using potentiodynamic polarization measurements. In the present investigation the corrosion measurements were carried out in 5% NaCl aqueous solution, 2.5% HCl. solution for predetermined time intervals and varying percentage concentrations of HCl solution at room temperature. Kinetics of corrosion effect on samples of Al-Si alloy, Al-Si/2wt% Graphite, Al-Si/2wt% Graphite & 2wt% Granite particles and Al-Si/2wt% Graphite & 4wt% Granite particles as reinforcement in composite are studied.