en Research Paper Research Paper In this study, corrosion behaviour of A356-10 vol.% SiC composites casted by gravity and squeeze casting is evaluated. For this purpose, prepared samples were immersed in HCl solution for 1h at open circuit potential. Tafel polarization and electrochemical impedance spectroscopy (EIS) were carried out to study the corrosion resistance of composites. The Tafel polarization and EIS studies of the corrosion behaviour of the A356-10 vol.% SiC composites showed that the corrosion resistance of the composite casted by squeeze casting was higher than that of the composites casted by gravity in selected corrosion media. Also, the Tafel polarization and EIS studies revealed that the corrosion current densities of both composites increase with the increase in the concentration of HCl. The micrographs of scanning electron microscope (SEM) clearly showed the squeeze casting composite exhibits a good dispersion/matrix interface compared to that of the composites produced by gravity casting Composite, Corrosion, Gravity casting, Squeeze casting, Polarization 10 17 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-127-81&slc_lang=en&sid=1 A. Fattah-Alhosseini a.fattah@basu.ac.ir 180031947532846003166 180031947532846003166 Yes Department of Materials Engineering, Bu-Ali Sina University, Hamedan, Iran M. Ranjbaran 180031947532846003167 180031947532846003167 No Department of Materials Engineering, Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training S. Vajdi Vahid 180031947532846003168 180031947532846003168 No Department of Materials Engineering, Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training