Effect of (MgO+SiC) on Corrosion and Mechanical Aspects of Al-Si Alloys

Tensile, micro hardness and corrosion behavior for al-4% si alloy reinforced by mgo and sic were studied. three composites were casting to produce al-4si/1mgo+2sic, al-4si/2mgo+1sic and al-4si/1.5mgo+1.5sic. the tensile strength results showed that (al-4si/2mgo+1sic) has the highest tensile strength compared with other composites, while (al-4%si/1.5mgo+1.5sic) showed the highest hardness .corrosion test results indicated that the corrosion potential attain noble value for all composites in comparison of al-4%si shown alloy in seawater under room temperature, where as the composite (al-4%si/2mgo+1sic) has highest corrosion resistance. reinforcement of al-4%si base alloy by additive ceramic materials did the current density decreased, especially with (al-4si/1mgo+2sic) which has the lowest corrosion rate compared with the other composites due to the role of sic effect on the current corrosion reduction.