The addition of silicon to aluminum alloys significantly enhances their properties. Silicon increases the alloy's fluidity, which is beneficial for casting processes, leading to improved casting quality. It also raises the alloy's resistance to corrosion, particularly in marine environments. Furthermore, silicon additions can improve the alloy's mechanical properties, such as strength and hardness, without significantly compromising ductility. This makes the alloy more suitable for applications requiring wear resistance. However, it's important to note that excessive silicon can lead to a decrease in the alloy's toughness and increase the risk of hot cracking during casting.