Yes, die-cast aluminum can be anodized. Anodizing is a process in which a layer of oxide is applied to the surface of the aluminum to improve its corrosion resistance and wear resistance, and to provide a decorative finish.

Anodizing is typically done on aluminum alloys that have a high purity and a high strength-to-weight ratio, such as 6061 and 7075. These alloys are well-suited for die casting, and are often used to produce parts and components that require high strength and corrosion resistance.

To anodize die-cast aluminum, the parts are first cleaned and prepared by removing any surface contaminants and defects. The parts are then immersed in an electrolytic solution and subjected to an electrical current, which causes the oxide layer to form on the surface of the aluminum. The thickness and properties of the oxide layer can be controlled by adjusting the parameters of the anodizing process, such as the electrical current and the concentration of the electrolytic solution.

Overall, anodizing can be a useful process for improving the corrosion resistance and wear resistance of die-cast aluminum parts and components. It can also be used to provide a decorative finish, such as a colored or textured surface.