There are the limitations of anodizing：

Not Suitable for All Alloys: Not all aluminum alloys are suitable for anodizing. Some may not form a stable or uniform oxide layer. The specific alloy and its composition can influence the anodizing process and the quality of the final finish.  

Can Affect Electrical Conductivity: The anodized layer increases the surface resistance of the aluminum, slightly reducing its electrical conductivity. This can be a critical factor in applications where electrical conductivity is essential.

Limited Thickness: The thickness of the anodized layer is typically limited. While it provides excellent corrosion resistance, it may not be sufficient for applications requiring extremely thick or heavy-duty protection.  

Can Affect Dimensional Accuracy: Although minimal, anodizing can slightly increase the dimensions of the part due to the thickness of the oxide layer. This is important to consider in applications with tight tolerances.

Limited Color Options: While dyeing can produce a range of colors, the color palette for anodized aluminum is more limited compared to other surface treatments.  

Brittle Nature: The anodized layer can be brittle, making it susceptible to cracking or chipping under severe mechanical stress or impact.  

Environmental Impact: The anodizing process can generate chemical waste and require careful disposal to minimize environmental impact.