Why is cast iron outdoor seating rarely anodized like aluminum?

Cast iron outdoor seating is rarely anodized like aluminum due to fundamental differences in material properties and finishing techniques. Anodizing is an electrochemical process that creates a protective oxide layer, but it is primarily effective for aluminum, which naturally forms a thin oxide coating. Cast iron, however, lacks this property and is more prone to rust, requiring alternative protection methods like powder coating or galvanization.

Additionally, cast iron's porous surface makes anodizing impractical, as the process relies on a smooth, conductive surface. Aluminum's lightweight and corrosion-resistant nature makes it ideal for anodizing, while cast iron's strength and weight are better suited for other finishes. For outdoor durability, cast iron often relies on paint or enamel coatings to prevent rust, whereas anodized aluminum excels in corrosion resistance without added layers.

Ultimately, the choice between materials depends on aesthetic preferences, maintenance requirements, and environmental exposure. While anodized aluminum offers low-maintenance longevity, cast iron provides a classic, sturdy appeal with different protective treatments.