Bronze and corten steel sculptures each possess unique weathering characteristics that influence their longevity and visual appeal. Bronze, an alloy of copper and tin, develops a natural patina over time when exposed to the elements. This greenish-blue oxidation layer, known as verdigris, protects the underlying metal from further corrosion while adding a timeless, classical aesthetic. The patina process can take decades but is often accelerated artificially for artistic effect.

In contrast, corten steel forms a rust-like surface when weathered, creating a striking reddish-brown appearance. Unlike typical rust, this layer stabilizes and acts as a protective barrier, preventing deeper corrosion. Corten steel reaches its final weathered look within 6-18 months of outdoor exposure, making it popular for contemporary installations seeking an industrial vibe.

Durability-wise, both materials excel outdoors but differ in maintenance needs. Bronze requires occasional waxing to preserve its patina, while corten steel needs no protective coatings once stabilized. Bronze maintains structural integrity for centuries, whereas corten steel's lifespan typically exceeds 50 years in most climates.

Artistically, bronze offers more intricate detailing possibilities but costs significantly more. Corten steel provides dramatic visual impact with lower material expenses, though its rust runoff can stain surrounding surfaces. The choice ultimately depends on desired aesthetics, budget, and willingness to embrace natural weathering processes.