How do aluminum figurative sculptures resist degradation from acid rain compared to limestone?

Aluminum figurative sculptures exhibit superior resistance to acid rain degradation compared to limestone due to their inherent material properties. When exposed to acidic precipitation, aluminum forms a protective oxide layer that prevents further corrosion, while limestone chemically reacts and erodes over time. The non-porous nature of aluminum also prevents moisture absorption, unlike limestone's porous structure which accelerates weathering. Modern aluminum alloys used in sculptures often include additional protective coatings, further enhancing their durability in outdoor environments. This makes aluminum sculptures a preferred choice for public art installations in urban areas with higher pollution levels, where they maintain their structural integrity and aesthetic appeal for decades with minimal maintenance.