How do cast iron outdoor sculptures handle exposure to high-sulfur coal pollution?

Cast iron outdoor sculptures are known for their durability, but exposure to high-sulfur coal pollution can pose challenges. Sulfur dioxide (SO2) from coal combustion reacts with moisture in the air to form sulfuric acid, which accelerates corrosion on iron surfaces. Over time, this can lead to pitting, rust, and surface degradation.

To mitigate these effects, many cast iron sculptures are coated with protective layers such as paint, wax, or specialized sealants. Regular maintenance, including cleaning and reapplying protective coatings, is essential to prolong their lifespan. Additionally, placing sculptures in sheltered areas or using corrosion-resistant alloys can reduce damage.

Despite these risks, cast iron remains a popular material for outdoor art due to its strength and aesthetic appeal. Proper care ensures these sculptures endure even in polluted environments.