Metal sculptures exposed to outdoor environments face significant threats from acid rain and saltwater corrosion, which can degrade their appearance and structural integrity over time. To safeguard these artworks, several effective strategies can be employed.

1. Protective Coatings: Applying specialized coatings like wax, lacquer, or epoxy creates a barrier against moisture and corrosive elements. Regular reapplication ensures long-term protection.

2. Galvanization or Powder Coating: These industrial-grade treatments provide durable, rust-resistant surfaces, ideal for sculptures in harsh climates.

3. Regular Cleaning: Gently washing sculptures with mild soap and water removes corrosive residues. Avoid abrasive tools to prevent surface damage.

4. Environmental Adjustments: Positioning sculptures under shelters or using protective covers minimizes direct exposure to rain and salty air.

5. Material Selection: Opting for corrosion-resistant metals like stainless steel or bronze reduces vulnerability from the outset.

By combining these methods, artists and collectors can preserve metal sculptures for generations, maintaining their beauty despite environmental challenges.