Untreated metal sculptures are prone to oxidation, which can degrade their appearance and structural integrity over time. To preserve these artworks, several effective methods can be employed.

1. Environmental Control: Keep sculptures in a dry, low-humidity environment to minimize exposure to moisture, a primary catalyst for oxidation. Indoor display or climate-controlled spaces are ideal.

2. Protective Coatings: Apply wax, lacquer, or specialized metal sealants to create a barrier against air and moisture. Regular reapplication ensures ongoing protection.

3. Regular Cleaning: Remove dust, dirt, and pollutants with a soft cloth or brush. Avoid abrasive materials that could scratch the surface and accelerate rusting.

4. Use of Desiccants: Place silica gel packets or dehumidifiers near sculptures to absorb excess moisture in the surrounding air.

5. Avoid Direct Contact: Elevate sculptures on non-reactive stands (e.g., rubber or plastic) to prevent ground moisture absorption and reduce corrosion risk.

By implementing these strategies, artists and collectors can significantly extend the lifespan and beauty of untreated metal sculptures.