Corten steel has become a popular choice for gas fire pits, and for good reason. Its natural weathering process creates a stunning rust-colored patina that not only adds visual appeal, but also protects the steel from further corrosion. In this article, we’ll delve into the reasons why Corten steel is a great choice for your fire pit and explore its unique characteristics.
How Corten Steel Develops Its Protective Rust Layer
Unlike ordinary steel, which rusts and deteriorates over time, Corten steel is designed to form a stable layer of rust. This layer, known as patina, acts as a natural barrier, preventing further oxidation and extending the life of the steel. Before it weathers, it looks like raw steel with a mill scale or a grayish film. On a fire pit, you see the weld marks and seams for a very industrial vibe.
Then the process begins when the raw steel is exposed to the elements, such as rain, snow, and humidity. The iron in the steel reacts with oxygen and water, forming a thin layer of rust. This layer then becomes denser and more resistant to further corrosion as it is exposed to more elements.
The Role of Weather in Corten Steel’s Patina Development
All weather conditions play a role in the development of Corten steel’s patina. Rain and snow contribute moisture, which is essential for the chemical reaction that creates rust. Sun exposure accelerates the process by increasing the temperature and causing the steel to expand and contract, which creates tiny cracks in the surface. These cracks allow more oxygen and water to reach the steel, promoting rust formation. Even in drier climates, such as deserts, the slight humidity in the air is enough to initiate the weathering process. However, the patina will develop at a slower pace in these conditions. You might want to consider all of these weather factors and the location in which you live.
Pre-Weathering Corten Steel: An Option to Consider
If you prefer a specific look for your Corten steel fire pit, we can pre-weather it using a vinegar, salt, and peroxide solution. This process artificially accelerates the natural weathering process, allowing you to achieve the desired patina in a shorter period. However, it’s important to note that pre-weathered Corten steel may experience some runoff, especially in the early stages.
To minimize this, you can clean it with WD-40 which actually reduces the runoff, but it will also darken the appearance. If you go this route, be sure to let it dry for a few hours before lighting it after using the WD-40. Another option is to spray the fire pit with a hose before placing it in the final location. For those who prefer a pristine look and want to completely avoid runoff, consider applying a clear coat sealant like the ones offered by Everbrite Coatings. Keep in mind that this will slightly change the natural appearance of the patina.
The Benefits of Corten Steel for Fire Pits
- Zero Maintenance: Once the patina has formed, corten steel requires no additional maintenance. You can simply enjoy its beauty without worrying about painting or rust prevention.
- Long-Lasting Durability: The protective rust layer makes corten steel incredibly durable, ensuring that your fire pit will withstand the elements for many years to come.
- Unique Aesthetic: The rich, rust-colored patina of Corten steel adds a unique and rustic charm to any outdoor space.
Additional Considerations for Your Corten Steel Fire Pit
When setting up your new Corten steel fire pit, there are a few extra factors to keep in mind. Corten steel is a robust material, even in challenging environments. But Coastal regions, with their salty air, can actually accelerate the patina formation process. However, regular rinsing with fresh water is recommended to prevent excessive corrosion and maintain the fire pit’s longevity. If you’re seeking a truly maintenance-free option with a similar aesthetic, powder-coated aluminum fire pits in Rustic Bronze finishes offer a cleaner look that can better withstand the coastal elements.
In Conclusion
Corten steel is an excellent choice for gas fire pits, offering a combination of beauty, durability, and low maintenance. That’s why it’s a material typically used on bridges. Its natural weathering process creates a unique patina that adds visual appeal and protects the steel from further corrosion. Whether you choose to pre-weather your fire pit or let it develop its patina naturally, you can be confident that it will be a long-lasting and eye-catching addition to your outdoor space.
