Does Weather Affect Outdoor Stainless-Steel Tanks?
Stainless Steel Tanks
If you have an operation that utilizes outdoor stainless steel tanks, you may wonder just how well they hold up to the elements, such as rain and UV rays. Stainless steel is an exceptionally durable material that can last decades outside with the proper care and maintenance, but eventually, it will likely begin to show signs of wear and tear.
This article will discuss what you need to know about maintaining outdoor stainless steel equipment and tanks in order to prevent rust and ensure longevity.
General Maintenance Tips
If your operation is located in a region known for high humidity or salt air, outdoor stainless steel tanks will need to be rinsed often with fresh water (and mild soap if necessary). For additional rust protection, a thin layer of mineral oil or beeswax can be beneficial.
When exposed to direct sunlight, outdoor stainless steel will fade over the years. Darker steel colors, like black or dark brown, are more susceptible to this issue. To avoid fading, find a location on your property shaded as much as possible from direct sunlight. If no shady location is available, you can cover the tank with a lightweight, light-colored cloth.
How Long Can Outdoor Stainless Steel Last?
The lifespan of stainless steel (or steel in general) depends upon its environment. When located indoors and not exposed to moisture, it can last indefinitely. However, humidity and precipitation can affect outdoor stainless steel, accelerating the rusting process. Stainless steel may also last longer outdoors if coated with a protective layer of paint or zinc.
Proximity to salt water can accelerate corrosion as well, so those facilities along the coast may need to take special precautions for any outdoor tanks.
Soil with a high clay content and a high acidity can accelerate corrosion. A fluctuating water table near the surface can also result in condensation and increased corrosion rates.
Composition of Stainless Steel
Stainless steel is an alloy of iron, chromium, and nickel. It is very resistant to corrosion and can endure extreme temperatures, making it perfect for many applications, including construction projects and underground use. However, stainless steel will eventually deteriorate when exposed to the elements. The speed at which this occurs depends on the type of stainless steel and the environment it resides in.
There are three primary types of stainless steel: austenitic, ferritic, and martensitic.
Austenitic stainless steel contains chromium, nickel, and molybdenum, which make it resistant to corrosion from salt air or water.
Ferritic stainless steel contains less chromium and more carbon than austenitic, making it cheaper but also more vulnerable to corrosion.
Martensitic stainless steels are similar to ferritic but contain less carbon and more chromium.
The higher the chromium content, the better resistance to corrosion.
How Do You Keep Outdoor Stainless Steel from Rusting?
The chromium in stainless steel helps to prevent rusting. However, it can still rust if it is exposed to outdoor elements for an extended period of time. Those with outdoor stainless steel tanks should routinely clean them with a mild soap and water solution in order to remove any dirt or particles that could encourage rusting.
Applying a protective coating or coat of paint can also create a barrier between the metal and the elements.
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