Is Corten Steel Rust Proof?

 

Steel Corten (Corten) is a weather resistant steel that can more appropriately be described as an atmospheric corrosion resistant steel. It is a copper chromium alloy steel – this alloy exhibits a greater level of resistance to atmospheric corrosion than other unalloyed steels.

As for corten steels, the rusting process occurs in the same way, but instead results in a more stable rust layer known as a patina, which adheres to the base metal and is less porous. When exposed to the weather, this naturally-developed patina regenerates continuously and creates a protective barrier that hinders the entry of oxygen, moisture and pollutants. 

Does this make corten steel rustproof? Not at all. Corten steel is left to rust in order to form a protective patina coating. While this results in a much lower corrosion rate compared to other steels, it does NOT make corten steel corrosion-proof. 

Corten sheet facade cladding naturally changes its appearance over time, it is resistant to atmospheric agents, producing an extraordinary oxide finish that protects it from corrosive phenomena. Rust creates a surface coat that regenerates continuously, allowing facade cladding to “protect itself,” making it an extremely durable and low-maintenance solution.

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