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What is the reason why stainless steel does not rust?

2023-11-25

What is the reason why stainless steel does not rust?

The main reason why stainless steel does not rust easily is that it contains chromium and forms an oxide film. The following are the reasons why stainless steel does not rust:

The role of chromium: The main alloying element in stainless steel is chromium, which usually contains at least 10.5% chromium. The presence of chromium enables the formation of a dense and stable oxide film (Chromium Oxide) on the steel surface. This oxide film prevents direct contact between oxygen and water, thereby slowing down the corrosion process of the steel.

Protection of oxide film: The oxide film is a transparent, thin protective layer that not only prevents the erosion of oxygen and water but also helps prevent the invasion of other corrosive substances. Even when the surface is slightly worn or scratched, a new oxide film can be quickly regenerated under the action of oxygen.

Self-healing: When slight scratches or corrosion occur on the surface of stainless steel, the action of chromium and oxygen allows the oxide film to repair itself and maintain its corrosion resistance.

Reinforcement of other alloying elements: Stainless steel often contains other alloying elements, such as nickel, molybdenum, etc., which can further improve corrosion resistance, especially in specific environments, such as seawater, acidic media, etc.

Surface treatment: The surface of stainless steel may undergo special treatments, such as polishing, pickling, etc., to improve its surface finish and corrosion resistance.

Generally speaking, the reason why stainless steel is not easy to rust is that its chemical composition and the oxide film formed on the surface provide an effective protective layer to prevent corrosion and oxidation of the steel surface. This allows stainless steel to maintain its appearance and performance over time in wet, corrosive environments.

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