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Why can stainless steel resist corrosion
When many metals react with oxygen in the atmosphere, an oxide film forms on their surfaces. Unfortunately, the iron oxide that forms on ordinary carbon steel continues to oxidize, causing the rusting to expand continuously and eventually forming holes. To prevent this from happening, a coating of paint or an electroplated layer of resistant metals (such as zinc, nickel, and chromium) is usually applied to the surface of carbon steel.
As is known to all, this protection is merely a thin film. If the protective layer is damaged, the steel beneath will start to rust. When there is a need, there will be a solution. The application of stainless steel can perfectly solve this problem.
The corrosion resistance of stainless steel depends on the "chromium" element in its composition. Since chromium is one of the components of steel, the protection methods vary. When the chromium content reaches 10.5%, the steel's resistance to atmospheric corrosion significantly increases. However, when the chromium content is higher, although the corrosion resistance can still be improved, the effect is not obvious.
The reason is that when chromium is used to alloy steel, the type of the outer oxide is changed to be similar to the surface oxide formed on pure chromium metal. This tightly adhered chromium-rich oxide protects the surface and prevents further oxidation. This oxide layer is extremely thin, allowing the natural luster of the steel outside to be seen through it, giving stainless steel its unique metallic appearance.
Furthermore, if the surface layer is damaged, the exposed outer part will react with the atmosphere to self-repair and re-form this "passivation film", continuously exerting a protective effect. Therefore, all stainless steels have a common feature, that is, the chromium content is above 10.5%.
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