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The reason why stainless steel is anti-rusting

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The reason why stainless steel is anti-rusting

2020-01-08
All metals will have a reaction with oxygen in the atmosphere, forming the oxidation film on its surface. Unfortunately, the ferric oxide on the surface of general carbon steel will keep oxidizing and the rusting areas will keep expanding, finally forming a hole. We can add oil painting or electroplate the metals of oxidation-resistance (like zinc, nickle and chrome) to protect the metals. However, like what we know, this kind of protection is just a thin film. Once this thin film is destroyed, the steel underneath will get rusted.
The corrosion resistance of stainless steel is up to the chrome which is the part of steel and requires different protection method. When the content of chrome is up t0 10.5%, the corrosion resistance of steel will increase sharply. When the chrome content is more higher, the corrosion resistance will not be obvious even though it can be better. When the chrome is making alloying processing to the steel, it can transform the type of surface oxide to that on the pure chrome. This oxide film is very thin and the natural glory of the steel can be seen through this film. And even if the film is destroyed, the exposed steel surface can react with the atmosphere to form a kind of “passive film”, keeping protecting the steel.
All the stainless steel have a common: the content of chrome is more than 10.5% and that’s the reason why they are of corrosion-resistance.
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