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New question! Why does stainless steel rust?
Time:2020-05-21 Source: Hits:

The common stainless steel in our lives is also called chrome steel alloy. Have you ever wondered whether stainless steel really does not rust? The answer to this question is very simple, and it will definitely rust. I do n’t believe you go to see those old stair handrails, or those stainless steel railings that are exposed to the sun and rain.

 

The reason why stainless steel is called a steel alloy that does not rust is because compared with other steel alloys, its probability and probability of rusting are much lower, giving a feeling of not rusting and having a bright Glossy, but everything has a shelf life, and the metal will eventually rust.

 

Then new questions arise, why does stainless steel rust?

 

We must first understand that the low rust rate of stainless steel mainly depends on the chromium alloy it contains, because the chromium alloy will form an oxide film on the surface of the stainless steel to help the stainless steel resist the erosion of oxygen and other chemical element ions in the air. Once this oxide film is damaged, the stainless steel will soon be eroded and rusted. Therefore, if you want to maintain the performance of stainless steel, you must try to protect the stainless steel oxide film.

 

316L stainless steel

316L stainless steel


In addition, the wrong choice of stainless steel will also cause the stainless steel to rust. For example, if you want to be beautiful in the outdoor environment, you need to use stainless steel containing nickel. Therefore, 304 stainless steel is widely used in curtain walls, roofs and other construction purposes, but in severely erosive industrial buildings or offshore areas, 304 is no longer The best option is to use 316 stainless steel. When constructing a pharmaceutical factory or manufacturing medical equipment, when working in a sterile environment, antibacterial stainless steel should be selected instead of general industrial stainless steel.

 

304 stainless steel

304 stainless steel


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