Now stainless steel pipe is very popular, many daily necessities are stainless steel, it is because of its corrosion resistance, the following is a brief introduction to its corrosion resistance, everyone take a look at it. Most metals react against oxygen
Now stainless steel pipe is very popular, many daily necessities are stainless steel, it is because of its corrosion resistance, the following is a brief introduction to its corrosion resistance, everyone take a look at it.
Most metals and oxygen will react, forming an oxide film on the surface, and the iron oxide formed on ordinary carbon steel continues to oxidize, so that the rust continues to expand, and eventually form holes, can be used to paint or oxidization-resistant metals (such as zinc, nickel and chromium) electroplating to ensure the surface of carbon steel, but, as people know, this protection is only a film, If the protective layer is destroyed, the stainless steel pipe will begin to rust. The corrosion resistance of stainless steel pipes depends on chromium, but because chromium is one of the components of steel, the protection methods are not the same.
When the amount of chromium added reaches 10.5%, the atmospheric corrosion resistance of the steel is significantly increased, but when the chromium content is higher, although the corrosion resistance can still be improved, it is not obvious, because when the steel is alloyed with chromium, the type of surface oxide is changed into a surface oxide similar to that formed on the pure chromium metal, and this tightly adhered chromium-rich oxide protects the surface. To prevent further oxidation, this oxide layer is extremely thin, through which you can see the natural luster of the steel surface, so that the stainless steel pipe has a unique surface,
If the surface layer is damaged, the exposed steel surface reacts with the atmosphere to repair itself, re-forming this "passivation film" that continues to play a protective role. Therefore, stainless steel has a common characteristic, that is, the chromium content is more than 10.5%.
