Stainless steel with its beautiful appearance, corrosion resistance, not easy to damage the advantages of people's love. But when there are brown rust spots on the surface of stainless steel castings, people will be surprised: why does "stainless steel" rust? Rusty, is that still "stainless steel"? Is there something wrong with the material?
In fact, this is a one-sided wrong view of stainless steel, because stainless steel will rust under certain conditions.
Stainless steel has the ability to resist atmospheric oxidation, that is, it is not rusty, but also has the ability to corrode in the medium containing acid, alkali and salt, that is, corrosion resistance. However, the corrosion resistance of the steel varies with its chemical composition, additive state, service condition and environmental medium type. For example, 304 stainless steel casting has absolutely excellent corrosion resistance in dry and clean atmosphere, but if it is moved to the seaside area, it will rust quickly in the sea fog containing a lot of salt, while 316 material performs well. Therefore, not any kind of stainless steel, in any environment can be resistant to corrosion, rust.