1. Steel factor: that is, the internal alloy composition of stainless steel. In fact, stainless steel is an alloy. However, the size of the surface roughness. Determines whether it is easy to rust. Because the smaller the surface roughness is, the smaller the surface roughness is. From the microscopic level, the area in contact with the air is smaller, so it is not easy to be oxidized.
2. Processing technology factors: stainless steel does not rust. It is because oxygen is combined on its surface to form a passivation film (that is, an oxide film). The formation of the passivation film during processing, such as a small extension of a leveling machine, a small amount of grinding by a grinding machine, etc. All can cause the formation of oxide film, of course, including the annealing of bright annealing furnace under the protection of full hydrogen, a passivation film can be well formed. Of course, when processing and producing stainless steel, there are many reasons that easily cause stainless steel to rust, such as the high content of thiophane in the grinding oil and so on.
