1. Stainless steel passivation, this process is recommended that the surface must be iron free. The presence of stainless steel particles on the surface of any iron, cast iron, low carbon steel, medium carbon steel or low alloy steel will promote the pitting of "free" iron and stainless steel on its surface. This is a very serious problem, so passivation is only used to deal with stainless steel and stainless iron. The main purpose of stainless steel passivation is to prevent the surface of stainless steel from oxidation and corrosion.
2. Stainless steel pickling
The purpose of stainless steel pickling treatment is to remove the oxide scale on the surface of stainless steel after high temperature welding, heat treatment or hot processing. At the same time, it can also eliminate the red rust corrosion of steel or iron or steel particle pollutants. Please note that if the acid solution on the surface is not cleaned after pickling, the surface will soon start to rust and corrode. This leads to a reduction in the ductility of the underlying steel surface layer. Stainless steel pickling process can be applied to the surface treatment of all 200, 300 and 400 series stainless steels. All pickling operations result in a slight size change while removing impurities from the metal surface. Therefore, the result is that to a certain extent, an extinction of visual brightness may also be a significant reduction in size. Heat treatment in vacuum or a good controlled atmosphere, such as bright annealing, eliminates the need for pickling, which usually makes stainless steel get a better polished surface.
3. Degrease and degrease the stainless steel cleaning agent. The pretreatment of any process of stainless steel surface treatment must first remove grease, cutting fluid, drawing compounds and other lubricants, and then passivation treatment before surface heat treatment of stainless steel parts can be carried out. Stainless steel parts must also be further welded before degreasing treatment to prevent carbon in the picker at high temperature. Usually, stainless steel cleaning agent is used. It only needs to soak at room temperature for 1-8 minutes to remove any oil stain. It has simple operation, low labor intensity, and can be recycled repeatedly, effectively reducing production costs. In the cleaning operation with other metals, the cleaning rate can be increased by using brushing, spraying or stirring.
