Several Processes of Pickling and Passivation of Stainless Steel Plate Surface

When the surface of the stainless steel plate has no annealed color (such as the surface after welding), the residual drilling emulsion, the anti-rust film or the ferrite after the forming process is impregnated with stainless steel, it will have a direct impact on the corrosion resistance of the stainless steel material. At this time, it is necessary to use an acid degreasing agent to clean and maintain the surface of the stainless steel plate.

Stainless steel pickling passivation treatment can completely remove impurities and promote the formation of a new passivation layer, which is a complete chemical reaction process. It can not only clean the surface of the stainless steel plate, but also make the surface of the treated stainless steel plate form a completely uniform silvery white. Depending on the actual task, different pickling products can be used for stainless steel plates with different structures and surface sizes.
Let’s take a look at the stainless steel pickling passivation paste first. This product is used to treat the stainless steel plate with a relatively large surface or the color of the welding spot and oxide layer around the surface weld. As long as it is evenly applied on the surface of the stainless steel plate, wait until The surface of the stainless steel plate is completely uniform and white.
The second is the stainless steel pickling passivation solution, which is mainly used for pickling of small serial parts. This kind of product is easy to soak, usually soaking in a plastic container at room temperature, and even high-efficiency pickling and passivation can be completed simultaneously, such as stainless steel After the surface of the board is pickled and passivated, the highest resistance to salt spray can reach about 500 hours.
In addition to pickling spray, this process is suitable for pickling large areas of stainless steel plate surfaces (including external wall panels, containers), and can also be used for non-removable structures or difficult-to-access structures, such as bridge components. A pickling spray can improve application control.
There is also ablation pickling, which can remove the tensile and internal stress of the stainless steel plate material by specifically removing the surface of 3-5 microns, and can also remove the microcracks on the surface.
But no matter which process is used, the surface acid after treatment must be completely cleaned, preferably using high-pressure cleaning.