Why should stainless steel plate surface pickling, surface passivation

1. Pickling passivation is not soaked in acid, is the acid potion, in the stainless steel outside the formation of a protective layer, generally passivation liquid chromium salt formed by chromium, not the formation of oxide.

2. Pickling passivation is a complete chemical reaction that forms a passivation film on the surface of stainless steel. Stainless steel electrolytic polishing is a process in which metal ions separated from the workpiece and phosphoric acid in the polishing solution form a layer of phosphate film and adsorbed on the surface of the workpiece. This mucosa is thinner in the convex and thicker in the concave. The current density in the convex is high and dissolved fast. Pickling passivation is a general treatment of stainless steel parts, electrolytic polishing can make the surface of parts more smooth and bright, improve the external image. After pickling passivation and then electrolytic polishing, the original passivation film will be removed, which will not add the anti-corrosion properties of the two, and it is not necessary to use them together.

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