Passivation: poor pickling passivation passivation will result in uneven or very thin passivation films on the stainless steel surface, which are very susceptible to electrochemical corrosion. Clean-up: residual pickling passivation passivation residues and organic chemical corrosive substances of stainless steel, and its stainless steel parts electrochemically corrosive substances. To put it simply, because of its unique steel structure and surface air oxide film, stainless steel is generally unable to produce chemical changes with the corroded medium, but it is not easy to be corroded under all standards.

The corrosion principle of stainless steel parts is mainly electrochemical corrosion. In the presence of corrosive media and cause elements, such as scratches, spatter, laser cutting slag, etc., stainless steel will suffer corrosion because of the slow organic chemical and electrochemical corrosion with corrosive media, even in some standards, the corrosion rate is very fast, resulting in corrosion conditions, especially crevice corrosion and interstitial corrosion.

Thus in the production process of stainless steel goods should be used in all reasonable countermeasures to try to prevent molten precision casting rust and cause rust. In fact many rusting media and the onset of the cause of the appearance of the quality of the equipment is also a relatively serious adverse hazard, should and must get rid of them.

The advantages of passivation: in contrast to the traditional physics of sealing the way, the passivation process has the characteristics of not enhancing the thinness of the product workpiece and not losing colour, which enhances the accuracy and added value of the enterprise's products and makes the actual operation more convenient. Because the entire passivation process is achieved in a non-reflective situation, precision casting equipment can be repeatedly added and applied with passivating agents, resulting in a longer service life and more economical development of costs.