In terms of surface treatment, passivation is generally directed to generate a dense oxide film or compound on the surface of the \"object\
Sealing generally refers to the \"object\" after bluing treatment, phosphating treatment, oxidation treatment and other processes, used to fill the pores of the film layer after the above treatment, where there are both physical filling and chemical reactions, such as simple oil sealing, as well as soapy water sealing, with hot water sealing is the use of film layer and water reaction to generate crystal water to fill the pores (such as hot water sealing after aluminum anodizing). The closed film has better protective properties and anti-fingerprint properties.
Closure generally refers to the material after bluing treatment, phosphating treatment, oxidation treatment and other processes, used to fill the pores of the film layer after the above treatment, where there are both physical filling and chemical reactions.
Passivation refers to the process of metal oxidation by strong oxidizing agent or electrochemical method, so that the surface becomes inactive, that is, passivation process, is to transform the metal surface into a state that is not easy to be oxidized, and delay the corrosion rate of the metal. In addition, an active metal or alloy, in which the chemical activity is greatly reduced, and become a precious metal state phenomenon, also called passivation.
Compared with the traditional physical sealing method, the passivation treatment has the characteristics of absolutely not increasing the thickness of the workpiece and changing the color, improving the precision and added value of the product, and making the operation more convenient.