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The advantages of the passivation

by:Waxing     2020-10-06
1, compared with the traditional physical method, after passivation treatment is absolutely do not increase the thickness of the workpiece and the characteristics of change color, improves the precision and value-added products, make the operation more convenient. 2 is no reaction, because of the passivation process, the passivation agent can be used repeatedly, so the cost of living longer, more economical. 3, passivation prompted oxygen molecules structure of metal surface passivation membrane, membrane layer of dense, stable performance, and in the air at the same time have repair effect, so compared with the traditional method of tu rust-proof oil, passivation formation of the passivation film is more stable, more corrosion resistance. Metal or alloy is influenced by some factors, chemical stability significantly enhanced phenomenon, called passivation. By certain passivation agent ( Chemicals) Caused by the metal passivation phenomenon, known as chemical passivation. Such as concentrated HNO3, thick - H2SO4, HClO3, K2Cr2O7 and KMnO4 antioxidant can make metal passivation. Metal passivation, the electrode potential to the moving direction, make it lost the original features, such as the passivation of iron can't to the replacement of copper in the copper salt. In addition, electricity chemistry method also can make the metal passivation, such as puts Fe - H2SO4 solution as anode, with impressed current anode polarization, the instrument must be make the iron potential rise to a certain extent, Fe passivation. Metal passivation phenomenon caused by anodic polarization, is called the anode passivation or electrochemical passivation.
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