Passivation is a method of slowing down the rate of corrosion of a metal by converting its surface into a state that is less susceptible to oxidation. In addition, the phenomenon of an active metal or alloy, in which the chemical activity is greatly reduced to a state of noble metal, is also called passivation.
Passivation of metals in the environment is achieved in two ways:
1. Chemical passivation: mainly through the chemical reaction between the metal and strong oxidants, the formation of a dense film of oxides or other compounds on the surface of the metal, which covers the metal surface, isolating the metal from the solution, thus impeding the metal’s Continued oxidation and dissolution.
2. Anodic passivation: also known as electrochemical passivation, is as an anode of the metal or compound under the action of the current, to varying degrees, to lose the ability to transfer to the solution. Anodic passivation is caused by anodic polarisation of the metal passivation phenomenon, that is, the metal under the action of the current, its electrode potential changes and the formation of metal oxides or salts on the surface of the electrode, these substances are tightly covered in the metal surface to become a passivation film and Leads to metal passivation.
In general, although chemical passivation and anodic passivation both transform the metal surface into a state that is less susceptible to oxidation, their formation mechanisms and application backgrounds are different. Chemical passivation forms a protective film on the metal surface mainly through chemical reactions, whereas anodic passivation forms a passivation film on the metal surface through electrochemical processes, both of which are designed to retard the rate of corrosion of the metal.
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Post time: Aug-14-2024