Improvement of corrosion resistance: The core purpose of passivation is to significantly reduce the rate of corrosion of metals by forming a thin and stable oxide or passivation film on the metal surface, which effectively isolates the metal from direct contact with corrosive substances in the external environment (such as moisture, oxygen and chemicals).
Author: Anna
The main functions of passivation include the following.
Improvement of corrosion resistance: The core purpose of passivation is to significantly reduce the rate of corrosion of metals by forming a thin and stable oxide or passivation film on the metal surface, which effectively isolates the metal from direct contact with corrosive substances in the external environment (such as moisture, oxygen and chemicals). This protective film is usually very stable and protective, and can significantly improve the corrosion resistance of the metal in a variety of environments.
Enhanced metal stability: Passivation improves the stability of metals under extreme environmental conditions. For example, in harsh environments such as high temperatures, strong acids and alkalis, passivation films can effectively protect the metal substrate from erosion. This is particularly important for metal materials used in special applications such as chemical equipment and aerospace equipment.
Extending the service life of metals: With passivation, the corrosion rate of the metal surface is significantly reduced, thus extending the service life of the metal. This reduces the frequency of maintenance and replacement of metal parts, which is especially important for equipment and structures that are used for long periods of time.
Improved Appearance: Passivation films often have a gloss or transparency that enhances the finish and aesthetics of the metal. This is especially important for applications where appearance is important (e.g. decorative building materials, consumer products, etc.).
Reduced Maintenance Costs: Passivation can significantly reduce the need for maintenance due to metal corrosion. By forming a protective film, passivation reduces corrosion and contamination of metal surfaces, reducing the frequency of cleaning and maintenance.
Prevents galvanic corrosion: By forming an insulating passivation film on the metal surface, the flow of current in an electrochemical reaction can be blocked, thus reducing the occurrence of galvanic corrosion. This is an important protective role for passivation in certain industrial applications such as electrical equipment and electronic components.