The main roles of passivation processes include improving corrosion resistance, enhancing metal stability, extending service life, improving appearance quality, reducing maintenance costs and preventing galvanic corrosion.
Author: Anna
The main roles of passivation processes include improving corrosion resistance, enhancing metal stability, extending service life, improving appearance quality, reducing maintenance costs and preventing galvanic corrosion.
Improve corrosion resistance: The main purpose of passivation is to enhance the corrosion resistance of the metal. Through the formation of a thin and stable oxide film on the metal surface, the passivation film can effectively isolate the metal from direct contact with corrosive substances in the external environment (e.g. moisture, oxygen and chemicals), significantly reducing the corrosion rate of the metal.
Enhance the stability of the metal: Passivation treatment can improve the stability of the metal in 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 metals used in special applications such as chemical equipment and aerospace equipment.
Extended service life: Through passivation, the corrosion rate of the metal surface is significantly reduced, thus extending the service life of the metal. The formation of a passivation film effectively slows down the corrosion process of the metal, reducing the frequency of maintenance and replacement of metal parts.
Improved appearance: Passivation also improves the appearance of the metal. Passivation films are often glossy or transparent, which 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. This is important for equipment and structures that need to be kept in good condition for a long period of time, helping to reduce maintenance costs and prolong equipment operation.
Prevents galvanic corrosion: Passivation also prevents galvanic corrosion. By forming an insulating passivation film on the surface of the metal, 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 power equipment and electronic components.