The main difference between electro galvanized zinc passivation and no passivation is the surface treatment and corrosion resistance.
Author: Anna
The main difference between electro galvanized zinc passivation and no passivation is the surface treatment and corrosion resistance.
Surface treatment is different:
Electro-galvanizing is the process of electroplating zinc onto a substrate to form a coating, whereas depassivation simply forms a zinc coating on the surface of the metal material.
Passivation is on the basis of zinc plating, and then a chemical treatment, so that the surface of the formation of a harder layer of oxidation, thereby increasing the corrosion resistance of the metal material.
Corrosion resistance is different:
Passivation enhances the corrosion resistance of electroplated zinc. The zinc oxide layer on the surface after passivation is denser and more difficult to be eroded by the external environment than galvanized zinc, and therefore has better corrosion resistance.
Electroplated zinc without passivation is susceptible to rusting in wet or corrosive environments, thus affecting its service life.
Application Scenarios:
Passivation is widely used for stainless steel, aluminum alloys, galvanized steel and other metal materials, and can improve the precision and added value of products without increasing the thickness of the workpiece or changing the color of the workpiece.
Without passivation treatment is suitable for some application scenarios that do not require high surface treatment, but its corrosion resistance is poor, and it needs to pay attention to protection in the process of use.