The principle of passivation treatment can be explained by the thin film theory, that is, when the metal and oxidizing substances act, a very thin, dense, well-covered passivation film is generated on the metal surface.
Author: Anna
The principle of passivation treatment can be explained by the thin film theory, that is, when the metal and oxidizing substances act, a very thin, dense, well-covered passivation film is generated on the metal surface.
This film is usually a compound of oxygen and metal, can be firmly adsorbed on the metal surface, play a role in isolating the metal and corrosive media, thus preventing direct contact between the metal and corrosive media, so that the metal basically stops dissolving, to achieve the effect of corrosion prevention.
The process and effect of passivation treatment
Passivation treatment usually includes the following steps:
Acid washing: remove oxides and dirt on the metal surface.
Water rinsing: to remove the acid residue after pickling.
Rinsing: further removes residual water after water rinsing.
Passivation: Generates a protective film on the metal surface to slow down corrosion.
Application areas of passivation
Passivation treatment is widely used on various types of stainless steel parts, plates and their equipment. Its advantages include simple operation, ease of use and economy. In addition, passivation has applications in the field of automatic control, for example in fail-safe systems where the affected channel or all channels are switched to a safe state when a fault is detected, i.e. the channel is passivated.