Painting equipment production line manufacturer explains the role of metal surface painting

Painting equipment production line manufacturer explains the role of metal surface painting

Painting metal surfaces is a method of preventing metal oxidation and corrosion. The corrosion phenomenon around us refers to the damage, performance degradation, or deterioration of various materials under environmental conditions. Metal surface coating is an important means to prevent metal corrosion. A good paint protection layer can serve as a barrier to prevent the invasion of corrosive media.

The importance of painting metal surfaces:

Because corrosion is an irreversible spontaneous process, even high-quality coatings are difficult to protect metals from corrosion. Especially when the paint coating on the metal surface is poorly bonded, damaged, or has defects such as pinholes, bubbles, cracks, and peeling, the protective effect of the paint coating will be greatly reduced, and even lead to the aggravation of metal corrosion. Therefore, it is necessary to analyze the factors of paint corrosion and take effective measures to prevent it.

Corrosion mechanism of metals in spray painting:

Generally speaking, the corrosion of metals is the result of multiple factors working together, among which one factor plays an important role in the corrosion process. The coating protective layer is formed by spraying on the metal surface, and the corrosion area of the metal is located at the interface area between the coating film and the metal surface, continuously eroding and extending to the depth of the metal substrate.

If spraying coatings on metal surfaces can effectively isolate the penetration of water, oxygen, electrons, and stray ions, it can greatly slow down or avoid the corrosion of the sprayed metal. If the isolation effect is not good, the anti-corrosion and anti-corrosion protection effect of the coating maintenance layer on the metal is not good. Production practice has shown that the permeability of the spray paint protective layer seriously affects the adhesion of the metal spray paint surface, while the permeability seriously affects the corrosion performance of the metal. There are many forms of corrosion in painted metals, but the fundamental cause of corrosion is closely related to chemical and electrochemical interactions.