How Does Color Coated Steel Plate Achieve Anti-corrosion?

Color coated steel plate is also a color coated steel plate, which is the result of the joint action of coating, pre-treatment layer, primer, and topcoat. We call it the "four in one anti-corrosion system of color coated steel plate". So how does color coated steel plate achieve anti-corrosion?
The coating of color steel plate plays a sacrificial anti-corrosion role, which is simply to prolong the service life of the steel plate by continuously consuming its own coating. Of course, the type, quality, and thickness of the coating are key factors in the length of coating consumption time. Tongmeng color coated steel plate mainly adopts galvanized, aluminized zinc, galvanized aluminum magnesium and other coated steel plates from large domestic steel plants, with higher strength and better resistance to pitting corrosion.
Let's talk about the pre-treatment layer again. This is a crucial aspect of anti-corrosion for color steel plates, which is often overlooked. The pre-treatment layer, also known as the passivation layer, requires the use of passivation solutions such as phosphate or chromate to passivate the surface of the substrate before color coating. On the one hand, it plays a role in increasing the adhesion of the coating and on the other hand, it plays a role in resisting pitting corrosion. Research has shown that in the neutral salt spray resistance experiment of galvanized color coated plates, the contribution rate of the pre-treatment layer quality reaches over 60%.
Let's talk about the primer again. On the one hand, the primer plays a role in increasing the adhesion of the coating. After the paint film is permeable, it will not detach the coating, preventing it from foaming and falling off; On the other hand, due to the presence of slow-release pigments such as chromate in the primer, it can passivate the anode and improve the corrosion resistance of the coating.
Finally, let's talk about topcoat. In addition to aesthetics, topcoat mainly serves to block sunlight and prevent UV damage to the coating. After the topcoat reaches a certain thickness, it can reduce the generation of micropores, thereby shielding the penetration of corrosive media, reducing the water and oxygen permeability of the coating, and preventing coating corrosion. The UV resistance and density of different coatings vary, and for the same type of coating, film thickness is a key factor affecting corrosion. Acai coating board is made of brand paint cured at high temperature, with superior corrosion resistance and fading resistance