Shandong color steel coil manufacturers: color steel coil with what material is better?

Shandong color steel coil manufacturers said, the substrate of color steel coil can be cold rolled coil or hot plated steel, although the organic coating part of the color coil material has good anti-corrosion effect, but the organic coating still has some small gaps, the air and moisture may enter and lead to rusting of the substrate, therefore, the color coated coil made of uncoated substrate has a short service life, and it is easy to diffuse after being scratched and lead to the coating falling off, and the substrate of the color coated sheet coil is galvanized Steel plate or galvanized metal alloy steel plate technology, in some production lines, color coating production process is divided into substrate pretreatment, chemical conversion film (non-organic metal coating), organic non-metallic coating and post-coating process.

Shandong color steel coil manufacturers said that the pretreatment of substrate galvanized steel as a substrate, if we are not a company that can directly and economically into the community, after the production into the color coating process, corrosion (white rust), dust, and other contamination may keep appearing in the process of transport development, if these can not be removed, it will affect the quality of the paint, the quality of the finished product of the color coated sheet roll and the physicochemical of all students Properties are closely related to the pretreatment, in addition, in the galvanized production, in order to prevent rust and oil coating, these oils are also removed before the color coated production, at present, we use more pre-treatment is degreasing with lye.

Chemical conversion film has two functions: 1. to further improve the rust prevention ability; 2. to improve the adhesion between the substrate and the coating, and improve the coating performance of the substrate.

There are usually three steps:

1. For phosphating, first form a large number of crystals on the metal surface, and then use the phosphating solution to form a phosphating film on the metal surface;.

2. Passivation and sealing, there are some holes in the phosphate film, chromate reacts with the holes to form a protective film.

3. Cleaning with pure water, use desalination or deionized water to remove the passivation solution.

Shandong color steel coil manufacturers said, organic paint organic paint is mainly divided into primer and top coat, primer requirements are not high, can be painted color, but in order to improve the security of the production information, primer and top coat are generally reverse coating.

Post-coating process: post-coating process includes printing, embossing, peeling protective film, bonding, etc., which improves the decorative and protective properties of color coated sheet, in addition, for some foreign coating technology, cold rolling and galvanized production line is used in the leveling and straightening process.