The coating is considered to ensure the durability and corrosion resistance of the building. Different applications can meet the service life by selecting different coatings, coatings and thicknesses.
Plating, the general coatings for architectural color coatings are hot-dip galvanized and hot-dip aluminum-zinc. For color coating, the application fields of the two substrates are not much different, and in a relatively acidic environment, an aluminum-zinc-plated substrate is a better choice. For wet and alkaline environments, the advantages of the corrosion resistance of the galvanized substrate are reflected.
Coating, the top coats of commonly used coil coatings are polyester (PE), polyurethane (PU), silicon modified polyester (SMP), fluorocarbon (PVDF), and high weather resistant polyester (HDP).
For gloss, in the outdoor use of color coated panels, loss of light is the earliest phenomenon, especially for high gloss products, the initial loss of light will be very fast.
When the gloss is reduced to about 20, it will last for a long time. This phenomenon will occur in a few months of use. Therefore, the color coated panels for outdoor buildings are generally low-light.
According to the report and related corrosion test results, the front coating layer of 20 μm or more can effectively prevent the intrusion of corrosive media.
PVDF products require a thicker coating film. The requirements for the backside coating depend on the application. The sandwich panel requires only one layer of bondable primer.
The profiled steel sheet is also required to be coated with two layers due to the indoor corrosive environment and has a thickness of at least 10 μm.
