What can be painted on galvanized steel sheet?
Zinc coating in the atmospheric environment after exposure, the surface will form a zinc salt (also known as white rust), before coating the paint, these zinc salts must be completely eliminated. The most effective treatment is the light sweep sand blasting method; if it is impossible to use sandblasting, you can use wire brushes or steel wool and full fresh water to remove zinc salts by mechanical cleaning and washing.
Paint matching1. The paint preparation system used for galvanized steel in soaking or humid environment must be alkali resistant and can not be saponified. Therefore, it is advisable to choose epoxy type coating. Best with epoxy zinc yellow primer.2, for exposure in the dry environment of galvanized steel, zinc yellow epoxy primer can be used with acrylic polyurethane topcoat, or intermediate epoxy zinc chromate primer + epoxy micaceous iron oxide + fluorocarbon topcoat with ultra weatherability, long service life of the supporting scheme.In short, surface treatment is very important, considering the durability of galvanized parts, it is recommended to use the above two kinds of matching paint to ensure the normal service life and reduce the cost of intermediate maintenance.
The surface of galvanized steel or galvanized iron sheet (also called galvanized iron sheet) is often stained with grease or antirust oil. It must be removed by solvent or detergent, and then the surface treatment method is adopted. Usually use a primer thinner to clean the surface.
