The adhesion, corrosion resistance and corrosion resistance of different primers are different. Epoxy resin has excellent adhesion and corrosion resistance to substrate, but its corrosion resistance is not as good as other primers. Polyester has excellent
adhesion and corrosion resistance to substrate, but its corrosion resistance is not as good as epoxy resin.
Polyurethane is an excellent induction primer. The primer is usually selected by the supplier according to the production process, application, corrosion environment and matching relationship with the topcoat. Corrosion resistance usually increases with
the increase of coating thickness. The coating thickness shall be determined based on corrosion, service life and environmental durability.
Different types of topcoats differ in hardness, flexibility, adhesion and durability. Polyester is the most
widely used coating, with excellent durability, excellent hardness and durability, and moderate price. Silicon modified polyester has high durability, luster and color retention, but its durability is slightly reduced, and high weather resistant polyester
has high cost performance.
Polyvinylidene fluoride (PVDF) has excellent durability and durability, but its hardness is low, it can be obtained with several colors and high price. The finishing coat of color coated plate is mainly affected by coating,
environmental corrosion, service life, durability, processing method and deformation degree.