Different materials, the bonding force between the paint and the material will be different. The coating completed by the paint on the surface of the steel material adheres very firmly; instead of ferrous metals or non-metallic materials, the surface is not specially treated, and the coating is formed on the surface. The adhesion of the coating is not firm. There may be some reaction between the weak chemical properties of the material penalty itself and the physical and chemical properties of the coating composition., Compatible or insoluble, so the corresponding paint needs to be selected for surface coating of different materials.
For example, iron red phenolic, alkyd, epoxy vinyl or nitro primer are used for primers of steel materials, which have strong anti-rust ability or passivation effect. Zinc yellow epoxy ester primer is required for aluminum and aluminum alloy surfaces. The primer of bridge towers generally adopts Danhong anti-rust primer and zinc-rich primer. Chlorinated rubber primer is used for concrete surfaces. Water-based latex paint is used for interior and exterior wall surfaces of buildings to achieve moisture resistance and alkali resistance.
Various types of coatings generally have very good adaptability to steel, followed by non-ferrous metals, while for non-metals, such as wood, textiles, plastics, paper, leather, glass, brick walls, cement concrete surfaces, etc. For coating, it is necessary to reasonably select the corresponding coatings according to the nature of different materials. Once improperly selected, it will inevitably lead to poor adhesion, no smooth and flat coating, cracks and falling off. Even with professional construction equipment and environment, superb operating skills are of no avail, and the purpose of product coating is often in vain because the requirements cannot be achieved.
