The role of surface treatment before paint spraying equipment
Remove all dirt (such as oil, rust, scale, dust, molding sand, welding slag, salt and alkali spots, etc.) on the surface of metal workpieces and use chemical methods to generate a non-metal conversion film that is beneficial to improve the corrosion resistance of the workpiece The treatment process is collectively referred to as metal surface treatment.
Surface treatment is one of the main processes of electrophoretic coating. The quality of the surface treatment directly affects the quality of the paint film and the service life of the workpiece after electrophoretic coating, so it must be paid great attention.
First, the purpose of surface treatment before painting
Remove grease, oil stains, corrosion products, residual impurities, etc. on the surface of the coated object, and give the surface certain chemical and physical characteristics to increase the adhesion of the paint layer and increase the protection and decoration of the coated object. The importance of surface treatment before painting is to provide a clean painted surface, improve the adhesion of the paint coating, and generate a non-conductive non-metallic chemical conversion film, which can also improve the coating's corrosion resistance (improve the More than double)
Classification of surface treatment before painting
1. Classification by processing method
Mechanical method (manual method, power tool, flame method, sand blasting, shot blasting);
Chemical method (oil removal, rust removal, surface adjustment, phosphating, passivation).
2. Classified by processing material
Metal materials (steel materials, non-ferrous metal materials);
Non-metallic materials (plastic, wood, cement).