Powder Coating Finishing Services
CYCOSPRAY offers high quality powder coatings for durable decorative finishes in custom colors and textures.
Overview of Powder Coating
A widely used surface coating technology that is very different from traditional liquid coatings. Powder coatings are powders consisting of solid particles that are electrostatically adsorbed onto the surface of a workpiece, then melted and cured during heating to form a solid coating.
Powder coatings are classified into two main categories: thermoplastic and thermosetting. Thermoplastic powder coatings can be softened by repeated heating in the molten state and hardened by cooling. Thermosetting powder coatings cannot be re-melted after curing and have better resistance to high temperature and chemicals.
As a whole, powder coating is a highly efficient and eco-friendly surface coating technology with a variety of application advantages for a wide range of industrial fields.
Processes of Powder Coating
- Surface preparation: Before coating, it is necessary to remove any grease, dirt and oxides that may affect the adhesion of the coating. This usually includes pre-treatment steps such as cleaning, descaling and phosphating.
- Pretreatment: To improve coating adhesion and corrosion resistance, some workpieces need to be pretreated, such as phosphating. The method of pretreatment depends on the characteristics of the coating and the workpiece.
- Coating: Applied to the surface of the workpiece by means of electrostatic spraying or electrode deposition. During the coating process, the powder particles are electrostatically charged and are attracted to the oppositely charged surface of the workpiece to form a uniform coating.
- Uniformity check: After coating, it is usually necessary to check the uniformity of the coating to ensure that the thickness and appearance of the coating meet the requirements.
- Curing: After coating, the workpiece needs to be cured in an oven or hot air circulating furnace. The curing temperature and time are usually determined by the type and formulation of the powder coating used. During this process, the powder particles melt and level off to form a solid coating.
- Cooling: After curing, the part needs to be cooled to room temperature. This stage is an important step to ensure that the coating is fully solidified and cured.
- Inspection and repair: A final inspection is carried out after the coating has cured. If defects are found in the coating, it may need to be repaired or recoated.
Benefits of Powder Coating
High Efficiency
Powder coating does not require drying and can go directly to the curing stage, which increases production efficiency. Moreover, there are no VOCs and no need for additional ventilation and exhaust gas treatment equipment.
Corrosion Resistance
Powder coating provides excellent corrosion resistance, protecting metal surfaces from oxidation, rust and other forms of corrosion.
Abrasion Resistance
Powder coatings are typically harder than traditional liquid coatings, providing better abrasion and scratch resistance and extending the life of the workpiece.
Wide Applicability
Powder coating is suitable for a wide range of substrates, including metals, plastics, and wood, and can be used to coat workpieces of all shapes and sizes.
Diversity of Coatings
Powder coating can achieve various coating effects, including matte, glossy, textured feel, and metallic feel to meet the aesthetic and functional needs of different applications.
Environmentally Friendly
Electroplating improves the appearance of workpieces by giving them the luster, brightness and smoothness of metal for applications that require enhanced visual appeal.