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Electrostatic powder coating Product Overview: electrostatic powder coating is currently the fastest growing powder coating is an important construction technology, the basic principle is, between the gun and the workpiece to form a high-voltage corona discharge electric field, when the powder particles are composed of gun Koupen When out through the discharge area, they set up a large number of electrons and become negatively charged particles, in the electrostatic attraction of the role of the powder coating spray equipment to the surface of the workpiece is adsorbed onto positively charged piece up. When the powder is attached to a certain thickness, "same-sex repulsion" effect occurs, can not be adsorbed powder under electrostatic powder evenly adsorbed on the surface, forming a powder coating, powder coating after temperature baking leveling solidified into effect of different final coating, spray painting process is better than the mechanical strength, adhesion, corrosion resistance, anti-aging and so on. Process: Typical powder coating process is as follows: the piece → degreasing → washing → rust → washing → phosphate → washing → passivation → powder coating → curing → cooling → next item spraying distance: distance is repellent spray system One of the main parameters of film thickness, and the general control of 10 to 25 cm away from the workpiece, and more from the gun form to decide. Powder electrostatic spraying equipment includes: the powder room, high-voltage electrostatic generator, electrostatic spray gun, powder feeder, powder recovery, the workpiece rotation organizations. Spraying process: First, surface pretreatment: Pretreatment quality directly affects the quality of the powder coating, pre-treatment is not good, causing the film easy to fall off, bubbling and so on. Therefore, the first task must be stressed. (1) For sheet metal stampings by chemical pre-treatment method. Namely: to oil → rust → washing → phosphate (or purification) and the like. Most of rust or thick surface of the workpiece, sand blasting, shot blasting and other mechanical methods to rust. (2) putty. Scraping the workpiece defect level conductive putty, dried and sanded smooth, the next step can be carried out. (3) protection (also known as shield cover). If some parts of the workpiece does not require a coating before preheating can be protected, such as plastic covered up to avoid spray paint. (4) to warm up. Generally without preheating. If a thicker coating is requested, the workpiece may be preheated to 100 ~ 160 ℃, which can increase the coating thickness. Second, spraying: the workpiece into the powder room by conveyor gun position ready to spray job. Electrostatic generator released through the muzzle of the gun electrode needle into the space of the high-voltage electrostatic workpiece direction (negative), mouth spray gun powder and a mixture of compressed air and the surrounding air ionization electrode (negatively charged). After hanging a piece by transport links ground (earth electrode), so between the gun and the workpiece to form a powder reaches the surface electric field in the double electric force and air pressure driven, relying on electrostatic attraction is formed in the surface layer of uniform coating. Third, the baking curing: after spraying the workpiece is fed by conveyor 180 ~ 200 ℃ drying room heating, and the corresponding holding times (15-20 minutes) to melt, leveling, curing, we want to obtain surface effect wanted. (Different powder on the baking temperature and time are different from each). Fourth, the clean-up. After the coating is cured, remove the protective material, Shuhei glitches. Fifth, check that: the workpiece after curing, check the appearance of the main routine (whether smooth and bright, with or without particles, shrinkage and other defects) and thickness (control in 55 ~ 90μm). Of the workpiece is detected leakage spray, pinholes, bumps, bubbles and other defects, rework or re-spray.