Powder electrostatic spraying process

(1) surface pretreatmentMainly degreasing, rust removal, the method is the same as the pretreatment of liquid paint(2) scrape puttyAccording to the degree of defects of the workpiece to scratch conductive putty, after drying with sandpaper grinding smooth, you can carry out the next process(3) protection (also known as cover)If some parts of the workpiece do not require a coating, before preheating can be covered with protective glue, etcto avoid spray paint(4) warm upGenerally, there is no need to warm upIf a thick coating is required, the workpiece can be preheated to 180 to 20 degrees C, which can increase the coating thickness(5) sprayIn the high-pressure electrostatic field, the spray gun is taken to the negative pole, the workpiece ground (positive) constitutes a circuit, the powder with compressed air sprayed out of the spray gun with a negative charge, according to the principle of opposite-phase absorption spray to the workpiece(6) curingAfter spraying the workpiece, into the oven heating 180 to 200 degrees C, so that the powder cured(7) clean upAfter the coating is cured, remove the protective object and smooth the burrs(8) test Check the coating of the workpiece, where there is leakage, bumps, needle bubbles and other defects, should be re-sprayed (9) defect treatment Rework or re-spray the workpiece spouts that have defects such as leak spray, pinholes, bumps, bubbles, etc detected