| project | cause | Solution |
| bubble | ① Moisture is not effectively dried after the surface treatment of the workpiece ② It is not effective to clear the oil stain and rust during the surface treatment of the workpiece ③ Bottom volatiles are not cleaned | ①Effective drying of moisture after surface treatment of the workpiece ②Strictly control the treatment quality of the workpiece surface ③The putty coating should be dry and effective |
| Shrinkage cavity | ① The oil stain and rust on the surface of the workpiece have not been cleaned ②The difference in the flatness of the workpiece surface is too large ③The paint is mixed with different kinds of powder or magazines | ① Strictly control the quality of degreasing and derusting ②Scrape the uneven part of the workpiece surface with putty ③ After spraying, strengthen the cleaning work |
| Poor coating impact strength and adhesion | ① The temperature is too low or the time is short when the coating is dried ② Moisture or oil on the surface of the workpiece | ① Improve the drying quality of the coating ②Improve the treatment quality of workpiece surface |
| Coating hardness difference | ①The coating is too thick ②The distance between the workpiece and the gun is too close ③The output voltage is too high | ① Adjust the spraying distance to prevent the coating from being too thick ② Control the distance between the gun and the workpiece ③ Properly adjust the output voltage |
| crust | ① powder agglomeration ② Uneven coating thickness ③Poor atomization of powder ④Baking temperature is too low | ①Keep the powder dry and prevent from moisture ② Improve the uniformity of coating thickness ③ Adjust the output voltage and air pressure ④Strictly control the drying temperature and time |
| Coating Discoloration | ① Baking temperature is too high ②Too long when baking ③ The temperature of the drying room is partially overheated ④ Poor thermal convection facilities in the drying room | ①Baking according to the temperature specified by the technology ②Baking according to the time specified by the technology ③ Check the heating element of the drying room ④ Improve the heat convection design of the drying room |
