Analyze the cause and treatment of foaming and insufficient gloss of electrophoretic paint film
During the coating process of the electrophoretic paint, a variety of paint film problems will appear, such as blistering, insufficient gloss, lack of brightness, and wrinkling of the electrophoretic paint film, which is the so-called orange peel phenomenon. So today the electrophoretic paint manufacturer Hong Heshun Company will study the causes and treatment methods of these problems.
First, the electrophoretic paint film is blistering
Bubble phenomenon: There is a bubble-like appearance on the surface of the paint film.
Causes: When the workpiece is immersed in the electrophoresis bath, it is caused by bubbles or air on the surface of the paint solution; air is involved in the circulation system of the bath solution; the anode shielding is poor, and there are tiny bubbles in the paint solution; Poor heat flow.
Solution: 1. Pay attention to the tilt angle when the product enters the electrophoresis tank, and pay attention to the direction and tilt of the hanging workpiece; 2. Regularly check the shielding of the circulation system and anode to prevent air bubbles from staying in the tank.
Second, the paint film is low gloss
Phenomenon: The gloss of the electrophoretic coating is not high enough and there is no brightness.
Causes: 1. The thickness of the electrophoretic paint film is not enough; 2. The coating film has re-dissolved; 3. Poor washing after electrophoresis coating; 4. The pH value of the electrophoresis bath or pure water is too high; 5. The paint in the electrophoresis tank is contaminated; 6. It is not baked and dried; 7. The alkali corrosion is excessive.
Solution: 1. Check whether the voltage of the electrophoretic coating is within the process control range; 2. Do not place the coated product after the electrophoretic coating in the electrophoresis tank liquid or the water washing tank for a long time; The quality of pure water in the water washing tank; 4. Check whether the water washing time after electrophoresis is appropriate; 5. Check whether there is any abnormality in the solid content of the recovery tank; 6. Perform ion exchange treatment according to the measurement result of conductivity; Is the baking time and temperature appropriate?
Third, the paint film is wrinkled
Phenomenon: The paint film has wrinkles, which is the phenomenon of orange peel
Causes: 1. The electrophoresis bath has severely aged; 2. The pH value is too high; 3. The bath is contaminated; 4. The solid content of the bath is too low.
Solution: 1. Ultrafiltration activation of the electrophoresis bath; 2. Sampling and testing to adjust the pH of the bath; 3. Adjust the solid content to about 8%.
Today about the problem of electrophoretic paint film is shared here. In the next article, Hongheshun electrophoretic paint manufacturers will continue to answer questions about electrophoretic coating. Welcome everyone to pay attention to or collect our official website, or call Us: 0755-89264486. We will have professional technicians to solve your problems.