Seeds refer to the adhesion of foreign matter on a paint film.
Seeds originate from iron particles, a furnace, dust, pigments, and flocculation among others
Q1:
Seeds due to rust formation prior to the coating process or during handling after chemical conversion. (Use care especially during the rainy season and other humid seasons.)
A1:
- Before processing, keep workpieces under careful control.
- Shorten the time interval between chemical conversion and rinsing. (If the line stops because of a problem or other reason, rinse the workpieces immediately using a hose or the like.)
- Avoid extended exposure of the workpieces after the pretreatment process.
Q2:
Seeds due to iron particles on a horizontal surface after chemical conversion.
A2:
- Enhance rinsing before electrodeposition to wash iron particles away.
- Reduce iron particles carried into the chemical conversion bath
Q3：
Seeds originating from iron particles, dust, and paint adhering to the substrate in the electrodeposition bath
during electrodeposition.
A3:
- Optimize the flow in the electrodeposition bath, remove the causes of seeds, and implement preventive measures to control the rising of the cause.
- Enhance stirring at stagnant corners to prevent settling.
- Reduce dust carried in.
Q4:
Adhesion of flocculation seeds to the substrate in the rinse system.
A4:
- Refrain from overspraying to prevent flocculation.
Q5:
Adhesion of flocculation seeds to the substrate in the dip-and-rinse bath outside the UF recycle system.
A5:
- Control the pH of the rinsing bath to a somewhat low level to prevent flocculation. (Remember to be careful about redissolution of the paint film.)
Q6:
Adhesion of matter falling from the conveyor system.
A6:
- Wash the matter away with the final rinsing spray.
- Conduct cleaning regularly so that nothing falls from the conveyor system.
Q7:
Adhesion of oven dirt .
A7:
- Clean the oven regularly to remove the glop.
Q8：
Flocculation of electrodeposition paint due to alkaline/pretreatment solution.
A8：
- Reduce residual pretreatment solution.