Pretreatment finished in a nonuniform manner accordingly causes an uneven thickness of the deposited film.
Q1:
Uneven drying in pretreatment process
A1:
- Install a spray device to prevent drying-up.
Q2:
Uneven degreasing and other defects in pretreatment
A2:
- Check whether there was any oil type or oil consumption change.
- Keep the bath under proper control.
With respect to paint, it is possible to mitigate the effect of nonuniform treatment by increasing the film’s electrical resistance (with a higher ash content and lower solvent).