1. Strengthen the washing before dyeing
The workpiece must be fully rinsed after being taken out of the anodizing tank, especially the slits and blind holes of the workpiece, otherwise the residual acid and alkali will flow out slowly during the dyeing process, causing the pH value of the dyeing solution to deviate from the normal range, and The color of the surface of the residual acid-base part is obviously different from that of the clean part, and even corrodes the oxide film to show white.
2. The anode is dyed after hard oxidation
The workpiece should be dyed immediately after anodizing. If the workpiece is exposed to the air for too long after anodization, the pores of the film will shrink and may be stained with dirt, which will cause difficulty in dyeing. If the dyeing tank is too small, when dyeing in batches is required, the parts to be dyed should be soaked in clean water.
3. Workpieces cannot overlap during dyeing
During dyeing, the workpieces must not overlap, especially the flat parts, otherwise the overlapped parts will be covered and form a yin and yang surface.
4. Strengthen the washing after dyeing
If the surface of the workpiece is not rinsed, residual pigments will contaminate the assembly.