1. Strengthen the washing before dyeing.
Artifacts by should be completely flushed after anodic oxidation groove, especially the slit of artifacts, the place such as blind hole, otherwise the remnants of acid and alkali in dyeing process will be slow, the dyeing solution pH value deviates from the normal range, and make the color on the surface of the residual alkali parts and clean parts have obvious difference, even corrosion oxide film and shows white.
The anode is stained by hard oxidation.
The workpiece should be dyed immediately after anodic oxidation.If the anodic oxidation of the workpiece is exposed in the air for a long time, the pores of the film will be reduced, and it may be stained with dirt, resulting in dystaining.If the dyeing tank is too small, the stain should be soaked in clean water.
The workpiece shall not be overlapped when dyeing.
When dyeing, the workpiece should not be overlapped, especially in the plane part, otherwise it will form the Yin and Yang area due to the overlapping part.
4. Strengthen the rinse after dyeing.
If the surface of the workpiece is not flushed, the residual pigment will contaminate the composition.
