What is the reason for the uneven brightness and negative and positive sides of the alkali zinc coating?

1. The workpiece is too densely loaded It is necessary to appropriately reduce or redesign the hangers.
2. High zinc content in the bath Add sodium hydroxide after titration analysis Or dilute the plating solution.
3. The current density is too small, The current density needs to be increased appropriately.
4. The content of brightener in the plating solution is insufficient, Brighteners need to be properly added.