In the alkaline zinc plating process, common faults include coating floweriness, coating blistering, coating roughness and dullness, etc. The causes of these faults vary, and the solutions are also different.
Author: Marisa
In the alkaline zinc plating process, common faults include coating floweriness, coating blistering, coating roughness and dullness, etc. The causes of these faults vary, and the solutions are also different.
Here are some specific faults and their causes and solutions:
1. Plating is blooming
Reason: the cleaning water is not clean, the pickling and rust removal effect is not good, the installation is unreasonable, the current density is insufficient or the brightener is insufficient.
Solution: ensure that the cleaning water is clean and has good fluidity, check the pickling and rust removal effect, install the workpiece reasonably, and adjust the current density and brightener concentration.
2. Plating is bubbling
Reason: the oxide scale is not completely removed, the substrate material is poor, the additives in the plating solution are excessive, and the impurities in the plating solution are excessive.
Solution: thoroughly remove the oxide scale, check the substrate material, and adjust the additives and impurities in the plating solution.
3. The plating is rough and not bright
Reason: the plating solution temperature is too high, the cathode current density is too large, the zinc content in the plating solution is too high or the additive content is low, and there are solid particles in the plating solution.
Solution: control the plating solution temperature, adjust the cathode current density, analyze and adjust the plating solution composition, and filter to remove solid particles.
4. Copper pollution
Reason: brought in when hooking and washing the conductive copper bar.
Solution: Use sodium sulfide or zinc powder for low current electrolysis.
5. Lead pollution
Cause: Leading in from zinc anode.
Solution: Use 0# or 1# zinc anode and adjust the anode area ratio.
6. Iron pollution
Cause: Leading in from inferior sodium hydroxide or workpiece.
Solution: Use white flake caustic soda to thoroughly clean the workpiece.
The above methods can effectively solve common fault problems in the electroplating process and ensure the quality and stability of the coating.