What causes the failure of dark and uneven coating color in the pyrophosphate copper electroplating process? How to fix it?
The fault is generally caused by an abnormal PH value. As the production progresses, the PH value is gradually reduced, so the coating color will darken. At this time, we adjust the PH value to 8.5~9.0 (with ammonia), you can solve the coating fault.
Sometimes, the content of triammonium citrate is insufficient or the production is not supplemented for a long time, which will also cause the color of the coating to darken. Therefore, we need to ensure that Cu2P2O7/(NH)3C6H507 is controlled at 2.0~2.5.
If too much qing compound or organic impurities are brought into the plating solution, the coating will inevitably darken.
In summary, in the production of pyrophosphate copper electroplating process, we need to often measure and adjust the PH value to control it at 8.5~9.0. If the fault is caused by the pollution of qing compound, we can choose to add potassium permanganate 0.1 ~0.2 g/L to destroy qing compound. (Some people also choose to use hydrogen peroxide, but it needs to be diluted when adding the plating solution).
In fact, there is another possibility, that is caused by organic pollution. In this case, we can use activated carbon treatment.
Currently, some electroplating plants pyrophosphate copper production lines are running at room temperature. Appropriately increasing the plating solution temperature can help to improve the deposition rate and increase the brightness of the plated layer. Therefore, when customers use Bigely pyrophosphate copper plating process, we will recommend them to operate at a plating solution temperature of about 50℃.
Do you want to know more about the requirements of the pyrophosphate copper plating process? Please feel free to contact us.