source:Industry News release time:2021-09-13 Article author:sznbone Popular:pcb
What are the main reasons for the occurrence of copper wires on the vertical two copper wires of the circuit board
Q: What are the main and secondary reasons for the occurrence of copper wires in the vertical two copper wires of the circuit board? Where can I improve?
Answer: Circuit boards—commonly, copper wires in secondary electroplating are mostly caused by abnormal additives or copper tank contamination. As for the source of the pollution or whether there is a problem with the yao solution, you must follow up and discuss it in detail. Based on past experience, what are the main reasons for the occurrence of copper wires on the second copper wire of the secondary copper electroplating circuit board? Because the photosensitive film is immersed in the chemical solution, there will be more eluted substances. Especially from the outside, the new yao solution will quickly change color after a short period of time. This is the problem caused by the dissolution of the photosensitive film. Because these substances come from the photosensitive material, it is easy to stick to the groove wall after dissolution. It is not easy to remove. problem. If there are some polar macromolecules in these substances, it is easier to cause the phenomenon of electroplating bridging between circuits.
According to previous predecessors, no foreign matter will be found inside this type of copper wire after slicing. This means that the generation of copper wire should be guided by temporary conductive materials, causing subsequent copper growth and connecting into a line. It may be necessary to clean the residue on the tank wall with the yao liquid at the same time. Regularly re-preparing the bath liquid has become one of the important means to prevent such problems. It is a pity that so far, there is no experience value of maintenance frequency for reference.
In the past, a circuit board factory had suffered heavy losses due to this kind of problem, and after a period of improvement, it disappeared naturally, but it was not known what changes made the problem solved. Activated carbon treatment does not completely solve this problem, but there are obvious changes in the brushing of the tank wall and reconfiguration of the tank, which means that there should be foreign contaminants that interfere with the process. Many circuit board manufacturers already have FTIR polymer analysis equipment. It is recommended to compare the water pollution degree and monitor the changes in organic content. I believe that different yao water systems will still have differences, and past experience can only be used as a reference.
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