Seektronics

  Stripping   In the production of PCB boards, there are only two steps in which stripping is used. The D/F stripping process is simple, using horizontal equipment, and the chemical solution used is mostly 1~3% NaOH or KOH by weight.   Line etching   1. The mechanism of copper etching   (1) copper ions in the alkaline environment solution is easy to form copper hydroxide precipitation, in order to prevent this precipitation phenomenon, you need to add enough ammonia to make the wrong ion group to produce ammonia copper to inhibit the precipitation occurs. It also allows the copper's original amount and its continued dissolution in the liquid to form a very stable wrong ammonia copper ion. Such divalent copper ammonia ion can be used as an oxidizing agent to dissolve the zero-valent copper metal by oxidation. Still, during the redox reaction, monovalent copper ions will be produced.   In this reaction, the solubility of sub-copper ions is very poor, it needs to be assisted by ammoni