PCB circuit board plate hole circle of water lines occur: single board, full board, every hole, hole, water striate, like washing the residual liquid after natural drying condition of the impurity.
PCB circuit board plate hole happened looped water lines of reason and solution: this phenomenon was called fisheye phenomenon, this is a phenomenon and electroplating luster agent and solution of chlorine content in the relationship, if the residual of grain is pure water, the more likely reason is washed before drying is not complete, the residual liquid in the drying of a hole out of dry water line phenomenon due to the plate, this kind of phenomenon is especially with the more likely to happen, or deep hole water lines should be tear-drop shaped instead of concentric circles, and a cup of hole edge there will be part of the drying of the region caused by bleaching powder water marks, such phenomenon in principle will help improve water washing.
