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Why does water streaks occur in electroplating of circuit boards?
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<> Circular water streaks occur on the edges of the holes of single-sided circuit boards.
Single-sided full boards, each hole edge has There are water streaks, like the residual liquid from washing that has dried naturally. Possible causes and solutions: Some people call this phenomenon fish-eye phenomenon. This phenomenon is related to the gloss agent of electroplating and the chlorine content in the liquid. If it is purely the residue of water marks, the most likely cause is that The water washing before drying is not complete enough, causing the residual liquid in the holes to flow out and dry on the board surface during drying, resulting in water streaks. This phenomenon is especially likely to occur in small or deep holes. The water streaks should be in the shape of teardrops. Instead of concentric circles, and the area around the cup hole will also have some traces of scattered water droplets caused by drying. In principle, improving water washing will help with this phenomenon.

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