source:Industry News release time:2022-10-10 Article author:yu Popular:pcb
The acid copper electroplating tank itself may have the following aspects: the air blowing pipe deviates from the original position, and the air is not evenly stirred; the filter pump leaks or the liquid inlet is close to the air blowing pipe to inhale air, resulting in fine air bubbles, which are adsorbed on the board surface or the edge of the line. Especially at the horizontal edge and corner of the line; there may be another point that the use of inferior cotton core, the treatment is not thorough, the anti-static treatment agent used in the cotton core manufacturing process contaminates the bath liquid, resulting in leakage plating, this situation can be increased Blow air and clean the foam on the liquid surface in time. After the cotton core is soaked in acid and alkali, the color of the PCB board surface is white or uneven: mainly due to the problem of polishing agent or maintenance, and sometimes it may also be the problem of cleaning after acid degreasing. , the micro-erosion problem. The copper cylinder polishing agent is out of balance, the organic pollution is serious, and the bath temperature is too high. Acid degreasing generally does not cause cleaning problems, but if the pH value of the water is too acidic and there are many organic substances, especially recycling and circulating water washing, it may cause poor cleaning and uneven micro-etching; micro-etching mainly considers the excessive content of micro-etching agents low, the copper content in the micro-etching solution is too high, and the temperature of the bath solution is low, etc., which will also cause uneven micro-etching of the board surface; in addition, the cleaning water quality is poor, the washing time is slightly longer, or the pre-soak acid solution is polluted, and the board surface may be treated after treatment. There will be slight oxidation. When the copper tank is electroplated, because it is acid oxidation and the board is charged into the tank, the oxide is difficult to remove, and the color of the board surface will also be uneven; in addition, the PCB board surface is in contact with the anode bag, and the anode is not conductive. Such defects can also be caused by conditions such as anode passivation.
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