PCB gold plating layer processing of the main reasons black

Aug. 21, 2011 - PRLog -- EMAIL counterparts recently been received and QQ contact, talking about the problems black plated gold layer causes and solutions. As a result of the actual factory production line, using the equipment, medicine system is not exactly the same. Needed for specific products and the actual situation analysis and processing solution. Here are just talked about the three general causes of common problems for reference.

1, electroplating nickel layer thickness control.
We must assume that the Lao Gao dizziness, and said gold plating layer of black issues, how would say the thickness of plating on the nickel layer. In fact PCB layers are generally thin gold plating, gold plating on the surface is reflected in a lot of problems due to poor performance of nickel plating caused. General plating nickel and thin appearance of the product will cause white and black phenomenon. So this is the preferred plant engineers to check the item. Usually takes about nickel plating to 5UM thickness would be sufficient.

2, the situation Nickel cylinder syrup
Nickel-cylinder or say something. If the solution of nickel cylinder not a good long-term maintenance, not timely processing of carbon, then out of the nickel plating will be prone to flaky crystal, the hardness increase increased brittleness. Black coating will have a serious problem. It is easy to overlook many control points. Are often an important reason for problems. So you carefully check the status of the factory production line medicine, comparative analysis and a thorough and timely processing of carbon, thus restoring the activity of medicine and clean plating solution. (If you do not deal with it more carbon thing..)
RayMing Technology (Overseas Department)
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3, Jin-cylinder control
Now comes the control of gold cylinder. Generally good if the medicine as long as the filter and added, gold tank pollution, and the stability of the cylinder will be better than that of nickel. But the need to pay attention to check whether the following aspects of good: (1) gold cylinder is sufficient to add supplements and over? (2) PH value control medicine, how? (3) conductive salt situation? If the test results there is no problem, then machine analysis of AA content of impurities in solution. Margin cylinder syrup state. Finally do not forget to check the gold cylinder filter cotton core is not a long time not to replace the ah. If so, can you control that is not strictly the ah. Do not hurry to replace

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