Regarding the cause and solution of the blackening of the electroplated gold layer of the PCB copy board, let the editor introduce to you today! The problem of blackening of the gold layer when the PCB is copied is very common, but due to the production lines of actual factories, The equipment used and the potion system are different, we will analyze it from the following three aspects:
PCB copy board
1. Thickness control of nickel plating layer
Everyone has to say that blackening of the gold plating is a problem. How do we talk about the thickness of the electroplated nickel layer. In fact, the gold-plated layer of the PCB is usually very thin, which is reflected in the gold-plated surface. Many problems are caused by poor nickel plating. Often, thin nickel plating results in a white and black appearance of the product. Therefore, this is the first item checked by factory engineers and technicians, usually, the thickness of the nickel layer needs to be electroplated to about 5um.
2. The situation of the nickel plating cylinder chemical solution
Still talking about nickel cylinders. If the nickel cylinder chemical solution is not well maintained for a long time and the carbon treatment is not timely, the nickel plating layer is prone to flaky crystals, which will increase the hardness and brittleness of the plating layer. Serious blackened coating problems can occur. This is an important point of control that many people tend to overlook. This is usually a significant cause of the problem. Therefore, please carefully check the status of the chemical solution in your production line, conduct comparative analysis, and conduct thorough carbon treatment in time to restore the activity of the chemical solution and clean the electroplating solution.
3. Golden bottle control
Now we are talking about Jinzhu control. Generally speaking, as long as the liquid medicine is well filtered and replenished, the pollution degree and stability of the gold bottle will be better than that of the nickel bottle. However, the following aspects need to be checked for goodness:
(1) Are Pot of Gold Supplements Adequate and Excessive?
(2) How to control the pH value of the potion?
(3) What about conductive salt?
If there is no problem with the inspection results, use the AA machine to analyze the impurity content in the solution. The state of the liquid medicine in the safe storage tank. Finally, don't forget to check whether the gold filter cotton core has not been replaced for a long time.
The above are the reasons and solutions for the blackening of the electroplated gold layer of the PCB copy board. I hope it can provide you with some references!
