What are the Abnormal Conditions During PCB Circuit Board Processing?

As a Finishing PCB Technologies Supplier, share with you. In the process of PCB circuit board processing, it is inevitable that several defective products will be encountered, which may be caused by machine errors or human causes. For example, sometimes an abnormal situation called a broken state occurs. The cause is Specific analysis of specific circumstances.

If the rupture state is a point-like distribution rather than a whole circle of open circuit, it is called a point-shaped hole rupture, and some people call it "wedge-shaped hole rupture". The common cause is the poor handling of the slag removal process. When PCB circuit boards are processed, the scum removal process will first be treated with a leavening agent, and then the strong oxidant "permanganate" will be corroded. This process will remove the scum and produce a microporous structure. The oxidant remaining after the removal process is removed by the reducing agent, and the typical formula is treated with acid liquid.

After the glue residue is processed, the problem of glue residue will no longer be seen. People often neglect the monitoring of the reducing acid solution, which may allow the oxidant to remain on the pore wall. After the circuit board enters the chemical copper process, the circuit board will undergo micro-etching treatment after the pore forming agent is treated. At this time, the residual oxidant is again soaked in acid to peel off the resin in the residual oxidant area, which is equivalent to destroying the pore forming agent.

The damaged pore walls will not react in the subsequent palladium colloid and chemical copper treatment, and these areas will show no copper precipitation. If the foundation is not established, the electroplated copper will of course not be able to cover it completely and cause dot-shaped holes. This kind of problem has occurred in many circuit board factories when they are processing circuit boards. Paying more attention to the monitoring of the potion in the reduction step of the de-smear process should be able to improve.

Every link in the PCB circuit board processing process requires us to strictly control, because sometimes chemical reactions will slowly occur in corners that we do not pay attention to, thereby destroying the entire circuit. Everyone should be vigilant about this kind of broken hole.

Usually the color of the PCB board is green or brown, which is the color of the solder mask. It is an insulating protective layer that can protect copper wires, prevent short circuits caused by wave soldering, and save the amount of solder. A screen printing surface will also be printed on the solder mask. Usually words and symbols are printed on this to mark the position of each part on the board. The screen printing surface is also called the icon surface.

When the final product is made, integrated circuits, transistors, diodes, passive components, and various other electronic components are mounted on it. Through the wire connection, the electronic signal connection and the application function can be formed.

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