For those who work with printed circuit boards (PCBs) used in electronic equipment, the issue of whether or not you should clean them comes up at some point. Cleaning requires time and money. If done improperly, it can sometimes do more harm than gain. Cleaning PCBs is crucial for many reasons, and this article will demonstrate how to do it right.
What Is the Purpose of Cleaning a Printed Circuit Board (Pcb)?
The manufacturing techniques employed on electronic assemblies typically involve several chemical processing processes. At each step in the procedure, there is the possibility that hazardous compounds are left on the PCA that could cause the safety of the assembly to be in danger. It is frequently required to clean the area to remove potentially harmful residues and improve reliability. Cleaning can also remove the residues that are useful during an inspection. You may check out August Electronics – Home page for their offered products.
Improve the PCBs Aesthetic Appeal
For PCB contractors, their boards’ appearance could reflect the quality of their work. Your customer’s inbound QC inspectors could raise red flags when they detect oily substances around solder joints. The solder joint “blow hole” may appear if the flux residue burns and causes spots to appear on the solder joints. This is an indicator of faults within the rework area, alerting others to the issue even though it isn’t a problem in the first place.
PCB Reliability Improvements
Its nature as a final product is what determines its durability. If a keyboard for a computer is damaged, no one will suffer because it’s an unrecyclable item. An EMS supplier could use no-clean flux to avoid the whole process of cleaning. On the other hand, pacemaker electronics must meet highly stringent standards because the malfunctioning of the board can result in death. Assembly and subsequent rework necessitate cleaning, and the procedure must be rigorously evaluated for its efficacy and repeatability. While cleaning is necessary for long-lasting and durable equipment, it is possible that the results could fall between the two, despite strict testing and requirements.
Protect Pcbs and Components from Corrosion
There are acids in the leftover flux on the electrical circuit boards. The residues could attract air moisture and cause corrosion of component leads and PCB connections if a cleaning process doesn’t take them out.
The Conformal Coating Prevents Adhesion Issues
Many people know that painting requires an uncluttered surface. Paint peels if not. Conformal coating is contaminated even by no-clean flux. “No-clean” refers to ionic compounds left behind after soldering, but not the possibility that the layer could stick.
The coating may lift or delaminate if flux remnants are left on a PCBA before coating. This is evident when pockets are isolated between solder joints (except at the base of a PCB that has been soldered with a wave). The layers are typically semi-permeable and “breathe” some. Moisture in flux residue can cause corrosion.
Avoid Ionic Contamination and Dendritic Growth
Dendrites form when polar or ionic particles from flux residues and other source materials are exposed to humidity in the air, and a current is induced. Because they are conductive and conductive, dendrites may create an unintentional track that may leak current or even short circuit over time. For your product needs you may visit their website at https://aeicm.com/pcb-assembly/ for more information.