PCBA Tech - What are the techniques for cleaning circuit boards during pcba processing?

What are the techniques for cleaning circuit boards during PCBA processing?
In the PCBA processing industry, processed circuit boards are widely used in China. Pollutants will occur during the production of printed circuit boards, including residues of flux and adhesive, as well as pollutants such as dust and debris in the production process. If the PCB board cannot ensure the cleanness of the appearance, resistance and leakage will cause the PCBA circuit board to fail, which will affect the service life of the manufactured product. Therefore, cleaning the PCBA circuit board is an important step in the production process, which requires careful inspection and cleaning by the majority of PCB processing industry personnel. The following is a detailed explanation of the process and tips of cleaning the PCB.

Tips for cleaning PCBA circuit boards

The semi-aqueous cleaning is mainly composed of organic solvents and deionized water, plus a certain amount of active agent and a cleaning agent composed of additives. This cleaning is between solvent cleaning and water cleaning. These cleaning agents are organic solvents, flammable solvents, high flash point, low toxicity, and safe to use, but they must be washed with water and then dried. The use of other cleaning agents cannot guarantee the safety and cleanliness of the product.

Water purification skills are the development direction of future cleaning skills, and it is necessary to establish pure water sources and discharge water treatment workshops. Water is used as the cleaning medium, and surface active agents, auxiliary agents, corrosion inhibitors and chelating agents are added to the water to form a series of water-based cleaning agents. Able to remove water solvents and non-polar contaminants.

Used in the soldering process without clean flux or clean solder paste, after soldering directly into the next process for cleaning, no longer free cleaning skills are currently the most commonly used alternative skills, especially mobile communication products are basically one-time use Method to replace ODS. Solvent cleaning is mainly used for solvents to dissolve and remove contaminants. Solvent cleaning requires simple equipment due to its fast volatilization and strong solubility.

The above three cleaning skills can achieve a certain cleaning effect to make the surface of the product cleaner, but how to clean the PCB board quickly and effectively? The application of the ultrasonic cleaning machine can be solved. It uses ultra-high frequency to transform into kinetic energy in the liquid medium, causing a cavitation effect, forming countless small bubbles, and then hitting the surface of the object, causing the dirt on the surface to fall, thereby achieving the effect of cleaning. Because it passes through liquid, it can be cleaned in place as long as the liquid can touch the outer surface, leaving no dead corners.

It can work on every appearance of multiple objects at the same time. It is very useful and fast, able to clean in about 15 minutes. One of the advantages of using ultrasonic cleaning is that it can be usefully restored, improve the capabilities of pads and components, and reduce electromagnetic interference. The above is a sharing based on the information on the Internet and my own practical experience. I hope everyone can help after reading it.