Why do we have to "take a bath" after PCBA processing is completed, is actually what we all often say, PCBA circuit board cleaning. PCBA means printed circuit board assembly. The circuit board is an electronic product at any rate, with a lot of SMD components integrated on it, so why should it be cleaned?

Will it adversely affect electronic components? Today, the editor of Jingbang Electronics will share with you that this worry is unnecessary. The cleaning we are talking about is not to wipe with detergent with water, but to use ultrasonic to clean. So what is the purpose of clarity? Today we come with everyone

Discuss:

In the process of PCBA processing, especially SMT patch and plug-in post soldering, it has to go through a lot of processes, including SMT single and double-sided solder paste printing and soldering, and wave soldering furnace. Each of these stages requires a lot of processes and equipment, and at the same time it will be subject to varying degrees of pollution, which is unavoidable. Therefore, these deposits or impurities will accumulate on the surface of the PCB circuit board when the PCB circuit board is manufactured. Seriously, it will reduce product performance or even product failure. For example, the solder paste and flux in the placement process may contain organic acids and ions after soldering. Among them, organic acid will corrode the circuit board (circuit board) PCBA, and the presence of electric ions may cause a short circuit, causing product failure or scrapping of the entire batch of products.

In addition to the surface contaminants visible to the naked eye, there are many types of contaminants on PCBA. Ionic and non-ionic are two major categories. Ionic pollutants are mainly due to exposure to humidity in the environment. Electrochemical migration occurs during the circuit board energization test or subsequent use, thereby forming a dendritic structure, resulting in a low resistance path. In the previous article, we also explained the hazards after the formation of the dendritic structure. If you want In-depth understanding can be directly searched.