PCB Technical - How to clean the circuit board

How to clean the circuit board
"Cleaning" is often overlooked in the PCBA manufacturing process of circuit boards(circuit boards). Cleaning is not a critical step. However, as customers use the product for a long time, problems caused by previous ineffective cleaning have led to many failures. Products returned for repair or recall have led to a sharp increase in operating costs.

Circuit board (circuit board) PCBA cleaning function.

The PCBA (Printed Circuit Assembly) production process goes through multiple process stages, and each stage has different degrees of pollution. Therefore, various deposits or impurities remain on the surface of the circuit board (circuit board) PCBA. These contaminants can reduce product performance and even lead to product failure. For example, in the process of soldering electronic components, solder paste, flux, etc. are used for auxiliary soldering, and residues will be generated after soldering. The residue contains organic acids and organic ions. Among them, the organic acid will corrode the PCBA of the circuit board (circuit board), and the presence of electric ions may cause a short circuit and cause the product to fail.

There are many pollutants on the PCBA of the circuit board (circuit board), which can be divided into ionic and non-ionic. When ionic pollutants come into contact with moisture in the environment, electrochemical migration occurs after power-on, forming a dendritic structure, forming a low-resistance path, and destroying the PCBA function of the circuit board (circuit board). Non-ionic contaminants can penetrate the insulating layer of the PCB and grow dendrites under the surface layer of the PCB. In addition to ionic and non-ionic pollutants, there are also particulate pollutants, such as tin balls, floating points in the tin bath, dust, and dust. These contaminants will cause deterioration of the quality of the solder joints, the solder joints will be sharpened and produce pores and short circuits and other undesirable phenomena.
In summary, the cleaning of the circuit board PCBA is very important. "Cleaning" is an important process, which is directly related to the PCBA quality of the circuit board (circuit board) and is indispensable.
At present, the country has higher and higher requirements for environmental protection and greater efforts in link governance. This is a challenge but also an opportunity for PCB factories. If PCB factories are determined to solve the problem of environmental pollution, then FPC flexible circuit board products can be at the forefront of the market, and PCB factories can get opportunities for further development.
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