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The Importance of PCB and PCBA Cleaning

"Cleaning" is often overlooked during board (PCB) PCBA manufacturing and is considered to be not a critical step. However, with the long-term use of the product on the client side, the problems caused by the ineffective cleaning in the early stage caused many failures, and the rework or recall of the product caused a sharp increase in operating costs. Below, JY Electronic Technology will briefly explain the role of PCBA cleaning of circuit boards (PCB boards).

pcb cleaningPCBA (Printed Circuit Assembly) has a number of process stages in the production process, and each stage is contaminated to varying degrees. Therefore, various deposits or impurities are left on the surface of the PCB of the circuit board (circuit board), which will reduce the performance of the product. And even caused the product to fail. For example, in the process of soldering electronic components, solder paste, flux, etc. are used for auxiliary soldering, and residues are generated after soldering, and the residue contains organic acids and ions, etc., in which organic acids corrode the circuit board (circuit board) PCBA, and The presence of electrical ions can cause short circuits and cause product failure.

There are many kinds of contaminants on PCB (PCB) PCBA, which can be classified into two types: ionic and non-ionic. The ionic pollutants are exposed to moisture in the environment, and electrochemical migration occurs after energization, forming a dendritic structure, resulting in a low resistance path and destroying the PCBA function of the circuit board (circuit board). Non-ionic contaminants can penetrate the insulating layer of PC B and grow dendrites under the surface of the PCB. In addition to ionic and non-ionic contaminants, there are also particulate contaminants such as solder balls, floating spots in solder baths, dust, dust, etc. These contaminants can lead to reduced solder joint quality, sharp solder joints during soldering, and Porosity, short circuit and many other undesirable phenomena.

PCB Cleaning Function

• PCB cleaning after surface mount soldering prevents electrical defects.

Among all electrical defects, leakage is the most prominent, which is an essential factor in reducing the long-term reliability of PCB boards. This type of defect is primarily caused by ionic contaminants, organic residues, and other adhering substances that remain on the surface of the board.

• PCB cleaning after surface mount soldering eliminates corrosive substances. Erosion can damage the circuit and cause component or device brittleness. Corrosive materials can conduct electricity in a humid environment, which will further cause short circuit or even failure of the PCB. Eliminating corrosive substances virtually eliminates the negative factors that hinder the long-term reliability of the PCB.

• PCB cleaning after surface mount soldering can make the board look clear.

PCBs that have been cleaned after surface mount soldering look clear and expose defects that are easy to inspect and troubleshoot, such as thermal damage and lamination.

In summary, the cleaning of the circuit board (PCB) PCBA is very important, and "cleaning" is an important process that is directly related to the quality of the PCB (circuit board) PCBA, which is indispensable. Especially in the high-end area. These boards (assembled/mounted PCBs) must thoroughly clean the production residues and possible environments and handle dirt to ensure reliable further processing and trouble-free performance. Especially in the case of sensitive and therefore the most expensive modules, such as in the aerospace industry, the automotive industry, medical technology or telecommunications, assembled PCB cleaning is a complete and important production step.

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