"Cleaning"is often overlooked in the PCBA manufacturing process of circuit boards(circuit boards), and cleaning is not a critical step. However, with thelong-term use of the product on the client, the problems caused by the previousinvalid cleaning caused many failures, and the return of repairs or recalledproducts caused a dramatic increase in operating costs.
Circuit board(circuit board) PCBA cleaning function.
The PCBA (printedcircuit assembly) production process passes through multiple process stages,and each stage is contaminated to varying degrees. Therefore, various depositsor impurities remain on the surface of the circuit board (circuit board) PCBA.These contaminants will reduce product performance , Or even cause productfailure. For example, in the process of soldering electronic components, solderpaste, flux, etc. are used for auxiliary welding, and a residue is generatedafter welding. The residue contains organic acids and ions. Among them, organicacids will corrode the PCBA of the circuit board (circuit board), and Thepresence of electrical ions may cause a short circuit and cause productfailure.
There are manykinds of contaminants on the PCBA of the circuit board (circuit board), whichcan be categorized into ionic and non-ionic types. When ionic pollutants comeinto contact with moisture in the environment, electrochemical migration occursafter energization, forming a dendritic structure, resulting in a lowresistance path and destroying the PCBA function of the circuit board (circuitboard). Non-ionic pollutants can penetrate the insulating layer of the PCB andgrow dendrites under the surface layer of the PCB. In addition to ionic andnon-ionic contaminants, there are granular contaminants, such as solder balls,floating points in the solder bath, dust, dust, etc. These contaminants willcause the quality of the solder joints to deteriorate, the solder joints willbe sharpened and generated Poor phenomena such as blowholes and short circuits.
In summary, thecleaning of the PCBA of the circuit board (circuit board) is very important."Cleaning" is an important process directly related to the quality ofthe PCBA of the circuit board (circuit board) and is indispensable.