Classification of PCBA contaminants
There are many types of contaminants on PCBA boards, which are mainly formed by the combination of physical bonds and chemical bonds.Physical bond binding: The contaminants form physical tension with the surface of the PCBA, and are combined by the surface tension between the molecules. Since physical bonding is a physical effect, its physical bond energy is relatively low, generally between 0.8 × 103 to 2.1 × 104 J/mol. Turnkey PCBA companies use flux during assembly. If it is cleaned even if it is cleaned, the rosin, resin and residual glue attached to the PCBA will form a physical bond.
"Chemical bond" combination: refers to the chemical reaction between the pollutant and the surface of t
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