Dear All,
I would like to take your opinion about the result that we have faced after cleaning the PC assemblies in a cleaning machine (Miele Dishwasher) with the cleaning detergent Qualitek Everkleen 1005. We use DI water for cleaning purpose in the machine. The water temperature was 140 Degrees F, and the concentration of the detergent was changed between 5-10% for trials.
We have seen white residues type formations, almost all over the solder joints which has formed by solder paste reflow. Strange thing is that there was no white residues formed on wave solder or hand solder joints. So those white residues should be a chemical interaction between the flux in the solder paste, detergent and DI water.
We have changed and tried the solder paste from Multicore, Alpha and Qualitek, the residue concentration has changed, lesser with Qualitek may be but still there.
I will be appreciated any comments that you can send me for helping me to get rid of those white residues and find a solution to have shiny solder joints after cleaning.
Best regards,
Necdet Ozyonum
reply »