Aqueous Cleaning PCB's with Potentiometers| 28 April, 2008
do you have any issue aqueous cleaning pcb's with potentiometers? We have issues such as water penetrating inside the potentiometers causing shorts or electrical problem in the field. what is the drying temp and time you have in your experience in washing them?
Aqueous Cleaning PCB's with Potentiometers| 29 April, 2008
THANKS FOR YOUR REPLY GUYS...
solder paste is Water Soluble. We mask the potentiometers prior to aqeous washing using solder mask, then our operator brush the solder joints with IPA after the Wash Process...I'm concerned about the long term reliability of the solder joint not properly washed by DI Water.
Is brushing with IPA acceptable to remove WS Flux on the termination? what issue will it pose in the future aside from corrosion?
Aqueous Cleaning PCB's with Potentiometers| 30 April, 2008
It's not acceptable to us. More importantly, you need to determine if it's acceptable to your customer.
Recognize that your little IPA scrub does NOT remove the OA flux residues from the board. It mearly spreads them out across the board and under components. We have ranted on about this practice here on SMTnet previously. So to spare others from more of the same, search the fine SMTnet Archives for more, if you're interested.