Electronics Forum | Wed Sep 29 07:52:41 EDT 1999 | Brian
| I need a memory jog. What is the term for the growth of conductive contamination after a board is in storage or field? | Sorry, forgot one in my previous message: solder balls :-) Brian
Electronics Forum | Fri Nov 13 15:55:48 EST 1998 | Dave F
| I believe that gold fingers on my circuit boards are being | contaminated and need to clean them with some chemical | solution. Any recommendations. | Chuck: What is the type and source of your contamination? Dave F
Electronics Forum | Sun Dec 16 04:55:33 EST 2001 | Ramanandkini
Mr.Dave.F has given an exhaustive answer. I just want to mention that some attention could be paid to the plating & contaminants on the PCB. We have experienced longer soldering time due to the presence of contaminants on the plated surface.
Electronics Forum | Thu Sep 19 21:17:50 EDT 2002 | Sam
We had encountered similar problem before. But the cause was found out to be the poor good plating, instead of contamination. The way we dealt with that was sending them to the supplier for rework. It may be the fastest and most relaibility way. Goo
Electronics Forum | Thu Sep 19 21:26:52 EDT 2002 | davef
Sam, You're correct. And that's what Joe would prefer to do with his contaminated boards, but he's trying to keeping line running, I believe.
Electronics Forum | Wed May 28 11:56:18 EDT 2003 | blnorman
Yes we are using "silicones", but to find this contaminant we were looking for "silicon" the element by SEM/EDS. We use Dow materials and my contact there is checking to see if they have any info.
Electronics Forum | Mon Mar 29 11:15:58 EST 2004 | davef
Grant & JDumont: You should not have this white residue on your wave soldered connections, using VOC flux [but you know that, anyhow]. Applying too much flux is the likely cause. Other possibilities are: * flux contamination * solder contamination
Electronics Forum | Tue Mar 30 07:20:20 EST 2004 | davef
If you can rub it off, it's unlikely to be a solder mask problem. Try the "excess flux, flux contamination, solder contamination" angle.
Electronics Forum | Thu Nov 03 07:43:52 EST 2005 | davef
Questions are: * Is the problem 'wire bonds that don't stick' or 'wire bonds that fall or break off later'? * What materials are you working with? * What is your working time after plasma clean? * What does surface analysis tell you about surface con
Electronics Forum | Tue May 16 07:03:54 EDT 2006 | smtspecialist
I have only one reflow oven can I use it for both processes (leaded and lead-free)? If I do use it, one run for leaded and the next run for lead-free will that contaminate my lead-free process?
