Electronics Forum | Tue May 27 11:59:14 EDT 2003 | blnorman
Is anyone aware of any reports, studies, articles on the subject of silicon contamination in SnPb solder joints. We are evaluating repair of conformally coated (silicone) boards. The fear is that we will never totally remove the silicone and once i
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 | Thu Sep 21 17:50:43 EDT 2000 | Bill Boles
Does anyone have a quick reminder for a PCB with immersion gold surface finnish going through a reflow profile: Which of the following statements is more correct? A: In order to minimize gold in the intermetallics of the solder joint, the board temp
Electronics Forum | Wed May 28 14:35:47 EDT 2003 | davef
Wow, you're very correct. I guess we use silicone to calibrate our machine, as follows: XPS spectral measurements of dimethyl silicone should include O(2s) at 25 eV, Si(2p) at 102 eV, Si(2s) at 153 eV, C(1s) at 285 eV, and O(1s) at 533 eV. The C(1s
Electronics Forum | Tue May 27 12:40:50 EDT 2003 | davef
Hi Bill You said, "silicon". We assume by your discussion that you ment to say, "silicone". For background on silicone and soldering, check with Dow Corning [517-496-6000]. They make a OS2 [VOC-free] silicone stripper and should be able to give y
Electronics Forum | Tue Sep 26 20:04:31 EDT 2000 | Dave F
Wolfgang: I think that we were answering different questions. * I thought Bill wanted to talk about minimizing the amount of gold in the solder connection that is available to make intermetallics * You were talking about the formation of intermeta
Electronics Forum | Thu Sep 21 21:00:21 EDT 2000 | Dave F
Well, I'm going to assume you: * Have a nichel barrier between the copper on your board and the gold / solder solution * Use a lead / tin near euthectic solder If so, I pick "C" - It doesn't matter. When concerned about copper tin intermetallics, t
Electronics Forum | Fri Sep 22 05:33:59 EDT 2000 | Wolfgang Busko
That "C - it doesn�t matter" choice sounds good because it doesn�t give you a headache when profiling but it gives me a headache when I read the article in the current "newsletter" about profiling where I found this: "If soldering to gold over nick
Electronics Forum | Mon Jan 15 08:54:40 EST 2024 | SMTA-64304553
Trying to understand the impact of iron contamination above IPC recommendations (0.02%) on selective solder joints. Brittleness and discolouration are known but are there other factors that should be accounted for?
Electronics Forum | Sun Oct 09 21:44:12 EDT 2005 | Eskay
If the solder in the pot is to be replaced, the cost is very high. Is there any methods that could control the lead content to be low 1000ppm? Any methods what if the content is exceeded 1000ppm?
