Electronics Forum | Thu Jul 31 15:41:23 EDT 2003 | davef
Q: Could any of you guys tell me what exactly is this greenish thing ? A: No, but is not copper oxide. Copper oxide is brown, the color of a penny [here in the US] or an untreated copper laminated trace on a board. Many copper salts are greenish in
Electronics Forum | Thu Jul 31 11:33:51 EDT 2003 | yngwie
I faced problem over connecter's pin that were hot air soldered. This connector has 168 pins ( similar to the straddle connector ). The process is to apply the flux onto the connector's J-leads, and the hot air pencil were then ran thru' the leads to
Electronics Forum | Fri Aug 01 23:43:52 EDT 2003 | Yngwie
Thanks Dave, the residue appeared to be similar to fungus. First, I thought it could come from water soluble flux but, our plant only runs no-clean. So, can I concluded that this greenish "fungus" looking staff is not initiated from high hot air temp
Electronics Forum | Sat Aug 02 08:12:05 EDT 2003 | davef
Q: So, can I concluded that this greenish "fungus" looking staff is not initiated from high hot air temperature setting ? A: Your temperature setting could have increased the growth rate of this crunchy looking stuff, but we wouldn't start there to
Electronics Forum | Thu Jan 22 08:48:42 EST 2004 | patrickbruneel
Kris, You will need to change your probes to "bite" into the surface twisting probes specialy designed for copper surfaces. The surface hardness of copper is a lot higher compared to tin. link to article from osp manufacturer (see page 5) http://www
Electronics Forum | Wed Jan 21 16:55:22 EST 2004 | patrickbruneel
Hi, Are you testing bare boards or soldered boards. Are the test probes in contact with soldered pads or contacting the copper with the osp coating (not soldered). If you could clarify this it would be easier to give some hints for probable causes.
Electronics Forum | Wed Jan 21 17:43:04 EST 2004 | Kris
Hi, I had the same question. In our case we are contacting the copper with the osp coating (not soldered). any published reports that we can reference Thanks
Electronics Forum | Thu Jan 22 09:21:45 EST 2004 | davef
Oh, another thing, we do not like to probe copper. It's hard, compared to solder, and beats-up the probes too much. [As Patrick Bruneel states in this thread.] Consider reflowing paste on your test pads.
Electronics Forum | Thu Apr 15 11:15:30 EDT 2004 | patrickbruneel
Pure (red) copper oxide is green, its not a residue its just oxidation. In your case water and heat will accelerate the oxidation process of unplated or unprotected pure copper. The best way to avoid this from happening is use a socket with tin or n
Electronics Forum | Mon Aug 30 16:10:10 EDT 1999 | Dave F
| I have looked through the IPC web page and surfed to frustration. Can somebody give me a lead? | Brian: We don't use an etched board. We use a special stencil, described below and print on bare copper laminate. 3 Solder Wetting Test. Recogniz
