Electronics Forum | Wed May 20 15:22:13 EDT 1998 | Chris Fontaine
How about masking the metal surfaces with Kapton tape?
Electronics Forum | Fri Feb 13 13:27:22 EST 2004 | blnorman
So Deionized water has high ion concentrations, never knew that.
Electronics Forum | Wed Sep 09 09:57:15 EDT 2009 | mikesewell
You mention silver pcbs - baking will accelerate oxidation/tarnishing of the finish. Solderability will likely go down...
Electronics Forum | Thu Jul 21 10:40:37 EDT 2011 | blnorman
What is the metal finish? Silver, HASL, Tin??
Electronics Forum | Thu Jan 12 17:35:34 EST 2006 | russ
We use immersion Silver for all of our lead free PCBs. They come in the "silver saver" paper you speak of and we have found that they will tarnish after 7 days in the open enviroment. Even with this tarnish we experienced no reflow problems. We are
Electronics Forum | Wed Sep 03 11:42:21 EDT 2008 | robinj
If the tarnish is really dark, it is very difficult to remove. Since it is yellowish it is only in the early stages. Replating will definitely work. I have used sulfuric acid based cleaners to remove this yellowish color. But rinse well and dry quick
Electronics Forum | Mon Apr 26 14:40:07 EDT 2010 | blnorman
We had one product that used immersion silver plating. There were a couple of instances where we saw tarnishing, and elemental analysis confirmed the presence of sulfur. These boards did have the anti-tarnish sheets between boards, but somehow they
Electronics Forum | Thu Jul 21 08:29:05 EDT 2011 | diamondmt
I am having an recent issue occuring that after I have washed our PCBs using only high pressure DI water heated to approx 150 degrees and then being dried at 120 degrees, the once shiny metallic finish is now becoming a dull tarnished color, it does
Electronics Forum | Thu Jun 07 05:11:42 EDT 2012 | cp38260
Hi, I have pcbs (Duroid/RT 5880) with raw copper, soldered in vapour-phase chamber at 230 degrees Celsius. During soldering, copper gets tarnished. Cleaning with Vigon A250 removes the tarnished layer. Indeed, in the VigonA250 techn. datasheet it is
Electronics Forum | Mon Feb 18 07:49:17 EST 2019 | SMTA-Joe
the tarnishing is happening across all the traces without solder even being applied. The PCB is soldered into the housing first. Once this is complete the traces have changed, and when it is time to solder the components to the traces this tarnishing
