Electronics Forum | Thu Jul 21 09:49:28 EDT 2011 | kahrpr
what exactly is tarnishing parts, pads, solder joint?
Electronics Forum | Wed Aug 27 18:28:29 EDT 2008 | blnorman
We have an immersion silver board that has a brown discoloration after processing. It's not flux residue, that normally doesn't cause this condition. Elemental analysis shows less than 1% sulfur, and I thought silver sulfide is more a black color.
Electronics Forum | Fri Aug 08 06:44:33 EDT 2003 | Matt Kehoe
Emergency!!! We have a small run (5) of very dense boards that have an immersion tin finish. They were built in April/May and have a heavy tarnish appearance on them, smd pads and through holes. We are being asked to apply ssd to the surface mount pa
Electronics Forum | Wed May 20 15:10:35 EDT 1998 | Dave F
We notice that DI water seems to tarnish or discolor the metal packaging on crystals and DIN connectors. Our marketing types like the shiney metal surfaces. We don't want to hand solder these parts after washing. Any suggestions? Dave F
Electronics Forum | Fri Aug 30 11:53:12 EDT 2002 | genny
Possibly this is tarnish? Silver finish requires a bit more care in handling or packaging - to avoid contact with sulphur which may cause tarnish. Some cardboard boxes gas out enough sulphur to cause a problem. Possibly look at your method of stora
Electronics Forum | Wed Dec 17 16:12:01 EST 2003 | Ashok Dhawan
Anyone who has experienced and resolved tarnishing of Aluminium surface upon cleaning with DI water + saponifier. The aluminium surface is protected with conversion coating (clear) which is turning black when exposed to saponifier solution.
Electronics Forum | Wed Apr 26 10:27:37 EDT 2006 | slaine
weve hand soldered a few components that were tarnished with no problems, also the tarnish is electrically conductive if it helps.
Electronics Forum | Wed Nov 10 10:41:57 EST 2010 | esoderberg
subject board fabrication calls for .05 -.125um of gold over 2 - 5 um of nickel. When doing double sided reflow using same profile, parts of the gold are tarnishing and causing test pad failures. any ideas as to the cause?
Electronics Forum | Thu Nov 11 14:29:18 EST 2010 | davef
When you say 'tarnished,' is that based on: * Appearance of the gold over-plate * That you can't get good contact during ATE processing ... OR ... * Something else?
Electronics Forum | Wed Oct 15 07:31:29 EDT 2008 | davef
Similar to Jax's comment, concern yourself with the the activity level of the flux. A more active flux would be more aggressive in removing tarnish. Certainly, the choice depends on the type and amount of tarnish. Probably, you need to consider your