Electronics Forum | Fri Aug 30 16:25:21 EDT 2002 | davef
Imm silver holds-up to multiple thermal cycles very well. The things, we guess, are happening to make imm silver tough to solder after heating and sitting are: * Oxidation of the silver. * Reduction of the co-deposited organic anti-tarnish [used in
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 | Thu Aug 29 17:51:43 EDT 2002 | nifhail
I have seen several Imm Ag pad on the assembled board which have a copper colorleaching through the silver plating This happened on the pad which was not deposited with paste during the assembly process. Don't know if it is a problem, but we only h
Electronics Forum | Thu Aug 29 20:02:58 EDT 2002 | davef
Often assemblers leave areas unsoldered for future component additions, modifications, and test points. On imm silver boards, these unsoldered areas become a real bear to solder/test later in life. One way to avoid that problem is deposit some solder
Electronics Forum | Fri Aug 30 04:44:31 EDT 2002 | jason
Hi Dave, Why does it become " a bear" if u leave it unsoldered ?? Does it oxidise or something ?? Question (1): Does Ag imm. PCB need to use Solder paste with AG ?? If yes, why. Question (2): Does Ag imm pcb have poorer surface finishes than HAS
Electronics Forum | Sun Sep 08 19:58:57 EDT 2002 | dasal
My specialty. Your right, Most corrugated contains S02 and the pallet is usually out gassing formic acid as well. Not a great environment for silver. Original press release follows: Reactive Polymers At AT&T Bell Labs, John P. Franey has developed
Electronics Forum | Thu Aug 12 20:32:44 EDT 2004 | usdigital
Indy, We use Palladium silver surface finish parts for silver epoxy attached parts only. It is our understanding that this finish is not for solder, but only silver epoxy attach. I expect that is you problem. Dave
Electronics Forum | Wed Jan 15 11:42:57 EST 2003 | burb1999
we have recently been trying silver composition on our pads with our PCB boards. I am wondering what if any characteristics are different from tin etc... I have found with profiling the board it to be about the same temps. but getting granular looki
Electronics Forum | Thu Oct 18 11:20:52 EDT 2001 | furrer
1. Does anyone has seen results for the reliability of Solder Paste containing less than 1% Silver. (It is in use for soldering 0402 components because of Tombstones. 2. Is it common to use eutectic Solder Paste SnPb, without any silver, for regular
Electronics Forum | Fri Jan 24 11:05:38 EST 2003 | johnw
I fyour just using Sn/Pb in your paste even using nitrogen will lave you with slightly grainy joints. The silver from your PCB will disolve into the Sn/Pb at 'uncontrolled' rate what I mean is depending on the temperature and time above liquidous the
