Electronics Forum | Sat Sep 20 07:11:28 EDT 2008 | Sean
Hello All, I used to hear that PCB with immersion silver finishing, its non component location pads, tend to be discolour (Yellowish) after went through heat cycle, such as reflow oven. However, if the component solderbility on the PCB is OK, can w
Electronics Forum | Thu Jun 16 17:02:40 EDT 2011 | boardhouse
The finish looks like Immersion Tin or Silver. if its lead free Hot air - could be issue of to high of a Tin Content. find out what brand of Hasl they are using. SL100 Example. Is this tarnished look only being seen after assembly or have you seen
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 | 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 | Wed Aug 05 07:46:46 EDT 1998 | Earl Moon
| We have mixed to negative feelings about Omikron, but I beileve it is due to problems with the board fabricator rather than the process itself. When done properly, our Omikron boards have had very good solderability. However, we have had several
Electronics Forum | Thu Apr 14 06:00:01 EDT 2005 | bryan
The shelf life of immersion silver is 6 to 12 months in good storage conditions. The finish is usually coated with a protective layer that inhibits oxidation (like with copper OSP). Care must be taken when handling the boards as the protective la
Electronics Forum | Tue Aug 20 18:15:02 EDT 2002 | davef
Haaaaa!!!! Soldering to plastic!!!! An apt analogy!!! I like to compare it to soldering to dirt. Some thing. In fact, you are soldering on nickel, when soldering on many things. It�s just that the gold, er Pd, flash enables the wetting mechanism
Electronics Forum | Fri Aug 11 22:14:59 EDT 2017 | dawson
Hi Adonys, What's ICP 1-3? Do you mean IPC? 1. Excess Plating- no excess, but filled with something which generated in the process of copper plating. 2. Dark Vias - it's oxidized. and the solder mask printing is not aligned. The board is failed. M
Electronics Forum | Wed Feb 28 14:25:33 EST 2007 | Bill
We have a board that uses a solder pad for one of the contacts of a button battery and had no problems when we were washing the boards. We are now using a no-clean flux and find that on a bunch of boards there is a coating of flux covering the pad s
Electronics Forum | Mon Mar 17 18:11:32 EST 2003 | davef
Converting to immersion silver is the best solution to the "black pad problem".
