Electronics Forum: immersion silver wetting (Page 1 of 42)

PCB immersion silver discolouration

Electronics Forum | Mon Sep 22 15:32:20 EDT 2008 | davef

We see this fairly often. It doesn't affect solderability. Our analysis makes us think this coloration is copper. The reason copper appears on the surface may be that heat cycles increase the thinness and porosity of the immersion silver [IAg] coatin

PCB immersion silver discolouration

Electronics Forum | Tue Sep 23 10:06:29 EDT 2008 | Sean

Hello Vlad, Davef, Your valuable inputs are much appreciated. Many thanks, Sean.

PCB immersion silver discolouration

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

PCB immersion silver discolouration

Electronics Forum | Sun Sep 21 10:55:52 EDT 2008 | vladig

As long as the surface is solderable, you should be fine. Silver tarnish a well0-known thing. Make sure, though, there is no sulfur (S) "around". Regards, Vlad

Re: silver finishes on pcbs

Electronics Forum | Thu Dec 14 10:14:04 EST 2000 | PeteB

Jacqueline, Asuming you mean immersion silver: Advantages - Very flat finish compared to HASL, more easily solderable than bare copper with OSP and more process tolerant than this in our experience, reasonable shelf life, cheaper than immersion gol

BGA non wetting

Electronics Forum | Tue Sep 14 04:00:12 EDT 2010 | genesan

Hi Sir grahamcooper22, There should not a issue in stencil since i had open the aperature 1:1(one to one).Futhemore this is HASL pcb coating as now our customer had convert to immersion silver.I had do comparison between both and found HASL wetting n

BGA non wetting

Electronics Forum | Wed Sep 15 20:59:23 EDT 2010 | genesan

hi All, Here i snap shot previous PCB(HASL) and current PCB(Immersion Silver).Base on the photo it could be PCB oxidize cause the non wetting?

imm. silver

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

imm. silver

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

BGA non wetting

Electronics Forum | Tue Sep 14 14:07:45 EDT 2010 | grahamcooper22

Hi Gani, HASL is normally very good for solderability providing there is a good consistent coating of HASL on the pcb pad. But it is not unusual to have a very thin coating of HASL on the pad and this is poor for solderability. You then have tin/copp

  1 2 3 4 5 6 7 8 9 10 Next

immersion silver wetting searches for Companies, Equipment, Machines, Suppliers & Information