Electronics Forum: immersion silver baking (Page 1 of 29)

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

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

Immersion silver life span

Electronics Forum | Wed Apr 13 05:48:52 EDT 2005 | charly

hi' i need advise on immersion silver PCb shelf life. 1) what is the shelf life for Immersion silver PCB? 2) iF PCB expire, can we bake the immersion PCB? what temp & duration? 3) How long can we keep the pCB again after rebaking? (with vacuum seal)

Immersion silver life span

Electronics Forum | Fri Apr 15 05:52:20 EDT 2005 | charly

hi Jon, does it mean the protective layer is coated after the immersion silver process? if we need to bake the PCb due to moisture issue, then we can not hold the pCB long due to the missing protective layer even with vacuum seal environment

Immersion silver life span

Electronics Forum | Mon Apr 18 20:44:30 EDT 2005 | davef

Charly: Why do you "need to bake the PCb due to moisture issue", if you're not going to use the board? Why bake the board, just to put it back in storage, absorb moisture, and require baking again?

Immersion silver life span

Electronics Forum | Wed Apr 20 01:08:16 EDT 2005 | charly

actually, i received a shipment from supplier where the vacuum seal was puntual and the HIC is out of order, the supplier ask me to bake and keep back into the store, but i worry is there any quality impact if i do so?

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

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