Electronics Forum: silver immersion tarnish (Page 4 of 30)

Qualification requirements for immersion tin finish

Electronics Forum | Wed Aug 30 08:20:40 EDT 2006 | Bob R.

Are there any standard qualification/acceptance requirements for immersion tin board finish? J-STD-003 calls out temp/humidity preconditioning followed by solderability testing which is similar to what we have in our (ancient) internal documents. O

can silver plating be used as barrier when soldering brass to copper? silver plate the brass?

Electronics Forum | Thu Jun 08 16:12:19 EDT 2017 | davef

Your plater's recommendation should work fine. Your simple copper plate will work, but you'll be stepping into fighting a copper tarnish battle. Silver over the copper is a better choice. I was thinking a silver thickness of a minimum of 3 microns

Silver Immersion Finish - Moisture bake out guideline?

Electronics Forum | Sat Apr 24 10:43:31 EDT 2010 | davef

Hege: Sounds like this customer is a putz. Ask the putz to sign a release, acknowledging responsibility. Here's a couple more links on imm silver: * http://www.pcbdesignschool.com/wp-content/uploads/2009/08/the-study-measurement-and-prevention-of-t

Silver Immersion Finish - Moisture bake out guideline?

Electronics Forum | Mon Apr 26 14:40:07 EDT 2010 | blnorman

We had one product that used immersion silver plating. There were a couple of instances where we saw tarnishing, and elemental analysis confirmed the presence of sulfur. These boards did have the anti-tarnish sheets between boards, but somehow they

PCB becomes darken (yellownish)

Electronics Forum | Fri Aug 22 10:01:52 EDT 2008 | robinj

I have seen this problem before. If the color is yellow usually it is caused by moisture left on the boards from poor drying after immersion silver. One of the ways to get rid of this is by dipping in acid cleaner solution. If the board supplier uses

Immersion Silver Board Finishes

Electronics Forum | Tue Jul 25 10:04:22 EDT 2006 | russ

There reasoning is ignorance. They are most likely concerned about tarnish on PCB surface. We have let immersion silver PCBs sit out open for 10 days in a noncontrolled enviromnent. We had no issues with these assemblies and they were segregated a

PCB becomes darken (yellownish)

Electronics Forum | Sat Aug 23 08:43:32 EDT 2008 | davef

Ugh, there are more reasons that immersion silver [IAg] to go yellowish than pigs at the county fair. That aside, sulphur is one of the reasons, as you say. The sulphur can be from a variety of sources, such as: * Pollution in the air * Ill advised p

Imm Silver tarnish?

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.

Immersion Palladium Surface Finish

Electronics Forum | Thu Jan 12 17:35:34 EST 2006 | russ

We use immersion Silver for all of our lead free PCBs. They come in the "silver saver" paper you speak of and we have found that they will tarnish after 7 days in the open enviroment. Even with this tarnish we experienced no reflow problems. We are

Post Reflow changes To Silver Immersion Copper Traces On PWB

Electronics Forum | Sat Feb 16 07:21:17 EST 2019 | SMTA-Joe

I am experiencing a "tarnishing" issue on PWB traces that may be causing problems with component reflow. The PWB traces are made to the following spec: SOLDER MASK OVER BARE COPPPER WITH SILVER IMMERSION PLATING PER IPC4553, PLATING TO BE 8-12 MIC


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