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Nov 4, 2019 | As a manufacturer, I prefer plated nickel gold, electroless nickel immersion gold, immersion silver and palladium. These surface finishes are the best options to replace leaded surface finishes. These surface finishes can withstand higher temperatures and give out consistent performance over a long
Feb 18, 2019 | Thanks. Something to think about!
Feb 17, 2019 | Post Reflow changes To Silver Immersion Copper Traces On PWB on this kind of stuff. Two major suppliers of immersion silver technology are: * MacDermid * Electrochemicals, Inc
Feb 16, 2019 | Post Reflow changes To Silver Immersion Copper Traces On PWB Your silver immersion layer is dissolving in the solder. I presume this is what is meant to happen. But with copper tracks underneath that should be fine. Does your SAC305 cover all of the pad. If so no problem. If not then you will need to flux your joint to do any further soldering or repair
Feb 16, 2019 | Post Reflow changes To Silver Immersion Copper Traces On PWB 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 MICRO INCHES THICK The traces exhibit what appears to be a "tarnishing" after the PWB is soldered into a housing using SAC305. After the reflow process the traces change color from dull silver to a dull "yellow". I believe this presents issues for further solderability.
Jan 31, 2018 | Hi Rob, I did check with the board house, and the confirmed that there was no Nickel plating, but that the silver went straight onto the copper in their immersion silver process. Interestingly I've even tested an unplated sample from that board house and even that can be magnetized. I wonder
Jan 31, 2018 | Hi Fluxgate, Doubt it's the laminate unless you have embedded components. Nickel is ferromagnetic (can be magnetised),so I would expect some level of magnetism in ENIG, but not silver. Are you 100% sure it was immersion silver and not something similar looking? Also years ago saw papers
Aug 7, 2017 | Immersion Silver Issues Are you seeing this on bare PCBs or after assembly? with Immersion silver, the finish over the copper should be very thin and uniform, that's the main advantage of ImAg. You should not be seeing excess plating filling vias unless: A)Its HASL, not immersion silver B)Your seeing solder from
Aug 7, 2017 | Immersion Silver Issues The vias are filled with the silver plating, it's excess plating and i wanted to know if there was any issues with ICP
Aug 4, 2017 | Hi Adonys, Can you attach the photo for check?
Aug 4, 2017 | What are the vias somewhat filled with? Can you explain in greater detail the effect that you observ
Aug 4, 2017 | Immersion Silver Issues So i am a quality inspector and i am having issues with the immersion silver PCB. I have found the via holes to be somewhat filled and i wanted to know if anyone knew it this is a CLASS 1, 2, 3, ICP DEFECT or what it is at all?
Aug 25, 2015 | Immersion Silver - surface problems (need experienced help) Adam, We have very recently experienced poor wetting on immersion silver as well. I would be very interested to talk to you offline, however I do not see the option to private message forum members.
Apr 30, 2015 | Let us know how immersion silver works for you.
Apr 29, 2015 | I have experience of Immersion silver and it's even more sensitive for all disadvantages mentioned above than Immersion tin. You can not go wrong with ENIG. It's little more expensive but in the end you save some bucks when you don't have to rework or scrap boards.
Apr 29, 2015 | thankyou for you answer dude. As you mentioned in your answer that immersion tin finishing gonna cause many problems. So, immersion Tin option is ruled out for my purpose. So, immersion Silver is the option left for my purpose But, I have checked for the pricing of immersion silver and immersion tin and i came to know that cost of immersion silver is very high compared to Immersion Tin. So, Can you suggust me any other finishings apart from immersion silver & ENIG for my purpose. Regards, Anirudh THABJUL
Apr 28, 2015 | thankyou for your answer. I came to know that "ENIG/ENEPIG is much costlier than Immersion Silver and Immersion Tin. So, my company doesn't allow me to use ENIG/ENEPIG". So, i will suggust my company to use Immersion silver or Immersion tin. Regards, Anirudh THABJUL
Apr 27, 2015 | finish" blocks corrosive element in the environment At the end of the day, ENIG is a good choise of Electroless Nickel Immersion Gold (ENIG, ENEPIG) Immersion Silver, Immersion Tin and Organic Solderabilty Preservatives OSP
Dec 21, 2014 | oh we also immersion silver finish our PCB's.
Feb 12, 2014 | Immersion Silver Contaminants Has anyone ever encountered contaminants from the immersion silver process, whether it be from the board house or not...as it relates to conformal coating. The failure mode is severe de-wetting of acrylic conformal coating. All over solver resist, tops of components, pretty much everywhere
Sep 14, 2010 | 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 not so good as immersion.May this one of the root
Jul 6, 2010 | What type of finish are the PCB's? HASL, tin immersion, silver immersion,........we've seen all the above problems with HASL finished boards. Usually either reheating w/ a soldering iron or "burnishing" with a scotch brite pad has worked for us.
Apr 26, 2010 | Silver Immersion Finish - Moisture bake out guideline? 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 got exposed. We were told that immersion silver
Apr 24, 2010 | Silver Immersion Finish - Moisture bake out guideline? 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-tarnish-on-immersion-silver-board-finishes_july-31.pdf [The Study, Measurement, and Prevention of Tarnish on Immersion Silver Board Finishes, L Toscano & D Cullen, Mac
Sep 17, 2009 | Lead Free Immersion SIlver PCB-->Creeping Corrosion All, We know that incomplete immersion silver could potentially lead this creeping corrosion. Is there any way to check bare PCB for incomplete immersion silver coverage, especially on the via hole area? Thanks, Sean.
Sep 8, 2009 | Maybe your solder mask supplier can provide additional background
Sep 3, 2009 | Lead Free Immersion SIlver PCB-->Creeping Corrosion Creeping corrosion occurs on bare metal. Most commonly, it is seen on boards with thin protective coatings [eg, bare copper, immersion silver, organic solderability preservative]. Look here: * enthone.com/docs/AlphaSTARCreeping.pdf * circuitree.com/.../BNP_GUID_9-5-2006_A_10000000000000550300
Sep 3, 2009 | Lead Free Immersion SIlver PCB-->Creeping Corrosion Hi All, I have few questions about creeping corrosion that potentially happen on lead free immersion silver PCB as below: 1) What test that we can conducted to verify whether the failure we seen is due to creeping corrosion? 2) I heard that lead free Immersion silver PCB has high potential
Nov 12, 2008 | Are there better options? Dude, EVERYTHING else is a better option. Gluing aluminum foil down to the bare copper would be a better option. ENIG (Electroless Nickel Immersion Gold), Immersion Silver, Immersion Tin, and OSP all provide flatter surfaces then HASL. However, there's a cost impact
Sep 23, 2008 | Hello Vlad, Davef, Your valuable inputs are much appreciated. Many thanks, Sean.
Sep 21, 2008 | PCB immersion silver discolouration 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
Sep 20, 2008 | PCB immersion silver discolouration 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 we accept it even some of non component pad
Sep 12, 2008 | Immersion Silver - Yellowing While you're waiting for others to reply, check these recently posted threads on discolored immersion silver [IAg] here on SMTnet: * http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=56220
Sep 12, 2008 | Immersion Silver - Yellowing We have a double sided board with Immersion Silver Plating. After reflow the Silver turns a yellowish color. It still wets good, and the yellow color will polish off with a pencil eraser. Has anyone seen this, or know the cause?
Aug 27, 2008 | 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. The supplier doesn't add the anti-tarnish sheets Imm Silver tarnish?
Aug 22, 2008 | 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 an anti-tarnish after immersion silver before
Aug 22, 2008 | Hi All, I have question regarding the PCB. My PCB is immersion silver furnished. I found out that the board is darkening from immersion silver to yellownish colour after exposed to the environment. From my finding, i think it may be caused by the sulphur contents. Am i right? Any others ways
Mar 14, 2008 | Samir, To correct some misconceptions on the answers to your question, and "what you know from experience": With both ENIG (Electroless Nickel/Immersion Gold-IAu) and IAg (immersion silver), soldering does not take place to the gold or the silver. When the molten solder contacts the gold comes in contact with immersion silver (IAg), the 10-18 uinches of silver immediately dissolves into the molten solder, and then a small amount of the copper underneath the silver dissolves into the solder also, again forming the IMF. One does not solder to either the gold or the silver. Those noble , they are not formulated for that purpose. There are no black pad issues related to immersion silver finish. Copper's rate of dissolution into solder is much faster than nickel's rate of dissolution. So, when soldering to IAg finish (immersion silver over copper) you are forming an IMF with copper, and copper readily
Jan 17, 2008 | Interleaving paper for Immersion Silver PCBs Google => "silver saver" paper It can be purchased as an industrial product: * corrosionvci.com/corrosion_control_vci_paper.htm * daubertcromwell.com/pdf/silverg.pdf * corrosionprotection.net/corrosion/proddetail.php?prod=silversaver48R * jamesdawson.com/Silver%20Saver.pdf In our notes, we have a reference to a NPL presentation [npl.co.uk/ei/presentations/storage.pdf] on the results of a study of the effect on solderability of 'silver saver', but the link doesn't seem to work. Chris Hunt at NPL can probably give you a lead on the results.
Jan 17, 2008 | Interleaving paper for Immersion Silver PCBs All, Can someone help find a source for purchasing interleaving/packaging paper for Immersion Silver boards (sulfur free + ph neutral ..). Thank you!
Jul 28, 2007 | Sterling is a Mac Dermid [www.macprintedcircuits.com/final] product. They should be able to help ma
Jul 26, 2007 | HI..anyone who can give me a link to enlighten me on this plating for pb-free..Most people say this
Jun 18, 2007 | Grant, i have heard of a few cases where the PCB is "reworked" by the PCB house, where the immersion silver that did not wet to the base copper was reworked by just putting immersion silver on top of the non-wetted immersion silver. I know your PCB is ENiG, but this may be a possible scenario
May 14, 2007 | I am a CM, We do not use White tin either, we have had numerous solderability issues with this finish, We all agree when done correctly it is good, however I am at about 10% correct and 90% have issues. We currently use Immersion silver and Gold for ourr RoHS PCBAs I think white tin is fine Immersion White Tin
Jul 31, 2006 | Never changed anytihgn when we switched to Immersion silver. Have run approximatelky 10,000 16mil pitch devices to date with immersion Silver PCB, stainless, chempolished 5 mil stencil, and pbfree paste (OM338). Russ Imm Silver & Screen Printing
Jul 31, 2006 | I am printing convention leaded paste on onto Immersion Silver board. Board has 16mil fine pitch devices. I am having a problem getting the print to stick to board. Or I am having a problem with the stencil. Never experienced this with jobs before, but this is a new job, new board and a new Imm Silver & Screen Printing stencil (and new stencil house!). My question is, do you guys do anything different to your stencils when printing on Imm. Silver? Stencil house is suggesting a different metal foil besides stainless.
Jul 26, 2006 | Immersion Silver Board Finishes This is for all boards not just our immersion silver PCBS. We went out bought a shrink wrap and anytime they get open the stock people have to rewrap them. We had to do this in order to get a couple new customers a couple years ago and now its just a common pratice.
Jul 25, 2006 | Immersion Silver Board Finishes 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 and tested as a control lot through ORT type testing. There was tarnish present on PCBs prior to assembly and test. We have found that if we keep in silver saver paper we have yet to find issue with PCBs at all. no help, but your customer needs to listen to you. Ask them why they require this and what substantiates it Russ
Jul 25, 2006 | Immersion Silver Board Finishes Good morning, I got a question regarding Immersion Silver Board Finish. It has been imposed on us by our customer that we must manufacture PCB through the SMT process within 24 hours of breaking the seal on a bag of PCB containing Immersion Silver. Is this common? What we have been doing
Jun 21, 2006 | I've been building boards for a long time and have never heard of anyone using electrolytic silver. Immersion silver would be 8-18 microinches thick. Plated silver would be significantly thicker (min a couple tenths - .0002" and up). So you may be able to check the thickness. The suppliers cert may be refering to lead free HASL which could have small amounts of silver in it but that would look like HASL.