Electronics Forum | Thu Jan 27 14:49:53 EST 2000 | Glenn Robertson
Tuan - One of the reasons I suggested pre-tinning (aside from the negative effects of Gold on appearance and reliability) is the known slower wetting of Sn/Ag and Sn/Cu alloys as compared to Sn/Pb. If you don't have to be Lead-free, the high Lead
Electronics Forum | Sun Jul 29 08:36:39 EDT 2001 | davef
You have provided very little information. Two similar possibilites come to mind: poor pad solderability protection and old boards. POOR SOLDERABILITY PROTECTION: Maybe the nickel plating under the gold is oxidized, contaminated, or otherwise very
Electronics Forum | Fri Sep 01 04:30:42 EDT 2000 | Gyver
Hello Dave, The gold fingers are on graphic cards. What did you mean by DI water? I need to know that very soon, thanks a lot! Sincerely, Gyver
Electronics Forum | Tue Sep 05 16:16:18 EDT 2000 | Dave F
Yeh, gold fingers are always on any kind of cards. I just can't figure-out why.
Electronics Forum | Mon Aug 21 20:17:08 EDT 2000 | Dave F
Hey Gyver: Oooow, using a pencil eraser has to take time. I would hate to be the person responding to your customer trying to explain the pencil eraser shreds accidentally left on the board. Awww, just spritz it with DI water and wipe it off with
Electronics Forum | Sat Sep 02 10:18:16 EDT 2000 | Dave F
Yanno, I just thought of an addition to #3 above. Back in the ol' days (before computer drawing) there were rooms full of people, generally guys (with plastic pocket protectors holding colored pens and ... ) leaning on drawing boards, doing whatever
Electronics Forum | Sat Sep 02 09:59:39 EDT 2000 | Dave F
Hey Gyver: I was just spoofin' ya about the deionized water (DI). Water of any type will probably make your solder connections go white. I posted your question to Dr. Lee on the latest OnBoard Forum. I suggest you check his responses. I short he
Electronics Forum | Thu Jan 20 21:29:48 EST 2022 | stephendo
Copper gets etched in a photographic manner. ENIG is an additive process. Nickel gets added then gold gets added on top. Therefore it is not a matter of over etching. It is a matter of not enough gold added. The layer of gold ideally is as thin as po
Electronics Forum | Wed Jun 30 17:58:01 EDT 1999 | Boca
| My guess would be trapped flux continuing to be active after soldering. Is the tarnish there immediately after exiting the machine? Do you remove the mask and wash right away? If the solder is reflowing under the mask on the component side it wo
Electronics Forum | Fri Nov 13 20:17:35 EST 1998 | Chuck Garth
| | I believe that gold fingers on my circuit boards are being | | contaminated and need to clean them with some chemical | | solution. Any recommendations. | | | Chuck: What is the type and source of your contamination? Dave F | We are using a s
