Electronics Forum: contamination with immersion gold (Page 1 of 5)

Golden Finger contamination with Solder after reflow

Electronics Forum | Wed Nov 15 07:21:58 EST 2017 | stephendo

You don't clean contaminated gold fingers so much as you replace them. I once had the "cleaning" solution. It totally dissolved the gold fingers so that they could be replaced.

Golden Finger contamination with Solder after reflow

Electronics Forum | Mon Nov 13 13:49:16 EST 2017 | slthomas

Preemptively you can apply Kapton tape to protect the gold fingers during reflow. I think that's what most people do. After the fact, there are services available to clean them up but as it was described in another thread here, it is not in-expensiv

Gold contamination in solder joints?

Electronics Forum | Thu Sep 21 17:50:43 EDT 2000 | Bill Boles

Does anyone have a quick reminder for a PCB with immersion gold surface finnish going through a reflow profile: Which of the following statements is more correct? A: In order to minimize gold in the intermetallics of the solder joint, the board temp

Printing problem, water soluble paste with gold plating PCB..

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

Re: Black spots on gold finish pads.

Electronics Forum | Mon Nov 30 23:45:20 EST 1998 | Kallol Chakraborty

Hi folks , Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our inspection /te

Re: Black spots on gold finish pads.

Electronics Forum | Tue Dec 01 07:24:44 EST 1998 | Earl Moon

Hi folks , Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our inspection

Re: Black spots on gold finish pads.

Electronics Forum | Tue Dec 01 07:54:49 EST 1998 | kallol chakraborty

Hi folks , Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our inspec

Re: Black spots on gold finish pads.

Electronics Forum | Tue Dec 01 09:02:18 EST 1998 | Earl Moon

Hi folks , Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our in

Re: Black spots on gold finish pads.

Electronics Forum | Fri Dec 04 20:26:34 EST 1998 | kallol Chakraborty

Hi folks , Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Ou

Re: Black spots on gold finish pads.

Electronics Forum | Fri Dec 04 20:37:45 EST 1998 | kallol chakraborty

Hi folks , Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most

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