Electronics Forum: contamination on enig (Page 1 of 24)

contamination on feedthru wires

Electronics Forum | Mon Nov 13 11:31:10 EST 2000 | John Rep

I am having a problem with wetting on some feedthru wires. The problem seems to be contamination on the wires, due to the fact that the problem seems to be wire lot dependent. I have analysed it using SEM and come up with very little. Is there ano

contamination on copper

Electronics Forum | Thu Apr 15 08:23:47 EDT 2004 | prod

hi, Having put a copper socket trough a wave soldering machine, and then through a DI wash, the boards have been dried and after a few days a green residue has been noticed on the copper. any suggestions? not drying properly maybe? or could it be th

contamination on copper

Electronics Forum | Thu Apr 15 11:15:30 EDT 2004 | patrickbruneel

Pure (red) copper oxide is green, its not a residue its just oxidation. In your case water and heat will accelerate the oxidation process of unplated or unprotected pure copper. The best way to avoid this from happening is use a socket with tin or n

contamination on copper

Electronics Forum | Fri Apr 16 11:03:35 EDT 2004 | davef

Your copper corrosion is not good. It indicates that you have not done a good job in cleaning. [We assume this is a medium green color, not unlike the color of the solder mask on your board, that is almost like a translucent lacquer; rather than th

Solder contamination on Golden Finger

Electronics Forum | Thu Aug 16 13:06:59 EDT 2007 | shing

Will solder contamination related to PCB's surface finishing?

Solder contamination on Golden Finger

Electronics Forum | Sat Aug 11 13:37:02 EDT 2007 | shing

I am a fresh SMT engineer. I am now facing a problems, solder contamination on Golden Finger nearly about 1 year. I don't know what going on. I have checked the cleaningness of stencil, solder paste handling,IR re-flow profile and even PCB surface

Solder contamination on Golden Finger

Electronics Forum | Thu Aug 16 14:15:11 EDT 2007 | hussman

I agree with Doug. Stop the bleeding first, then find and stitch the wound up.

Re: contamination on feedthru wires

Electronics Forum | Mon Nov 13 20:55:11 EST 2000 | Dave F

Not too much to go on, bud. Tell us about: * Wire material, finish, insultation, etc * Wetting problem description * Why feed that the wire is used for through is important * Range and extent of the problem * Results of metallographic analysis of "g

Solder contamination on Golden Finger

Electronics Forum | Mon Aug 20 09:33:25 EDT 2007 | stepheniii

Your lighting would have to be pretty bad for it to be an issue. My gut instinct tells me you have bigger systemic issues. Operators will either be your best friend or your worst enemy. What percentage of boards have contamination? You might have t

Solder contamination on Golden Finger

Electronics Forum | Mon Aug 13 08:04:43 EDT 2007 | davef

Search the fine SMTnet Archives [on gold finger], while you're waiting for others to reply. For instance: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=42759

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