Electronics Forum: tarnish (Page 1 of 12)

Tarnish Occuring after Washing???

Electronics Forum | Thu Jul 21 09:49:28 EDT 2011 | kahrpr

what exactly is tarnishing parts, pads, solder joint?

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 Tin Tarnish

Electronics Forum | Fri Aug 08 06:44:33 EDT 2003 | Matt Kehoe

Emergency!!! We have a small run (5) of very dense boards that have an immersion tin finish. They were built in April/May and have a heavy tarnish appearance on them, smd pads and through holes. We are being asked to apply ssd to the surface mount pa

DI Water Tarnish On Metal Parts

Electronics Forum | Wed May 20 15:10:35 EDT 1998 | Dave F

We notice that DI water seems to tarnish or discolor the metal packaging on crystals and DIN connectors. Our marketing types like the shiney metal surfaces. We don't want to hand solder these parts after washing. Any suggestions? Dave F

imm. silver

Electronics Forum | Fri Aug 30 11:53:12 EDT 2002 | genny

Possibly this is tarnish? Silver finish requires a bit more care in handling or packaging - to avoid contact with sulphur which may cause tarnish. Some cardboard boxes gas out enough sulphur to cause a problem. Possibly look at your method of stora

Tarnished surface upon cleaning with DI water + saponifier

Electronics Forum | Wed Dec 17 16:12:01 EST 2003 | Ashok Dhawan

Anyone who has experienced and resolved tarnishing of Aluminium surface upon cleaning with DI water + saponifier. The aluminium surface is protected with conversion coating (clear) which is turning black when exposed to saponifier solution.

Component Terminals with silver plating

Electronics Forum | Wed Apr 26 10:27:37 EDT 2006 | slaine

weve hand soldered a few components that were tarnished with no problems, also the tarnish is electrically conductive if it helps.

tarnishing gold surfaces

Electronics Forum | Wed Nov 10 10:41:57 EST 2010 | esoderberg

subject board fabrication calls for .05 -.125um of gold over 2 - 5 um of nickel. When doing double sided reflow using same profile, parts of the gold are tarnishing and causing test pad failures. any ideas as to the cause?

tarnishing gold surfaces

Electronics Forum | Thu Nov 11 14:29:18 EST 2010 | davef

When you say 'tarnished,' is that based on: * Appearance of the gold over-plate * That you can't get good contact during ATE processing ... OR ... * Something else?

solder paste selection for an oxidized pin?

Electronics Forum | Wed Oct 15 07:31:29 EDT 2008 | davef

Similar to Jax's comment, concern yourself with the the activity level of the flux. A more active flux would be more aggressive in removing tarnish. Certainly, the choice depends on the type and amount of tarnish. Probably, you need to consider your

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