Electronics Forum: copper pin nickel residue (Page 1 of 4)

Soldering with Electroless nickel

Electronics Forum | Tue Nov 29 21:51:37 EST 2005 | wmeyers

I have a pin and sleeve assembly that utilizes a fusible link type of solder, Bi, Cd, Pb and Sn alloy. The pin is gold plated, the sleeve is copper alloy 725. I have had sporadic success with wetting of the sleeve during the reflow process. To improv

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

how to solder manganin 0.05mm manganin wire to a copper plate

Electronics Forum | Thu Jan 29 09:18:36 EST 2015 | davef

Nichrome, manganin, phosphor bronze etc are easy to solder ... the hard part is removing the corrosion * Manganin: 86% copper, 12% manganese, 2% nickel. Often, it's used in making cryogenic measurements, due to its low heat loss. * Select a flux for

Terminal plating

Electronics Forum | Wed Sep 01 08:27:38 EDT 2004 | davef

Zinc from the brass [Cu3Zn2] diffuses into the tin causing solderability problems. Just 0.001% of Zn in your solder can render it fit for the scrap heap. So, you need a barrier plate between the brass and the tin. Copper or nickel-plating is commonl

PCB Gold Pad Corrosion

Electronics Forum | Mon May 15 13:05:31 EDT 2017 | edhare

Pin holes in the gold can allow for corrosion of the underlying nickel and copper to form copper and nickel oxides on the gold surface (example - http://www.semlab.com/blog/?p=564. The corrosion can work itself all the way through the EN layer (exam

Why can my bare PCB be magnetized?

Electronics Forum | Wed Jan 31 12:59:53 EST 2018 | fluxgate

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 hou

Terminal plating

Electronics Forum | Wed Sep 01 05:25:34 EDT 2004 | Martin

Hello, I am looking for some advice please about how to go about plating some brass pins for a new assembly. (which will be hand soldered) I have spoken to a couple of "experts" who seem to contradict themselves.. Firstly what should I be solderin

Why can my bare PCB be magnetized?

Electronics Forum | Thu Feb 01 03:02:50 EST 2018 | robl

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 sam

QFP Coplanarity & Alloy 42

Electronics Forum | Tue Sep 30 21:00:41 EDT 2003 | davef

We're not clear on what you seek. So, as a starting point for our discussion, we wouldn't get agitated if we saw "routine" coplanarity of 4 thou. For instance: Maximum Lead Coplanarity [Altera] Package Acronym Lead material Finish Maximum Lead

Copper oxide

Electronics Forum | Thu Jul 31 15:41:23 EDT 2003 | davef

Q: Could any of you guys tell me what exactly is this greenish thing ? A: No, but is not copper oxide. Copper oxide is brown, the color of a penny [here in the US] or an untreated copper laminated trace on a board. Many copper salts are greenish in

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