Electronics Forum | Wed Sep 18 17:21:19 EDT 2002 | slthomas
Dave, anything besides gold embrittlement to be concerned about if that concentration is exceeded? Never tried the stuff.
Electronics Forum | Wed Sep 18 18:10:15 EDT 2002 | davef
IMHO, this finish is more cosmetically appealing than technically desirable (and VERY profitable for the PCB maker). That editorial comment aside, you're correct. Increasing the concentration of gold: * Hardens the solder. * Increases the liquidou
Electronics Forum | Tue Feb 22 12:12:01 EST 2005 | jimby
We are looking at replacing some solder pots (wave type)for pretinning components. What type are people out there using?
Electronics Forum | Fri May 06 10:38:28 EDT 2005 | jimby
Make sure that whoever is pretinning leads are not using a water soluble flux. If they are, make sure parts are being cleaned immediately upon cooling
Electronics Forum | Wed May 03 11:39:44 EDT 2006 | Chunks
"and dip it in your solder bath for 10-20 seconds." Do you pre-tin them first or just dip them in regular solder? "You can't talk to molten solder, but surfactant will listen." "Remember, we're all in this together."
Electronics Forum | Mon Mar 12 08:27:00 EDT 2007 | rgduval
Have you checked the parts for contamination? Are the voids out of spec? IPC allows some voiding, especially with lead free solder. Component contamination can cause this to repeat, as well. Try pre-tinning the component in question, and see if s
Electronics Forum | Wed May 05 08:50:37 EDT 2010 | flipit
You will want to look at the Mil Specs. I believe they are all available online in pdf format at no cost. I am not certain what the latest spec is but Mil-Std-2000 absolutely has a section on this.
Electronics Forum | Thu May 16 09:39:25 EDT 2013 | eniac
Guys, thank you for your advice about Adipic Acid, it's an amazing! In my country one small box of Hakko Pretinning Solder paste (FS-100) costs USD30, 1 kg of this axid costs USD5.5 .
Electronics Forum | Mon Sep 18 01:47:18 EDT 2017 | bukas
I would go with wire thickness + 0.4 to 0.8 mm for pad width, and pre-tinned lenght + 0.5mm what seems to me like problem is that it can easily roll off the pads in reflow oven
Electronics Forum | Wed May 11 20:38:18 EDT 2022 | donovan03608
The leads on the FPC are pre-tinned on both sides with SAC305. The receiving leads are AU. We do not experience any wetting issues that would suggest oxidation.
