Electronics Forum | Tue Mar 19 07:48:26 EST 2002 | PeteC
Have QFP at o.5mm pitch with leads too oxidized for the flux in the paste to de-oxidize(in stock for boo koo time). I saw three companies on the Internet that can "tin" (solder coat) the leads. Does anybody have any experience with having this done t
Electronics Forum | Wed Dec 12 07:38:04 EST 2001 | smtspecialist
I have observed the same thing with solder composition in this case I am using 63/37 NC which is giving good results usualy. The liquid tin, product from MG Chemical that I used is to tinplates copper circuit on PC boards. I tried on few relays, it
Electronics Forum | Fri Dec 07 07:32:39 EST 2001 | smtspecialist
Yes it's a product from SG Chemicals, it does tin the leads but they stay doll, they don't come nice and shinny. So that tells me it doesn't clean off the oxidation it just add a tin coat to the lead itself, short term results are great but what abou
Electronics Forum | Tue Mar 19 14:23:44 EST 2002 | caldon
PETE - Since you are local to ACI/EMPF you can take a run over there and speak with Greg Parks,PhD on ROSA. His phone number is 610-362-1200 x 267 or email gparks@aciusa.org. This method is much better than the "re tinning". They can actually revert
Electronics Forum | Wed Dec 05 11:35:15 EST 2001 | smtspecialist
What is the best way/material to clean leads with 20% copper exposed that have been sitting in a stock room for a couple of years. My process uses NC flux 263 from AIM and I want to stay with the NO-Clean as much as possible!
Electronics Forum | Thu Dec 06 19:51:43 EST 2001 | davef
No. Assuming your talking the MG Chemicals product, MG Chemicals makes innovative products and is a very innovative company. Let us know how it works, please.
Electronics Forum | Tue Dec 11 16:09:02 EST 2001 | mparker
What is the composition of tin to lead in the "Liquid Tinner"? It's been my experience that the higher the tin, the duller the solder appears. I've used 63/37 and 70/30 that both look shiny, whereas 80/20 does look dull. Just another thought to cons
Electronics Forum | Thu Mar 28 11:06:49 EST 2002 | Tony Fox
Our company carries out this service for major OEM and CEM's Our web site address is http://www.retronix.co.uk Every device after it has been re-tinned gose throught a vision inspection system were it is inspected for coplinarity etc, we also re-ball
Electronics Forum | Fri Dec 07 15:17:06 EST 2001 | davef
Dull / shiny, I�m not sure that�s a proper indicator. If �Liquid Tin� adds a thin coat of solderable material without converting the corrosion on the surface of the lead, the corrosion will [probably] continue to increase and potentially affecting t
