True, but the original question was to only use an RMA flux....
Prepping with the Kester or similar products then removing them and then
using an RMA would put the same chemical activity or more as simply using a
water washable IA flux and cleaning onto the assembly. So although the final
soldering would be done with an RMA, the difference is mostly semantics
(prep chemical versus flux). Chemically there would be little difference to
using an IA flux only.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike McMonagle
Sent: Tuesday, August 24, 2004 3:25 PM
To: [log in to unmask]
Subject: Re: [TN] Soldering Nickel Leads
Kester makes a product called Nickel Nu for prepping nickel or Kovar
leads before soldering:
http://www.kester.com/en-us/products/prodcat_detail.aspx?pid=104
You can request a sample if you only have a few parts to do, or order a
gallon and you'll be set for a loooonnngg time. Or you can roll your own
if you don't want to buy it, it's basically hydrochloric acid and copper
dichloride diluted in DI water. Take all prudent precautions when
handling, it can be very nasty stuff. We have used it (or the homebrew
version) to prep nickel leads, then immediately rinsed with DI followed
by alcohol rinse. We then tinned the leads with the solder alloy that
the parts would ultimately be soldered with to protect them until that
point.
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Tuesday, August 24, 2004 2:23 AM
To: [log in to unmask]
Subject: Re: [TN] Soldering Nickel Leads
Possibly you can get acceptable results by mechanically abrading the
lead, (there are special tweezers with abrasive pads, or you could even
use very fine grit "wet and dry" ) followed by as high a solids content
RMA as you can find. The high solids will increase the flux persistence
and therefore working time before displacement by the solder on dipping.
Regards
Mike Fenner
Indium Corporation
T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
E: [log in to unmask]
W: www.indium.com
Pb-free: www.Pb-Free.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric Kalgren
Sent: Tuesday, August 17, 2004 9:04 PM
To: [log in to unmask]
Subject: [TN] Soldering Nickel Leads
Hey all,
I have a minor problem with a component in house. The component leads
are 19 AWG nickel and I need to connect to them using 20AWG copper wire.
I looked in the archives for previous discussions on this topics and
came away with the impression that OA flux is required. My question is:
Can I solder these parts without having to go out and get some OA flux?
We use RMA and I'm reluctant to bring in a different flux and have it
used rather than the RMA. Can one mechanically prep the leads, then
flux with RMA, then dunk in the solder pot?
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