Andy,

I know this answer is outside what most would suggest, but I offer it a something that worked on usually non-solderable materials.  I'm sure the chemists in the group will have their heads pop with this suggestion.

I haven't tried that but I have soldered stainless steel with 63/37 solder and La-Co Industries N-3 All Purpose flux found at McMaster-Carr as p/n 7696A1.  The SDS suggests it contains zinc chloride, ammonium chloride and hydrochloric acid.  I was impressed by the success of the soldering, but my application was not electronics.  It must be cleaned with lots of water.  

We did use it for soldering a drain wire to a stainless steel foil transformer shield that was then wound into the transformer.

Phil Nutting

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Giamis, Andy
Sent: Thursday, August 17, 2017 3:38 PM
To: [log in to unmask]
Subject: [TN] Soldering to 'Nickel-Silver'

Hi Folks,
Has anyone had experience soldering to 'Nickel-Silver' 
This is a ternary alloy with approximately 60% Cu, 20% Ni, 20% Zn.

If so, are there any special considerations such as flux type, pre-tinning etc...



Best Regards,
Andy
Senior Failure Analysis Engineer
CommScope
2601 Telecom Pkwy
Richardson, TX, 75082, USA