Most of the fluxes that that'll work include some degree of Zinc chloride, Ammonium chloride, hydro chloric acid and a wee bit of ionic surfactant.
Strangely enough, I remember an ASM book that recommended a brief soak in an aqueous solution of 1-2% HCL followed by another quick dip in 1-2 % caustic of some type to solubilize the post soldering residues.
Rich K
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Tuesday, May 14, 2019 8:46 AM
To: [log in to unmask]
Subject: Re: [TN] Soldering to stainless steel
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Hi Richard
A long while ago I had a small R&O job where we had to solder connectors to stainless cans. SN63, mil aviation application. The flux Alphametals recommended was pretty scary, decanting it into a dispense bottle we had our guy in a full apron, face shield, mask... bought a gallon, used a tablespoon, paid to dispose of the remainder. Ah well.
It did solder well though, nice fillet and wetting looked good. No idea about reliability, but we were replicating what had been done some 15 years previously, I would hope they had done the homework then. We tinned the can first so we could be sure of the solder wetting to the stainless, and then installed the connector.
Had to use a huge soldering iron, an "American Beauty" brand unit.
Graham Collins
Senior Process Engineer
Sunsel Systems
(902) 444-7867
On 5/14/2019 9:54 AM, Stadem, Richard D wrote:
> Has anyone ever tried soldering to SST, like small connector posts, etc?
> Is it even possible to form an IMF using standard Sn63 or SAC305, or are there other alloys that can be used at higher reflow temps? How reliable is the connection?
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