From: Allen Mulvey <allen@amulvey.com>
To: 'Microcontroller discussion list - Public.' <piclist@mit.edu>
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Date: Tue, 16 Jun 2020 13:17:46 -0700
Subject: [OT] soldering mild steel sheet, galvanic corrosion?
Thread-Topic: [OT] soldering mild steel sheet, galvanic corrosion?
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Try to find an old time auto body man. He will be able to tell you
everything you want to know. My father used to solder the replacement panel=
s
on cars. Back then the bodies were tin plate rather than galvanize. He had =
a
couple of blowtorches (gasoline) heating some large "coppers" which he
rotated through for the actual soldering. I still have a can of "Nokorode"
flux that he used. He also had a couple of acid based fluxes but I don't
know how he picked the right one for the job. Most of his solder was 60%
lead and 40% tin. I used to borrow it for electronic projects.=20

Unfortunately my father died several years ago so I cannot ask him about it=
..

Allen
Ps: Sorry Bob I keep forgetting to remove that tag.

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Jason White
Sent: Tuesday, June 16, 2020 6:39 AM
To: Microcontroller discussion list - Public.
Subject: [CAUTION: Failed DKIM Test][OT] soldering mild steel sheet,
galvanic corrosion?

Hi everyone,

I'm researching soldering/brazing thin steel sheet metal for a hobby
automotive project. (as an alternative to welding and spot welding*) The
purpose to is create a mechanical joint on a floor panel. The mechanical
joint will be subject to road salt spray.  I am trying to predict the
effects of corrosion.

As far as I can tell the type of sold/braze can have a big impact on
galvanic compatibility. Leaded solder looks fairly close to mild steel on
the "anodic index", I can't find any information for tin solder, and silver
based solder and bronze braze appear to be far away (promoting corrosion).

Does anyone have any input on the best solder/braze chemistry from a
corrosion perspective on mild steel?


*currently am not equipped with the correct welding equipment for sheet
metal, but am equipped to solder/braze.


--=20
Jason White
--=20
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--=20
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