Greg, Guy
Ah, the lights come on! Electroplating - a totally different animal. I'm
embarrassed that I did not think of this possibility.
Yes, I guess with a strong enough flux you can "solder to wood."
For all the rest of my TechNet friends that replied: it is interesting to
note that several of your couched your replies in terms of soldering irons
or component leads (the latter which might be Alloy 42). I was not think
about soldering irons or leads, but was just wondering about a truly general
observation. Now I have my answers.
Thanks, everyone.
Bev Christian
Research in Motion
-----Original Message-----
From: Anderson, Greg (IndSys, GEFanuc, NA)
[mailto:[log in to unmask]]
Sent: October 22, 2001 3:15 PM
To: [log in to unmask]
Subject: Re: [TN] tin on iron and solder on iron
Bev,
I thought that the tin on cans might be plated, rather than
soldered, and found a reference to that effect at:
http://www.steel.org/containers/spc/tin_production2.htm
I cannot be certain that some aren't "hot tin coated", but the reference
seems to indicate that very high speed processes are used to electroplate
the tin to the steel.
Greg Anderson
Senior Advanced Manufacturing Engineer
GE Fanuc Automation
Charlottesville, VA 22911
Phone: 434-978-5181
FAX: 434-978-5898
e-mail: [log in to unmask]
-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]]
Sent: Monday, October 22, 2001 2:34 PM
To: [log in to unmask]
Subject: Re: [TN] tin on iron and solder on iron
OK, let me try saying this a different way:
it "seems" that the canning industry has an easy time putting tin on can
steel. Why do I have trouble getting solder to stick to a properly
preheated 100% iron surface? Is it just a matter of flux strength? Or
something else?
Bev Christian
Research in Motion
-----Original Message-----
From: Mel Parrish [mailto:[log in to unmask]]
Sent: October 22, 2001 4:17 PM
To: [log in to unmask]
Subject: Re: [TN] tin on iron and solder on iron
Dr Bev,
Not sure what your question is but for discussion. Many of the common
component lead frames contain significant amounts of iron which is plated to
enhance solderability, limit corrosion, etc.. Seems that there should be
some metallurgists out there that can lead us to understanding the
solubility characteristics but my text books discuss FeSn intermetalics
although the rate is slower that that of tin gold or tin copper. Also seems
to me that the Nickel content is important to the solder interface.
Mel Parrish
Soldering Technology International
102 Tribble Drive
Madison, AL 35758
256 705 5530
256 705 5538 Fax
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Bev Christian
Sent: Friday, October 19, 2001 2:01 PM
To: [log in to unmask]
Subject: [TN] tin on iron and solder on iron
OK, here is a general question for all you met guys. But I am not sure I
can explain it well enough to be understood!
We all know that tin can be put on iron or we wouldn't have "tin" cans. I
also know it is difficult to put solder on iron. So my question is this: if
one has a tinned iron surface and it is put into molten solder the tin will
be dissolved into the molten solder. I presume when the piece of iron is
withdrawn from the pot, solder will be well adhered to the iron. Is this
because there is a solderable tin/iron intermetallic? What is the main
difference between the tin can process and putting solder directly on iron
that makes one easy to do and the other difficult? This may be a "first
grade" met question, but I don't know the answer. Thanks.
Bev Christian
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