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withdrawn from the pot, solder will be well adhered to the iron.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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