Circuits Assembly, December 1st, 2007
Solder is a metal alloy comprised of several metals. The main metal content is tin. Because tin is not a noble metal, it will oxidize when exposed to air. The rate and nature of this oxidation depends on temperature and exposure time. Normally, tin has a closed oxide layer that has about the same volume as the underlying metal. That means the oxide layer will normally protect the underlying metal from further oxidation. This behavior will change, however, when the solder becomes molten and begins to be pumped.
In a running machine, the static oxide layer mixes with air because of the turbul...
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