After I finished tearing our old deck down I recovered a few of the nails. The nails are about 20 years old; the picture shows what should be the same style nail in different stages of decay. They appear to be some type of (lightly) galvanized spiral shank nail. As I rebuild our deck, I hope that the newer "triple hot dipped" type connectors and fasteners hold up better - and the other "coated" screws as well.
If you are wondering about the odd looking protrusions near the head, tip, etc of the nail - I picked up the nails with a magnetic sweep and it left them mildly magnetic. The nails retained small bits of rust from the sweep which are like iron particles following the magnetic field lines.
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