When I was growing up in the Houston area, we spent every moment we could get away at the beach. I remember one summer, probably 69 or 70, at a surfing/bonfire spot called Quintana near Freeport someone had drug several pieces of automotive junk down to a spot at a dead end road and abandoned them against a dune. There was a Ford and a Toyota truck ( HiLux?) that had been in a head on accident. We watched those crumpled up vehicles rust completely to pieces over the next few years. The Toyota won by a landslide.
If they had sat in a field in Southern Wyoming for those same fifty years, they would still be sitting there today with salveagable parts.
I've stopped bringing up neat things we find in the ocean made of iron. The last one was a 300 lb. Admiralty anchor from sometimes around 1800. (
http://2gringos.blogspot.com/2007/12/old-anchor.html ) It made it intact for over 200 years on the bottom of the ocean. I put it next to a driveway, washed it down with phosphoric acid, got it rust free, and encapsulated it with another rust compound, and it won't make ten years in the air. Now, if we find something interesting on an old shipwreck site, we just mark it with a GPS and leave it in place.
The effects of adding sodium chloride to a vehicle are pretty well demonstrated in any beach community if you pay attention to the rusted out fenderwells and bumpers.
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