I would think the emblems are put on at the factory.
The emblems are plastic, but the chrome coating is metal. So the chrome coating could be rusting.
I think what norinn's dealer was getting at was the rail dust actually may have penetrated the paint. The little shards of metal may have poked little holes through the paint. That would be enough to expose the body to allow oxidation (rusting) to occur.
On the upside Heather, if it is rust you could make the dealer repaint your car (with good paint this time). Do not allow them to sell you on a cathodic protection system, make them repaint the car.[boxing]
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