There is a new book on the subject, RUST. The author talks of boats, cars, the Statue of Liberty, and aluminum soda cans. One of the fun facts mentioned is that before the modern undercoatings, a car in the northern U.S. that was subjected to road salt lost about 10 pounds of weight a year.
Jay at Marooned has a car pr0n post today that reminded me of the book.
Makes you think about what all that road salt is doing to the highway bridges, doesn't it?