OH! Who was asking about the corrosive properties of Coca-Cola?
I remember an "experiment" we did in fourth grade science class...
Just fill a glass with Coca-Cola.
Get a galvanized nail from the tool shed, tool room, tool box, wherever...
Place nail in glass of Coca-Cola.
Leave overnight.
Come morning... Well, when I saw what happened to the nail it didn't really stop me from drinking Coca-Cola, but it sure was neat!
As for the effect on our stomach linings... I also seem to remember at the time hearing that our stomach actually contains even more corrosive compounds than Coca-Cola - including something very similar to hydro-chloric acid. So, the cola may not be the most nutritious thing to put in your body, but your stomach lining should be fine.