It doesn't corrode anything, IMO. If it did, we wouldn't use it to spray our car windows and have it drift back over the car roof, (at least I wouldn't /forums/images/graemlins/wink.gif). If it corroded, it would have been history a long time ago, the way I figure it.
Also, if the tire is filled, the fluid is over the rim (recommended with calcium chloride anyway) thus leaving the rim in the solution and not exposed to the air (oxygen).
This make any sense?