There have been a couple of corrosion tests posted on the internet on various lubricants. Here is one that came up on a Goggle search; there was another a few years ago using steel plates (not nails as this one) and showed CLP Breakfree was superior. Also, on one of the Gunsmithing Videos, they state that Breakfree forms a molecular bond to the metal which prevents corrosion.
http://www.thegunzone.com/rust.html