I was told that the reason that the Lithium Grease works so well has to do with its conductivity. If you have a really good conductor between dissimilar metals they tend not act on each other. Batteries work because of agressive reactions between dissimilar metals, but if the metals get along there will be no reaction. The best way to describe it is that the Lithuim Grease makes the aluminum seem like Stainless steel and the SS seem like alum to each other. There is no (or very little) reaction between similar metals.

Later,
Dan