According to the link above it looks like it will corrode. The aluminum isn't very noble, which means it will corrode. Even though the stainless is noble it looks like the large amount of aluminum on a small amount of stainless will cause the stainless to corrode.
However, it won't be in contact with a contact with fluid very often. Maybe that means it won't corrode our corrode as fast? Maybe someone else can confirm that?
Maybe it would be best to connect them with an insulator and not worry about it.