I would say that this type of corrosion failure would depend on the weather and road conditions in your area. I remember reading a post a while back (I think by Greywolf), warning of the chemical reaction between aluminium and steel, when it comes to looking for an earth connection point on the frame.
Perhaps if you made it part of your routine / service, to check this earth connection, say once a year, looking for any corrosion on both the earth bolt and terminals, you should be good to go.