Back to topic: I couldn't muster that kind of enthusiam for a rusty bike unless it was very, very special. And did you consider the effect of galvanic corrosion when bolting together steel and aluminum? Put those two metals together, add salt water, and the aluminum will wither away while protecting the steel.
Ships actively use this to protect the hull etc. by placing (and frequently replacing) a lump of Zn below the waterline