Re: Rusty Alfas?
in line with what the others have said; your mate is talking absolute bollax. modern cars from established manufacturers simply don't rust any more as they once did. All automotive steels are at least single galvanised and most is now double galvanised (coated with zinc on both sides). Once the shell is constructed with all spot welds complete the entire shell is phosphate passivated.
This is a common and standard industry practice for virtually all auto manufacturers, certainly in Europe.
I don't even think you can buy automotive steel roll-stock that isn't at least single galv any more, even as a special order.
ALL the manufacturers buy from the same steel mills. The quality of steels used today in vehicle body construction are pretty much uniform accross manufacturers and this is driven more to meeting NCAP crash performance than corrosion protection.
Mercedes offer a 30yr corrosion guarantee, but they do so with steel coming from a mill that also supplies Ford, Opel and others.
The point I'm making is that Alfa is in-line with industry standards.
So, worry about fuel consumption, rattles, squeaks, notchy gearchanges, tyre wear, engine hesitation, fogged-up lamp clusters etc. etc. but you can pretty much forget about corrosion.