Fiat group (Fiat/Alfa/Lancia) were actually screwed over there. They bought steel off the Russians (made a deal with them for the fiat 124 or 125 iirc plans/presses which became the lada). First batch of steel was perfect, flaw free. When deal was done the Russians smelted all the left over white goods and s**t from the war and sent that over to complete the deal. This is why they literally rusted from the inside out.
Hurt them bad, pulled lancia from the UK market and as you say made sure their cars were rust proof from then out to save their rep.
Renault are different. They seem to cut corners on R&D, and they seem to avoid longevity in their cars. Almost to the point of engineering to fail. I still maintain to this day, the Clio is a s**t car. However its a s**t car that does some things extraordinarily well, which is why I love it. Its like having a really annoying arse of a girlfriend that's AMAZING in bed. You want to bin her off because your head pain is too much to handle, but every time you jump into bed with her you forget about that.