Having ridden Steel, Ti, Alu and Carbon bikes, I think we, maybe, pay too much attention to frame materials.
I've had steel bikes corrode quite nastily - but they were already old, second hand to me and not necessarily that well treated.
My abused, ~30 year old straight gauge chromoly garage-stored hybrid is showing no signs of corrosion yet. And in the last ten years, I'm sorry to say, I've only properly cleaned it once.