All true. Chloride anions (not onions) will corrode and pit aluminum over a period of time, albeit longer than exposed steel, but it will still occur. If you drive on roads that use that nasty liquid spray on the winter roads like they do in Alberta, the corrosion will happen faster but it it more aesthetics than anything and other than maybe your wheels, few people see the underside of your Corvette. I don't drive my Vette in the winter just because it's my choice and not trusting other so called drivers that I see sliding through intersections on a regular basis. If I did and was concerned about minor corrosion and had unlimited disposable income, powder coating your exposed aluminum chassis will protect it.