Originally Posted by WNYTACOMA
I don't have a current source, but it has been pretty well documented over the previous maybe 5 years or so....
Documented? or urban myth passed around so much people actually start to believe it? Without sources it's hard to know which it is.
Sodium chloride is sodium chloride, it's a corrosive as ever. There are other salts (mainly calcium chloride and potassium chloride, but also magnesium as someone else noted) they could use but their cost is much higher and are still corrosive; but not MORE so!
I think some places (but not everywhere) use a kind of molasses in the salt mix that makes the salt 'stick' longer on the roads. It can also makes it 'stick' longer under your vehicle. But thing is: it's no more corrosive than sodium chloride can make it. The way to reduce the contact time, and therefore the severity of corrosive effect, is the same as it ever was: give the undercarriage a really good wash after each and every snow event.