I think that saying salt is acidic is not correct, and there is no need to "neutralize" it. It is not alkaline either.
Salt obviously does indeed increase rates of corrosion, but not because it is acidic, and more to do with increasing the rate electron transfer and ion transfer in the water. Since the rusting or oxidation process involves ion and electron transfer, salt increases the rate of oxidation.
I just don't want people going into their kitchen and mixing up solutions of baking soda or sodium hydroxide and spraying it on the undercarriage and thinking it will mitigate rusting.
The main ways to minimize corrosion/rust are to:
- keep things dry
- keep oxygen away
- reduce exposure to salts (this won't prevent corrosion, but will slow it down)
- reduce time exposed to water/oxygen/salt (cleaning)
If you can't do these things (clearly you can't with a car undercarriage), then coatings or non-rusting alloys may be the best option.
Cleaning and protecting is obviously important, and I think that was your main point.
Current: 2007 335i sedan
Alpine White | Sports | Premium | Cold | Comfort Access
FORMERLY: 128i coupe
Alpine White | Sports Package | Black Leather