How does vehicle corrosion occur?
Vehicles driven on roads treated with deicers and dust suppressants, as well as coastal areas are all exposed to salts. These salts attract moisture from the air and are then dissolved. The dissolved salts increase water conductivity, making an electrolyte solution. Much in the same way an electrolyte in a battery facilitates the movement of electrons from one electrode to another, immersing any metal in an electrolyte solution speeds up the movement of electrons and the process of corrosion.
Humid conditions such as parking a car in a warm garage after driving through treated roads or natural climate conditions create optimal conditions for corrosion to occur. Repeated exposure to salt will accelerate corrosion on compromised vehicle surfaces (existing rust spots and imperfections in the clear coat).