The aim of this work is to report the results of a study on plain stee
l exposed for four weeks to acidic fogs. These included two levels of
NO3-, both alone and in combination with SO42-, at 35 degrees C and 90
% RH. Gravimetric analysis, XRD, FTIR and polarized light microscopica
l examinations were used to follow the corrosion effects and the rust
trasformations. As a major conclusion, it was found that atmospheric N
Ox deposited by fogs had no important effect.