Temperature, relative humidity, and atmospheric pollutants are mainly responsible for atmospheric corrosion.1 Airborne salt and high humidity are responsible for the high atmospheric corrosion under marine conditions. Although the amount of airborne salt varies with the type of day, distance from waterfront, wind direction, etc., the salt content is high enough to cause harmful corrosion under marine conditions where moisture content in the air is high. At high humidity, condensation can occur on a metal surface and this condensate makes a suitable electrolyte for formation of corrosion cells if the metal has already collected airborne salts.
The corrosivity of the atmosphere can be estimated by using a dissimilar metal probe and measuring the galvanic current. In this study, a steel/copper probe with a microammeter was used. The airborne salt can be collected on a clean and washed perspex surface, extracted with distilled water and estimated. In this study, an...
