ABSTRACT
Electrical equipment installed at industrial or commercial facilities exposes to both indoor and outdoor environment. Composed of different kinds of materials, both metals and insulators, electrical equipment are subjected to deteriorating corrosion processes, the rate of which strongly depends on the presence of various gases, vapors, and particles and combinations there of in the surrounding air. Corrosive atmospheres are usually classified into four basic types, although most environments are mixed without any clear borderlines. The four types are: indoor, rural, marine, and industrial, where “indoor” may be considered as the mildest environment. Atmospheric corrosion is accelerated by several environmental factors, such as elevated relative humidity RH, high temperatures, presence of particulate matter and aerosols, corrosive gases. The behavior of aerosol particles in outdoor atmospheres depends on their formation, movement, and capture. The concentration of the particles depends on a multitude of factors including location, time of day or year, atmospheric conditions, presence of local sources, altitude, and wind velocity.
