2017 Volume 66 Issue 2 Pages 58-61
Atmospheric corrosion is an electrochemical process which can only proceed in the presence of an electrolyte film. Rain is one of the main factors in initiating the time of wetness and transporting the chemical substance from the atmosphere to metal surface that guide to accelerate the corrosion attack. In this case study, an artificial rainfall equipment was developed with the aim of defining the behaviors of atmospheric corrosion which is affected by rain and chemical species. The Atmospheric Corrosion Monitoring （ACM） sensor which consists of a Fe-Ag couple was used to measure the corrosivity of the rainfall solution by finding the relation between the Corrosion Rate （CR） and the sensor output. The controllable precipitation rate and its distribution facilitate in investigating the effect of rainfall on the corrosion behaviors. The relation between the sensors output and CR enable to predict the corrosivity of the atmosphere. Thus, the developed artificial rainfall equipment is an essential and reliable tool for studying the corrosion behaviors under the effect of rain.
