Validation of a self-developed corrosion model for the prediction of atmospheric corrosion of mild steel in Sri Lanka

Abstract

Among the different types of corrosion failures, Atmospheric corrosion accounts for many failures. The corrosivity of atmosphere mainly depends on the atmospheric variables such as relative humidity, temperature, salinity etc. Development of a relationship between corrosivity and environmental variables which is known as Corrosion modeling is widely used method for the determination of corrosivity of atmosphere. For the prediction of atmospheric corrosion a corrosion model was developed and the model was calibrated by the data obtained from field exposure test that was conducted for two years in four different places in Sri Lnaka. For the validation of model’s forecasting capability, the exposure test carried out for the calibration of model in two locations were continued up to five years and two exposure tests were conducted in another two different locations. According to the Test results the model shows good forecasting capability in the areas that are not more closure to coastal line. This paper describes the work carried out to validate the model for forecasting and prediction capability.