Monitoring and modeling studies of Cl– concentration in an atmospheric corrosion environment: An application to the no. 6 naphtha cracking complex

Abstract

The No. 6 Naphtha Cracking Complex was built on man‐made new land, which was itself filled by dredging sand from the sea. The local atmospheric environment is high in sodium chloride and humidity. Therefore, it is important to investigate and document background information about the atmospheric corrosion environment in the complex. From the results of only four sites of sampling and analyzing, the Cl– concentrations in the air, in fall and winter, were higher than those in spring and summer; and the Cl– concentrations in the air decreased from the upwind coastal zones to the downwind hinterland regions. In order to save the great expense of sampling and analyzing, a model was developed and utilized to predict the Cl– concentrations in the air at different locations and times. The regression analysis of the Cl– concentrations in air between actual measurement and prediction indicated a good fit. Therefore, the model may be applied to other, similar, corrosion environments and the predicted results can be used as references for future prevention strategies about atmospheric corrosion.