Simulation of atmospheric corrosion using mathematical model

Igarashi, Takahiro  ; Komatsu, Atsushi ; Kato, Chiaki   ; Sakairi, Masatoshi*

From the viewpoint of environmental and energy problems, research on atmospheric corrosion of steel materials is one of the important themes. In this study, we focused on the liquid film thickness, which is one of the environmental factors greatly related to the amount of corrosion, and constructed and simulated a corrosion prediction model using the amount of adsorbed salt and relative humidity as parameters. The developed model made it possible to express changes in corrosion rate due to changes in relative humidity day and night. In addition, there were times when the corrosion rate changed drastically during the day. Analysis of the simulation data suggested that this might be a change in the liquid film thickness due to the deliquescent of the contained salt.