A novel method to determine flow‐accelerated corrosion rate based on fluid structure interaction

Abstract

In this paper, the mechanism of flow‐accelerated corrosion (FAC) and FAC rate prediction model are investigated. A modified MIT model is obtained by illustrating the relationship between CPF thickness and porosity with CPF stress based on fluid structure interaction (FSI) numerical simulation. The results reveal that the effect of fluid on CPF strength gradually increased with increasing of velocity, thereby increasing Tresca stress and deformation. CPF thickness gradually decreased with increasing stress and decreasing pH. CPF porosity gradually increased with increasing Tresca stress; however, porosity change became smaller when stress reached a certain value. CPF porosity is gradually reduced with increasing temperature. Finally, FAC rate is proportional to Tresca stress and temperature and is inversely proportional to pH. The calculation results of the modified MIT model agree with the experimental results.

Effects of fluid dynamics parameters on flow-accelerated corrosion at elbow of carbon steel pipeline

“…Zhang et al [22] studied FAC at the elbow of carbon steel using an array electrode and computational fluid dynamics simulation, finding that the maximum FAC rate appears at the innermost side. Zhu et al [23] developed a novel method that combined the steady-state mass transfer model of electrochemical theory and a one-dimensional galvanic corrosion model to predict the FAC rate in elbows, with results consistent with the actual operating results of the power plant. However, previous studies have primarily focused on the relationship between turbulent parameters obtained through CFD simulation and the wall thinning values obtained from actual ultrasonic testing (UT) measurements [24,25].…”