Effect of Turbulent Flow on Corrosion Behavior of 6.5Cr Steel in CO2-Containing Environment

Abstract

The effect of turbulent flow on the corrosion behavior of 6.5Cr steel in CO2-saturated oil field formation water was examined using a rotating cylinder electrode. Electrochemical measurements demonstrated that increasing the flow rate could decrease the corrosion rate of 6.5Cr steel. When the rotation rate of the rotating cylinder electrode reached 2000 rpm, 6.5Cr steel could be passivated. Surface characterization and ion analysis results showed that increasing flow rate reduced Fe2+ concentration in the solution near the steel surface, inhibited FeCO3 deposition, and then increased Cr(OH)3 concentration in a corrosion film.