Study on the Flow Corrosion Behavior of L360 Steel in Simulated Formation Water

Abstract

 In order to study the corrosion behavior of L360 steel at the pipe wall of water-containing gathering and transportation pipelines under real flow conditions， a self-made cyclic flow corrosion test device was used.The electrochemical impedance spectroscopy and potentiodynamic scanning methods were used to analyze the corrosion electrochemical characteristics of L360 steel.The scanning electron microscope and three-dimensional optical microscope were used to analyze the corrosion micromorphology.Results showed that the average corrosion rate of the test piece increased with the increase of flow rate，and the local corrosion rate presented a trend of first decreasing and then increasing.Properly increasing the flow rate could slow down the local corrosion rate.After the loop was run for 4 h， a relatively complete corrosion product film began to form on the surface of the sample.When the flow rate reached 0.5 m/s， the corrosion product film on the pipe wall began to detach.For clean and smooth samples， the initial stage of corrosion belonged to extremely severe corrosion.

Keywords

• flow； pipe wall； l360 steel； corrosion behavior； corrosion product film； pitting corrosion