51313-02626-The Role of Synthetic Hydrocarbon on Corrosion Behavior of API X65 Carbon Steel in a CO2 Multiphase Flow System

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Product Number: 51313-02626-SG

ISBN: 02626 2013 CP

Author: Frederick Pessu

Publication Date: 2013

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The role of a synthetic hydrocarbon (Isopar M) on the flow-induced corrosion and erosion-corrosion behaviour of X-65 carbon steel has been investigated in CO2-saturated flow-induced corrosion and erosion-corrosion conditions. A rotating cylinder electrode (RCE) was used in conjunction with electrochemical techniques and gravimetric measurements to determine the influence of hydrocarbon at various rotation speeds. The addition of 20% Isopar M formed an oil-in-water emulsion which was found to increase the rate of anodic dissolution of carbon steel particularly at low rotation speeds. At higher flow velocities emulsion stability and competitive wetability helped to minimise the corrosive behaviour of the hydrocarbon. The synthetic hydrocarbon phase was believed to modify the metal surface making the steel surface more thermodynamically active for electrochemical corrosion reactions to occur while also reducing the impact energy from impinging sand particles under erosion-corrosion conditions. A water-in-oil emulsion was formed at a water cut of 20% which reduced degradation rates. This effect was most likely attributed to a reduction in surface wetability. Additionally degradation mechanisms are discussed through the use of scanning electron microscopy.