51314-4051-Effect of Wall Shear Stress on Sour Corrosion of Carbon Steel

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Product Number: 51314-4051-SG

ISBN: 4051 2014 CP

Author: Chong Li

Publication Date: 2014

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Carbon steel corrosion in the presence of CO2 and H2S (referred to as CO2/H2S corrosion or sour corrosion) is a concern in the oil and gas industry. Very often sour corrosion susceptibility of carbon steel is evaluated in laboratory by measuring corrosion rate under simulated field environmental conditions. One of the important conditions to be simulated is the wall shear stress which describes the interaction of the flowing fluid with the steel surface. Wall shear stress can then be used to correlate with the flow effect on corrosion in the field. Currently there is a lack of understanding on the effect of wall shear stress on sour general and localized/pitting corrosion. To gain this understanding high pressure autoclave laboratory testing has been carried out to study the effect of wall shear stress on sour corrosion of carbon steel. In this study weight loss corrosion rates were measured. Corrosion scales were characterized using scanning electron microscopy (SEM) energy dispersive spectroscopy (EDS) X-ray diffraction (XRD) and transmission electron microscopy (TEM). In addition localized/pitting corrosion was evaluated by an interferometric microscope to obtain a detailed 3D surface profile of the corrosion coupon surface after scale removal. This paper will present the experimental results and discuss the effect of wall shear stress on carbon steel sour general and localized/pitting corrosion.