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51315-5584-The Influence of pH on Localized Corrosion Behavior of X65 Carbon Steel in CO?-saturated Brines

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Product Number: 51315-5584-SG
ISBN: 5584 2015 CP
Author: Frederick Pessu
Publication Date: 2015
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Pitting and localized corrosion of carbon steel is considered to be quite complex and can be influenced by a wide range of process parameters; temperature in-situ pH chlorides ion concentration etc. Solution pH is known to influence corrosion film characteristics and morphology in CO2 and H2S-containing systems. However from the perspective of pit initiation and propagation in CO2-saturated environments the extent to which in-situ pH of solutions and the presence of corrosion products influence localised attack is still not clearly understood. As part of an ongoing parametric study into pit initiation and propagation in CO2 and H2S environment this paper presents an investigation into the effect in-situ pH on the corrosion product characteristic and the pitting behaviour over a wide range of environment acidity. Pit propagation studies are conducted over 168 hours at 50°C in 3.5 wt% NaCl buffered solutions to identify the role pH plays on corrosion product film morphology and chemistry and the underlying influence this has on the propagation of pits within each environment. Corrosion film composition and morphology are identified through a combination of electrochemical and surface analysis techniques which include scanning electron microscopy (SEM) transmission electron microscopy (TEM) energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The extent of corrosion damage of the carbon steel is evaluated through the implementation of surface interferometry to study discrete pit geometry; namely the size and depth.KEY WORDS: Carbon dioxide corrosion corrosion products uniform corrosion pitting.
Pitting and localized corrosion of carbon steel is considered to be quite complex and can be influenced by a wide range of process parameters; temperature in-situ pH chlorides ion concentration etc. Solution pH is known to influence corrosion film characteristics and morphology in CO2 and H2S-containing systems. However from the perspective of pit initiation and propagation in CO2-saturated environments the extent to which in-situ pH of solutions and the presence of corrosion products influence localised attack is still not clearly understood. As part of an ongoing parametric study into pit initiation and propagation in CO2 and H2S environment this paper presents an investigation into the effect in-situ pH on the corrosion product characteristic and the pitting behaviour over a wide range of environment acidity. Pit propagation studies are conducted over 168 hours at 50°C in 3.5 wt% NaCl buffered solutions to identify the role pH plays on corrosion product film morphology and chemistry and the underlying influence this has on the propagation of pits within each environment. Corrosion film composition and morphology are identified through a combination of electrochemical and surface analysis techniques which include scanning electron microscopy (SEM) transmission electron microscopy (TEM) energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The extent of corrosion damage of the carbon steel is evaluated through the implementation of surface interferometry to study discrete pit geometry; namely the size and depth.KEY WORDS: Carbon dioxide corrosion corrosion products uniform corrosion pitting.
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