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Title: Understanding the interactions between corrosion scales and inhibitor films in flow conditions
Author: Akbar , Abdulmuhsen
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2013
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A sweet corrosion environment is known as one which contains carbon dioxide. 12.5% of failures in the oil and gas industry are associated with this environment and the corrosion in it. In some engineering applications and under certain conditions, corrosion layers, such as iron carbonate are produced on material surfaces in which they form a diffusion and physical barrier between the carbon steel surface and the environment and hence protect the carbon steel from further corrosion. Additionally, corrosion inhibitors are used to prevent or decrease material degradation as a result of corrosion for carbon steel. The aim of this study is to assess the conditions required to form iron carbonate layers and the nature of these layers on the surface of X65 carbon steel. The erosion-corrosion resistance of the surface covered with the iron carbonate film in inhibited systems is investigated to assess the interactions between the iron carbonate film and the inhibitor film using both the Rotating Cylinder Electrode (RCE) and the Submerged Impingement Jet (SIJ). It was found that 1% NaCI with pH 7 and ferrous ion concentration of 250 ppm sufficient to produce a FeC03 protective film on the surface ofX65 carbon steel. This was proven using optical microscopy, Scanning Electron Microscope (SEM), Focused Ion Beam SEM (FIBSEM), Energy Dispersive X-Ray (EDX) analysis and Fourier Transform Infrared Spectroscopy (FTIR) analysis. Multi Scale (7.1) software was used to assess the supersaturation conditions in the brine. In addition, material damage of as-received X65 was found to reduce when the inhibitor was used in both RCE and SIJ systems as expected. However, the inhibitor was found to be insufficient to reduce the material degradation of pre- scaled X65 using RCE, whereas this damage of the pee-scaled X65 was decreased using SU. The results are related to the current literature and suggested damage mechanisms are discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available