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Augmentation Of Iron Carbonate Corrosion Products Using Amino Acids In CO2 Corrosion Environments

Picture for Augmentation Of Iron Carbonate Corrosion Products Using Amino Acids In CO2 Corrosion Environments
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Oil and gas production in a CO2 saturated environment is known to lead to corrosion due to dissolved carbonic acid. However, when the conditions are favorable, a protective FeCO3 layer can also form which reduces the material degradation of the underlying steel by up to ten or a hundred times.1 The formation of FeCO3 is possible via the reaction shown in equation 1.

Product Number: 51322-17754-SG
Author: Dilshad Shaikhah, Wassim Taleb, Bruce Cowe, Maalek Mohamed-Said, Anne Neville, Richard Barker
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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Iron carbonate (FeCO3) is a carbon dioxide (CO2) corrosion by-product known to provide corrosion resistance to carbon steel in specific environmental conditions. Nonetheless, it suffers from both chemical dissolution and mechanical damage when the pH is low and when subjected to particle impingement, respectively. This work aims at understanding whether incorporating two amino acids, mainly cysteine and glycine help improve either the reduction in corrosion rate or the mechanical properties of FeCO3. In addition to their corrosion inhibition properties, it is anticipated that incorporating such organic moieties directly into the FeCO3 layer as it grows should have a positive effect on properties such as the modulus, in turn making the layer less prone to internal stresses and disbandment. Our results show that both amino acids incorporate within the FeCO3 matrix and affect the hardness and modulus of the hybrid layer. Moreover, cysteine is able to reduce localized corrosion attack in such environments.

Iron carbonate (FeCO3) is a carbon dioxide (CO2) corrosion by-product known to provide corrosion resistance to carbon steel in specific environmental conditions. Nonetheless, it suffers from both chemical dissolution and mechanical damage when the pH is low and when subjected to particle impingement, respectively. This work aims at understanding whether incorporating two amino acids, mainly cysteine and glycine help improve either the reduction in corrosion rate or the mechanical properties of FeCO3. In addition to their corrosion inhibition properties, it is anticipated that incorporating such organic moieties directly into the FeCO3 layer as it grows should have a positive effect on properties such as the modulus, in turn making the layer less prone to internal stresses and disbandment. Our results show that both amino acids incorporate within the FeCO3 matrix and affect the hardness and modulus of the hybrid layer. Moreover, cysteine is able to reduce localized corrosion attack in such environments.

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