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The Influence Of Oxygen On Protective Iron Carbonate Scales Formed On Carbon Steel In CO2 Environments At Near-Neutral Ph

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High strength carbon steel tensile wires confined in the annulus of flexible pipes might experience corrosion when the annulus is flooded with water, either due to outer sheath breaches or to condensation of water molecules permeating from the bore through the inner sheath. Carbon dioxide (CO2) molecules may also permeate from the bore and reach the annulus, where it dissolves into water to form carbonic acid (H2CO3).

Product Number: 51322-17899-SG
Author: Pedro Netto da Silva, Gaute Svenningsen, Arne Dugstad, José Antônio da Cunha Ponciano Gomes
Publication Date: 2022
Industries: Cathodic Protection , Corrosion Monitoring and Control , Coatings and Linings , Coatings
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The influence of oxygen on the morphology and protectiveness of iron carbonate scales formed on carbon steel in CO2 environments at near-neutral pH was investigated. Specimens were tensioned in four-point bending jigs for stress corrosion cracking tests, and unloaded specimens were used for electrochemical tests. All specimens were exposed to CO2 aqueous solutions with and without dissolved oxygen, and corrosion rates were monitored by linear polarization resistance technique. Corrosion scales were characterized by scanning electron microscopy and X-ray diffraction, while the analysis of the corroded surface of the specimens after scale removal was carried out using scanning electron microscopy and optical profilometry. The iron carbonate scales were destabilized and became less protective in the presence of oxygen, which resulted in localized attacks, but no cracks were observed.

The influence of oxygen on the morphology and protectiveness of iron carbonate scales formed on carbon steel in CO2 environments at near-neutral pH was investigated. Specimens were tensioned in four-point bending jigs for stress corrosion cracking tests, and unloaded specimens were used for electrochemical tests. All specimens were exposed to CO2 aqueous solutions with and without dissolved oxygen, and corrosion rates were monitored by linear polarization resistance technique. Corrosion scales were characterized by scanning electron microscopy and X-ray diffraction, while the analysis of the corroded surface of the specimens after scale removal was carried out using scanning electron microscopy and optical profilometry. The iron carbonate scales were destabilized and became less protective in the presence of oxygen, which resulted in localized attacks, but no cracks were observed.

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