Abstract
AbstractThe effect of oxygen on the CO2 corrosion of carbon steel wires in simulated annulus environments of flexible pipes was investigated. Wire specimens were exposed to modified artificial seawater solutions with and without dissolved oxygen. Dissolved corrosion products (Fe2+ and bicarbonate/carbonate) were added to the test solution to simulate corrosion in the annulus environment. Linear polarisation resistance technique was used to monitor the corrosion rates of specimens. The morphology of corrosion scales was investigated by scanning electron microscopy (SEM), and the crystalline phases were determined by X‐ray diffraction. Surface analysis of corroded specimens was carried out by means of SEM and optical profilometry. Different corrosion morphologies were observed, influenced by the different corrosion scales formed throughout the sequence of environmental conditions imposed on the material.
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