Understanding Pitting Corrosion Behaviour of X-65 (UNS K03014) Carbon Steel in CO2 Saturated Environments: The Temperature Effect

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Product Number: 51314-4214-SG

ISBN: 4214 2014 CP

Author: Frederick Pessu

Publication Date: 2014

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Frederick Pessu Richard Barker and Anne NevilleInstitute of Engineering Thermofluids Surfaces and Interface (iETSI)School of Mechanical Engineering University of LeedsLeeds LS2 9JT UKCarbon dioxide (CO2) related pitting and localized corrosion failures are of primary concern within the oil and gas industry. In environments saturated with both CO2 and H2S gas the mechanisms by which pitting of carbon steel occurs can be complex and at times unpredictable. The film formation characteristics and morphology in either CO2 and/or H2S containing systems significantly influences the localized/pitting corrosion behaviour of exposed carbon steel materials. This paper presents the first part of a parametric study on pitting corrosion of carbon steel in H2S-CO2 saturated brines. This work examines the impact of changes in a key environmental parameter; temperature on pitting initiation and propagation processes of carbon steel in CO2 saturated NaCl brines. A pit propagation study is conducted over a long duration based on changes in secondary environmental parameters and the implications of such changes on the film properties and morphology are studied through a combination of electrochemical and surface analysis techniques (SEM and XRD). The possible galvanic effects of changes in film morphology and the influence of exposure time on pit initiation and propagation are considered in an effort to elucidate the role of film morphology on pitting corrosion. 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.