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Effect of corrosion products evolution/transformation on the localised/pitting corrosion behaviour of carbon steel in sour environment

Picture for Effect of corrosion products evolution/transformation on the localised/pitting corrosion behaviour of carbon steel in sour environment
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Carbon steel remain the most commonly used material in most oilfield applications. The susceptibility of carbon steel to various forms of corrosion is one of the major drawbacks to its remarkable economic and metallurgical advantages. Localized and/or pitting corrosion carbon steel used in oilfields is one aspect of its limitation that is very common and yet most unpredictable and difficult to mitigate against. The nature of the environment is also a key contributor to the evolution of localized and/or pitting corrosion especially in complex oilfield environment containing both H2S CO2 and other acid gases. The presence of H2S in a corrosion environment often introduces some complexities to the localized and/or pitting corrosion behaviour of exposed carbon steel materials. As a protection against uniform corrosion iron sulphide has been shown to form and has received much attention in the scientific literature. The evolution of iron sulphides (stoichiometric and non-stoichiometric) during the corrosion process of carbon steel is still not fully understood. This makes the already difficult challenge of predicting pitting/localized corrosion of carbon steel more complex and challenging especially since the electronic (and so conducting properties of iron sulphides) can mean that anodic/cathodic reactions can be supported on what are corrosion products or deposits on the corroding surface. This work focuses on understanding FeS formation evolution; dissolution and/or transformation using a combination of different electrochemical responses such as Linear and Tafel Polarization combined with post-experiment surface analysis such as XRD and SEM. It builds on and complements the large literature in this area. The study is carried out in 3.5 wt. % NaCl solution saturated with two different sour corrosion systems; H2S-CO2 and H2S-N2 at 80°C and for up to 21 days. The relationship between the processes of FeS formation evolution; dissolution and/or transformation and the evolution of localized and/pitting corrosion is also established. Pitting and/localized corrosion characterization is achieved using 3D surface profilometry which allows characterisation of discrete pit parameters such as depth diameter etc.

Product Number: 51319-12943-SG
Author: Frederick Pessu
Publication Date: 2019
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Picture for 10278 A Parametric Study of Sour Corrosion of Carbon Steel
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10278 A Parametric Study of Sour Corrosion of Carbon Steel

Product Number: 51300-10278-SG
ISBN: 10278 2010 CP
Author: Wei Sun, Dylan V. Pugh, Stephen N. Smith, Shiun Ling, Jorge L. Pacheco and Robert J. Franco
Publication Date: 2010
$20.00

A parametric study of sour corrosion was conducted and is presented in this paper to provide a better understanding of corrosion in sour gas environments. Various parameters that are known to affect the corrosion rate were evaluated and their impacts on corrosion rate are discussed.

 
Picture for Effect of Iron Sulfide Deposits on Sour Corrosion of Carbon Steel
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51316-7313-Effect of Iron Sulfide Deposits on Sour Corrosion of Carbon Steel

Product Number: 51316-7313-SG
ISBN: 7313 2016 CP
Author: Jon Kvarekval
Publication Date: 2016
$20.00

The corrosive effects of iron monosulfide deposited on carbon steel surfaces were investigated in  autoclave experiments. The H2S and CO2 partial pressures were 1 to 20 bar.  Temperatures were 10-120 °C. The test solutions consisted of high-salinity brine and low-salinity condensed water. Typical duration was 14 days. Weight loss and localized corrosion data were obtained.
Picture for Effect of Carbon Dioxide and Hydrogen Sulfide on the Localized Corrosion Susceptibility of Corrosion
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Effect of Carbon Dioxide and Hydrogen Sulfide on the Localized Corrosion Susceptibility of Corrosion

Product Number: 51317--8933-SG
ISBN: 8933 2017 CP
Author: Teresa Perez
Publication Date: 2017
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The purpose of this review is to discuss environmental effects, especially hydrogen sulfide and carbon dioxide on pitting susceptibility of low alloy steels and corrosion resistant alloys.
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