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51315-5562-Localized Corrosion of Corrosion-resistant Alloys in Environments Containing Hydrogen Sulfide

Picture for Localized Corrosion of Corrosion-resistant Alloys in Environments Containing Hydrogen Sulfide
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Product Number: 51315-5562-SG
ISBN: 5562 2015 CP
Author: Andrzej Anderko
Publication Date: 2015
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A modeling framework has been developed for rationalizing and predicting localized corrosion and stress corrosion cracking of corrosion-resistant alloys in environments that contain hydrogen sulfide and chlorides. This framework has been applied to five alloys that are widely used in oil and gas production i.e. a supermartensitic stainless steel (S13Cr) a duplex alloy (2507) and three austenitic alloys (2535 28 and 29). The model relies on the computation of the repassivation potential and corrosion potential as a function of the composition of the aqueous environment temperature and pressure. As the repassivation potential defines the threshold condition for the existence of stable pits or crevice corrosion an alloy is susceptible to localized corrosion if the corrosion potential exceeds the repassivation potential. To calculate the repassivation potential a previously developed mechanistic model has been extended to include the effects of alloy composition. The model accounts for competitive adsorption at the interface between the metal and the occluded site environment the effect of adsorbed species on anodic dissolution and the formation of both oxide and sulfide solid phases in the process of repassivation. To calculate the corrosion potential a mixed potential model has been developed that takes into account various anodic and cathodic processes on passive alloy surfaces. The model has been parameterized on the basis of measurements of repassivation and corrosion potentials at temperatures ranging from 358 K to 505 K and in wide ranges of chloride concentrations and H2S partial pressures. H2S often leads to an increase in the propensity for localized corrosion as exemplified by a decrease in the repassivation potential. However exceptions exist at low dissolved H2S and Cl concentrations at which inhibition of localized corrosion may be observed. The model accurately represents the experimental data and elucidates the interplay of the effects of Cl H2S and temperature on localized corrosion.

A modeling framework has been developed for rationalizing and predicting localized corrosion and stress corrosion cracking of corrosion-resistant alloys in environments that contain hydrogen sulfide and chlorides. This framework has been applied to five alloys that are widely used in oil and gas production i.e. a supermartensitic stainless steel (S13Cr) a duplex alloy (2507) and three austenitic alloys (2535 28 and 29). The model relies on the computation of the repassivation potential and corrosion potential as a function of the composition of the aqueous environment temperature and pressure. As the repassivation potential defines the threshold condition for the existence of stable pits or crevice corrosion an alloy is susceptible to localized corrosion if the corrosion potential exceeds the repassivation potential. To calculate the repassivation potential a previously developed mechanistic model has been extended to include the effects of alloy composition. The model accounts for competitive adsorption at the interface between the metal and the occluded site environment the effect of adsorbed species on anodic dissolution and the formation of both oxide and sulfide solid phases in the process of repassivation. To calculate the corrosion potential a mixed potential model has been developed that takes into account various anodic and cathodic processes on passive alloy surfaces. The model has been parameterized on the basis of measurements of repassivation and corrosion potentials at temperatures ranging from 358 K to 505 K and in wide ranges of chloride concentrations and H2S partial pressures. H2S often leads to an increase in the propensity for localized corrosion as exemplified by a decrease in the repassivation potential. However exceptions exist at low dissolved H2S and Cl concentrations at which inhibition of localized corrosion may be observed. The model accurately represents the experimental data and elucidates the interplay of the effects of Cl H2S and temperature on localized corrosion.

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51316-7708-Localized Corrosion of Corrosion-Resistant Alloys in Oil and Gas Production Environments: II. Corrosion Potential

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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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51314-3744-Modeling Localized Corrosion of Corrosion-Resistant Alloys in Oil and Gas Production Environments

Product Number: 51314-3744-SG
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