Near surface pH measurements in aqueous CO2 corrosion

Motte, Rehan De; Mingant, Rémy; Kittel, Jean; Ropital, F.; Combrade, P.; Necib, Sophia; Deydier, Valérie; Crusset, Didier

doi:10.1016/j.electacta.2018.09.117

Cited by 26 publications

(14 citation statements)

References 18 publications

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“…In the dissolved CO2 regime, it is well known [6][7][8] that these scales are composed of densely packed siderite (FeCO3) crystallites (Fig. 1), but further details of these building blocks are scarce, despite being observed widely in the recent literature [8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Corrosion Protection through Naturally Occurring Films: New Insights from Iron Carbonate

Ahmad

Chang

Al-Kindi

et al. 2019

ACS Appl. Mater. Interfaces

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Despite intensive study over many years, the chemistry and physics of the atomic level mechanisms that govern corrosion are not fully understood. In particular, the occurrence and severity of highly localised metal degradation cannot currently be predicted and often cannot be rationalised in failure analysis. We report a first principles model of the nature of protective iron carbonate films coupled with a detailed chemical and physical characterisation of such a film in a carefully controlled environment. The fundamental building blocks of the protective film, siderite (FeCO3) crystallites, are found to be very sensitive to the growth environment. In iron-rich conditions, cylindrical crystallites form that are highly likely to be more susceptible to chemical attack and dissolution than the rhombohedral crystallites formed in iron-poor conditions. This suggests that local degradation of metal surfaces is influenced by structures that form during early growth and provides new avenues for the prevention, detection and mitigation of carbon steel corrosion.

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Section: Introductionmentioning

confidence: 99%

Corrosion Protection through Naturally Occurring Films: New Insights from Iron Carbonate

Ahmad

Chang

Al-Kindi

et al. 2019

ACS Appl. Mater. Interfaces

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“…2). Based on other CO 2 corrosion studies we estimated the pH to be one unit higher than the bulk pH: 5.8 at 80°C, 6.3 at 160°C, and 7 at 240°C, respectively [37,38]. The temperature-pH couple is indicated by a red asterisk in each of the plots.…”

Section: Thermodynamic Analysis Of Carbon Steel Corrosionmentioning

confidence: 99%

Kinetic and thermodynamic analysis of high-temperature CO2 corrosion of carbon steel in simulated geothermal NaCl fluids

et al. 2020

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We discuss kinetic and thermodynamic aspects of carbon steel corrosion in CO 2 -containing NaCl fluids up to 240°C. Crystalline nm-thick Fe-oxide films only form at 160°C and 240°C providing instantaneous and moderate corrosion protection. The absence of Fe-oxide at 80°C results in high initial corrosion rates until a moderately protective, but thick and porous, FeCO 3 film forms. From the metal/film interface it grows inwards by replacing ferrite with FeCO 3 . TEM reveals a precursory, likely hydrated and chloride-containing, phase that predates FeCO 3 formation. Thermodynamic predictions agree well with experimental results in that Fe-oxide formation is favored over FeCO 3 towards higher temperatures.

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“…Therefore, CO 2 corrosion of pipeline steel is an inevitable problem in the petrochemical industry. Although alloy steel could be used instead of pipeline carbon steel to increase its service life, pipeline carbon steel is still the most used material pipelines in the oil and gas industry considering economic, production and cost-effectiveness (Sk et al , 2017; Almeida et al , 2017; Motte et al , 2018). To take corresponding measures to further reduce the loss caused by CO 2 corrosion, the domestic and foreign corrosion researchers have conducted a lot of research studies on the corrosion behavior of pipeline carbon steel under CO 2 condition.…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic transformation at initial corrosion stage of 20# steel in aqueous solution under gas–liquid two-phase stratified flow condition

Yang

Pan

Zhang

et al. 2021

ACMM

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Purpose This study aims to investigate the initial corrosion behavior in aqueous solution of 20# seamless steel under (CO2/aqueous solution) gas–liquid two-phase stratified flow conditions. Design/methodology/approach The initial corrosion behavior was studied through the weight loss methods, scanning electron microscopy with energy-dispersive x-ray spectroscopy and x-ray diffraction. Findings The corrosion rate of 20# steel obviously increases with the increasing gas pressure at different corrosion time when the CO2 pressure is less than 0.11 MPa, and the increase of corrosion rate tends to be steady when the pressure exceeds 0.11 MPa. With the increase of CO2 pressure, the corrosion products changed from flocculent to acicular, granular and scaly. A four-stage model for the growth of the corrosion product layer was proposed, namely, the diffusion reaction stage, the local film formation stage, the complete film formation stage and the densification stage of the product film. Originality/value A four-stage model for the growth of the corrosion product layer on the pipe wall surface under this condition was proposed, namely, the diffusion reaction stage, the local film formation stage, the complete film formation stage and the densification stage of the product film. The growing process and densification mechanism of corrosion products layer were discussed.

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Near surface pH measurements in aqueous CO2 corrosion

Cited by 26 publications

References 18 publications

Corrosion Protection through Naturally Occurring Films: New Insights from Iron Carbonate

Corrosion Protection through Naturally Occurring Films: New Insights from Iron Carbonate

Kinetic and thermodynamic analysis of high-temperature CO2 corrosion of carbon steel in simulated geothermal NaCl fluids

Mesoscopic transformation at initial corrosion stage of 20# steel in aqueous solution under gas–liquid two-phase stratified flow condition

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