A coupled electrochemical–geochemical model of corrosion for mild steel in high-pressure CO2–saline environments

Han, Jianxin; Carey, J. William; Zhang, Jinsuo

doi:10.1016/j.ijggc.2011.02.005

Cited by 35 publications

(32 citation statements)

References 34 publications

(25 reference statements)

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“…Interestingly, there was no XRD evidence of FeCO 3 scale, which is commonly seen in CO 2 environments. In order to investigate this phenomenon, we sampled the aqueous solutions after the corrosion experiments (Table 3) and used a water chemistry model [10] to calculate aqueous speciation and mineral stability at equilibrium with a 0.97 bar atmosphere of CO 2 . The calculations showed that the iron carbonate concentration was at least 10,000 times lower than the saturation level for iron carbonate, consistent with the lack of iron carbonate scale.…”

Section: Characterization Of the Corroded Surfacementioning

confidence: 99%

“…We previously developed a coupled water chemistryelectrochemical corrosion model [10]. In the water chemistry model, Pitzer's activity model was used for the aqueous solution, and the model has the capability to accurately predict thermodynamics of the aqueous CO 2 system: …”

Section: Model Simulation Of Salt Effect On Corrosionmentioning

confidence: 99%

“…In particular, we found that water chemistry was not well represented due to the highsalinity environment, which limits model application. We recently have developed a mechanistic electrochemical corrosion model coupling an accurate water chemistry model applied for these extreme geologic conditions [10]. The model correctly predicts reduced corrosion rates as salinity increases in CO 2 -saturated brined due to reduced solubility of CO 2 or in other words, the ''salting-out'' effect of sodium chloride.…”

Section: Introductionmentioning

confidence: 99%

“…The corrosion surface was examined using scanning and backscattered electron microscopy (SEM and BSE), energy dispersive spectroscopy (EDX), and X-ray diffraction (XRD) to determine corrosion mechanisms. The experiments were used to test our corrosion model [10] at low CO 2 pressure and high-salinity conditions. The model was then used to understand potential mechanisms for the flow-independent corrosion behavior of high-salinity, O 2 -free, CO 2 -systems.…”

Section: Introductionmentioning

confidence: 99%

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Effect of sodium chloride on corrosion of mild steel in CO2-saturated brines

2011

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Corrosion rates of mild steel were measured in oxygen-free, CO 2 -saturated brines as a function of NaCl concentration employing electrochemical techniques. Decreased corrosion rates were observed as salt concentration increased. However, at high salt concentration (C20 wt% NaCl), corrosion rates were independent of the flow rate of CO 2 -saturated brine. To understand this phenomenon, corrosion surfaces were analyzed by scanning electron microscopy and X-ray diffraction and showed only residual iron carbide for salt concentrations of 0.5-5 wt%. However, at 20 wt% NaCl, a porous corrosion scale with embedded crystals, possibly magnetite, was observed. No iron carbonate was observed and water chemistry showed it was 10,000 times below saturation. A numerical model of corrosion in CO 2 -NaCl systems was able to predict the reduced corrosion rates with salt concentration increase as a consequence of reduced solubility of CO 2 (''saltingout''). However, the model did not predict that corrosion rates were flow-independent at high salt concentration. These results demonstrate that flow-independent corrosion is a consequence of a diffusion barrier created by magnetite scale, present only at high salt concentrations.

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Section: Characterization Of the Corroded Surfacementioning

confidence: 99%

Section: Model Simulation Of Salt Effect On Corrosionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of sodium chloride on corrosion of mild steel in CO2-saturated brines

2011

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“…Han a kol. [17] potvrdili, že rychlost koroze roste s rostoucím parciálním tlakem CO 2 , a také popsal vliv NaCl na snížení rozpustnosti CO 2 : snížení koncentrace rozpuštěného CO 2 při vyšší koncentraci soli vede k poklesu koncentrace kyseliny uhličité a tím i korozní rychlosti.…”

Section: úVodunclassified

Corrosion behaviour of steel CSN 422707.9 in concentrated synthetic bentonite pore water

Novikova

Kouřil

Msallamová

et al. 2016

Koroze a Ochrana Materialu

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Concentrating of pore bentonite water as a result of water evaporation at the hot container surface is expected when the bentonite cover of the permanent nuclear waste container is being gradually saturated. The study assesses the influence of an extent of the pore water enrichment by chloride and sulphate ions up to a multiple of a hundred of their equilibrium concentration. An increase of concentration of these ions does not imply an increase of the electrolyte aggressivity automatically. A minimum of corrosion resistance was observed at triplicate concentration at all temperatures, 40, 70 and 90°C. Even more significant impact on corrosion behaviour was recognized for composition of anoxic atmosphere above the electrolyte. Contrary to nitrogen, the mixture of nitrogen and carbon dioxide remarkably elevates the electrolyte’s corrosion aggressivity.

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A Review of Studies Examining the Potential for Groundwater Contamination From CO ₂ Sequestration

Varadharajan¹,

Tinnacher²,

Trautz³

et al. 2018

Geological Carbon Storage

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A coupled electrochemical–geochemical model of corrosion for mild steel in high-pressure CO2–saline environments

Cited by 35 publications

References 34 publications

Effect of sodium chloride on corrosion of mild steel in CO2-saturated brines

Effect of sodium chloride on corrosion of mild steel in CO2-saturated brines

Corrosion behaviour of steel CSN 422707.9 in concentrated synthetic bentonite pore water

A Review of Studies Examining the Potential for Groundwater Contamination From CO ₂ Sequestration

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A coupled electrochemical–geochemical model of corrosion for mild steel in high-pressure CO2–saline environments

Cited by 35 publications

References 34 publications

Effect of sodium chloride on corrosion of mild steel in CO2-saturated brines

Effect of sodium chloride on corrosion of mild steel in CO2-saturated brines

Corrosion behaviour of steel CSN 422707.9 in concentrated synthetic bentonite pore water

A Review of Studies Examining the Potential for Groundwater Contamination From CO 2 Sequestration

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Product

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A Review of Studies Examining the Potential for Groundwater Contamination From CO ₂ Sequestration