A study by electrochemical impedance spectroscopy and surface analysis of corrosion product layers formed during CO2 corrosion of low alloy steel

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

doi:10.1016/j.corsci.2020.108666

Cited by 101 publications

(38 citation statements)

References 17 publications

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“…Analysis of the impedance spectra shows different impedance responses, depending on the exposure material (i.e., the different mortars) and the time of exposure (i.e., the number of wet/dry cycles), indicating the active/passive state of steel reinforcement and the different types of corrosion mechanisms that should be considered when interpreting the measured EIS values. The incomplete arc at high frequencies that is associated with bulk phenomena [ 24 , 45 , 46 , 47 ] is omitted from the interpretation; the discussion focuses on the parts measured at medium and low frequencies, when the system response represents faradaic processes. In the FA8 and MK2 mortars, the spectra obtained show that one time constant was prevalent at the beginning of the exposure.…”

Section: Discussionmentioning

confidence: 99%

Characterizing Steel Corrosion in Different Alkali-Activated Mortars

et al. 2021

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Alkali-activated materials (AAMs) present a promising potential alternative to ordinary Portland cement (OPC). The service life of reinforced concrete structures depends greatly on the corrosion resistance of the steel used for reinforcement. Due to the wide range and diverse properties of AAMs, the corrosion processes of steel in these materials is still relatively unknown. Three different alkali-activated mortar mixes, based on fly ash, slag, or metakaolin, were prepared for this research. An ordinary carbon-steel reinforcing bar was installed in each of the mortar mixes. In order to study the corrosion properties of steel in the selected mortars, the specimens were exposed to a saline solution in wet/dry cycles for 17 weeks, and periodic electrochemical impedance spectroscopy (EIS) measurements were performed. The propagation of corrosion damage on the embedded steel bars was followed using X-ray computed microtomography (μXCT). Periodic EIS measurements of the AAMs showed different impedance response in individual AAMs. Moreover, these impedance responses also changed over the time of exposure. Interpretation of the results was based on visual and numerical analysis of the corrosion damages obtained by μXCT, which confirmed corrosion damage of varying type and extent on steel bars embedded in the tested AAMs.

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Section: Discussionmentioning

confidence: 99%

Characterizing Steel Corrosion in Different Alkali-Activated Mortars

et al. 2021

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“…Other authors agree with the previous analysis in the first period of the corrosion process, whereas at longer exposure time, the metal surface is protected by a diffusion limitation of the electroactive species and not simply by the blocking of electrochemically active sites. [50]…”

Section: Corrosion Protection Of the Cplmentioning

confidence: 99%

The effect of chemical species on the electrochemical reactions and corrosion product layer of carbon steel in CO₂ aqueous environment: A review

Basilico

Marcelin

Mingant

et al. 2021

Materials & Corrosion

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This study summarizes the chemical effects that can occur during the corrosion process of carbon steel in a CO 2 -saturated aqueous environment. Particularly, it focuses more on the results that small chemical contaminations in the environment have on the corrosion process. Underground waters present complex chemistry with several different dissolved ions (chlorides, carbonates) even in high concentrations that impact substantially the corrosion rates of these materials. Moreover, gas impurities present in the gas mixture, such as oxygen in carbon capture and storage applications, constitute a supplementary form of significant contamination in the CO 2 -saturated aqueous environment.In particular, the effect on both electrochemical reactions and corrosion product layer is examined for several chemical species that are commonly present either in the gas mixture or in underground waters.Carbon steel remains the most popular material for industrial applications because of its lower cost with respect to corrosion-resistant alloys. [1,2] Nevertheless, inferior corrosion resistance performances lead to a deep investigation of the corrosion process in various environments. Furthermore, numerous actions were adopted to prevent corrosion rate value to reach unsustainable costs, such as corrosion inhibitors, cathodic protection, and coatings. In relation to a deep knowledge of the corrosion mechanisms, each method of protection has to be designed carefully to successfully address the specific corrosion problem.This bibliographic report concerns the issues related to carbon steel corrosion in a CO 2 water solution, particularly, the effects of some chemical elements of the solution that can impact the mechanism of the electrochemical reactions of the corrosion process. Their effects may be direct or indirect through modifications of the nature of the corrosion product layer (CPL).Understanding and mitigation of CO 2 aqueous corrosion of carbon steels are a major challenge in many industries, such as oil production (including enhanced oil recovery [EOR]), CO 2 capture, transportation, storage and utilization, biofuels refining, and geothermal energy production. Considering the oilfield brines and oils, their composition is quite complex, with a plethora of chemicals that can interact with carbon steel. [3,4] Therefore, a small selection of common water components and those presenting new challenges for carbon capture and storage and geothermal energy production are presented.

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“…The R ct and Q dl characterize the corrosion reactions (at HF), and R f and Q f represent the characteristics of the corrosion product layer (at MF). The observed changes in R f and Q f can be attributed to the formation of the corrosion products, which covers the surface leading to a reduction in the active surface area [41]. While R f decreases with the corrosion time, indicating that the charge transfer is the main control step of corrosion and R f is small due to surface cracking at 4-5 d. At the same time, it found that when corroded for 3 d, the diffusion resistance (W R ) and diffusion exponent (W p ) of the Warburg component (at LF) is 428.5 Ω•cm −2 and 0.39, respectively.…”

Section: Electrochemical Impedance Spectrummentioning

confidence: 99%

Effect of Corrosion Time on the Synergistic Corrosion of Q235 Steel in Sodium Aluminate Solutions

Quan

Chen

2021

Metals

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During Bayer alumina production with high-sulfur bauxite, the sulfide ions in the sodium aluminate solution caused serious corrosion to Q235 steel, which is the material of the tank equipment. This study investigates the effect of corrosion time on Q235 steel synergistic corrosion in sodium aluminate solution using the weight-loss method and electrochemical measurements. The results indicate that the corrosion rate decreases sharply, the rate equation satisfies the mathematical model of power function at the initial stage of corrosion, and the transformation of unstable iron sulfide to stable iron oxide at the later stage results in the decrease in sulfur content in the corrosion products and surface pseudo-passivation. There are two main types of corrosion products, as follows: one is the octahedral crystal particle, which is composed of Fe2O3, Fe3O4, Al2O3 and NaFeO2, and the other is the interlayer corrosion between the surface layer and the matrix, which is composed of FeS, FeS2 and MnS2. At day 3, the dynamics of the Q235 steel electrode is controlled by charge transfer and ion diffusion. However, at other times the dynamics are mainly controlled by charge transfer.

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A study by electrochemical impedance spectroscopy and surface analysis of corrosion product layers formed during CO2 corrosion of low alloy steel

Cited by 101 publications

References 17 publications

Characterizing Steel Corrosion in Different Alkali-Activated Mortars

Characterizing Steel Corrosion in Different Alkali-Activated Mortars

The effect of chemical species on the electrochemical reactions and corrosion product layer of carbon steel in CO₂ aqueous environment: A review

Effect of Corrosion Time on the Synergistic Corrosion of Q235 Steel in Sodium Aluminate Solutions

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A study by electrochemical impedance spectroscopy and surface analysis of corrosion product layers formed during CO2 corrosion of low alloy steel

Cited by 101 publications

References 17 publications

Characterizing Steel Corrosion in Different Alkali-Activated Mortars

Characterizing Steel Corrosion in Different Alkali-Activated Mortars

The effect of chemical species on the electrochemical reactions and corrosion product layer of carbon steel in CO2 aqueous environment: A review

Effect of Corrosion Time on the Synergistic Corrosion of Q235 Steel in Sodium Aluminate Solutions

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The effect of chemical species on the electrochemical reactions and corrosion product layer of carbon steel in CO₂ aqueous environment: A review