Sorption of silicon on magnetite and other corrosion products of iron

Philippini, Violaine; Naveau, Aude; Catalette, H.; Leclercq, Stéphanie

doi:10.1016/j.jnucmat.2005.09.002

Cited by 56 publications

(28 citation statements)

References 20 publications

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“…The site density is close to values found for magnetite in several previous studies (1.9-2.3 at nm −2 ) [3,6], while much higher values (4.4, 6.7 at nm −2 ) were found in other works [1,7]. The PZC value is close to the values found previously [1][2][3][4][5]7], while a large spread can be observed in the difference between the published pK + and pK − values. In our case, we have found that pK + and pK − are rather close to the PZC.…”

Section: Acid-base Properties Of Magnetitesupporting

confidence: 90%

“…As a comparison to the sorption of anionic species on magnetite, according to fitting results, silicate form bidentate IS complexes [7], while Se(IV) and Se(VI) form monodentate IS complexes and OS complexes, respectively [6].…”

Section: Sorption Of Sulfatementioning

confidence: 99%

“…Previous studies of the sorption properties of magnetite were connected to its formation as corrosion product from metallic containers in radioactive waste repositories [1][2][3][4][5][6][7]. These studies showed that Pu(V) [4] and U(VI) [5] are reduced during sorption experiments on magnetite, while Se(VI) [6] is not reduced.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sorption of sulfate ions onto magnetite

Mansour¹,

Lefèvre

Pavageau³

et al. 2009

Journal of Colloid and Interface Science

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Section: Acid-base Properties Of Magnetitesupporting

confidence: 90%

Section: Sorption Of Sulfatementioning

confidence: 99%

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Sorption of sulfate ions onto magnetite

Mansour¹,

Lefèvre

Pavageau³

et al. 2009

Journal of Colloid and Interface Science

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“…The nitrogen groups in the ammonium moiety are known to be good etchants in a similar way to the nitrogen groups recurrently used in any generic CO 2 CI and the Si-group from the OA-POSS molecule core is known to have good sorption on many corrosion products. 34 The nanofiller was dissolved at different loadings in CO 2 saturated distilled water at 60°C before being added with a pipette after the CS X65 samples have been subjected to 2 h of pre-corrosion. The OA-POSS weight to be added was computed as if 3-5% by weight of the (FeCO 3 + OA-POSS) blend should be added to incorporate in a 50 μm thick FeCO 3 film since POSS moieties appears to be most efficient in these ranges.…”

Section: Discussionmentioning

confidence: 99%

Siderite micro-modification for enhanced corrosion protection

et al. 2017

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Production of oil and gas results in the creation of carbon dioxide (CO2) which when wet is extremely corrosive owing to the speciation of carbonic acid. Severe production losses and safety incidents occur when carbon steel (CS) is used as a pipeline material if corrosion is not properly managed. Currently corrosion inhibitor (CI) chemicals are used to ensure that the material degradation rates are properly controlled; this imposes operational constraints, costs of deployment and environmental issues. In specific conditions, a naturally growing corrosion product known as siderite or iron carbonate (FeCO3) precipitates onto the internal pipe wall providing protection from electrochemical degradation. Many parameters influence the thermodynamics of FeCO3 precipitation which is generally favoured at high values of temperatures, pressure and pH. In this paper, a new approach for corrosion management is presented; micro-modifying the corrosion product. This novel mitigation approach relies on enhancing the crystallisation of FeCO3 and improving its density, protectiveness and mechanical properties. The addition of a silicon-rich nanofiller is shown to augment the growth of FeCO3 at lower pH and temperature without affecting the bulk pH. The hybrid FeCO3 exhibits superior general and localised corrosion properties. The findings herein indicate that it is possible to locally alter the environment in the vicinity of the corroding steel in order to grow a dense and therefore protective FeCO3 film via the incorporation of hybrid organic-inorganic silsesquioxane moieties. The durability and mechanical integrity of the film is also significantly improved.

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“…For example, silicon released from waste glass can adsorb on the surface of magnetite and other corrosion products of iron (Philippini et al, 2006). In addition, bentonite dissolution can be enhanced at high pH (Davydov et al, 2005) at early time was not considered in the current study (when the repository is partially saturated and the waste containers are at relatively high temperatures).…”

Section: Assumptions and Limitationsmentioning

confidence: 99%

Corrosion-induced gas generation in a nuclear waste repository: Reactive geochemistry and multiphase flow effects

Senger²,

Finsterle

2008

Applied Geochemistry

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Abstract. Corrosion of steel canisters, stored in a repository for spent fuel and high-level nuclear wastes, leads to the generation and accumulation of hydrogen gas in the backfilled emplacement tunnels, which may significantly affect long-term repository safety. Previous studies used H 2 generation rates based on the volume of the waste or canister material and the stochiometry of the corrosion reaction. However, iron corrosion and H 2 generation rates vary with time, depending on factors such as amount of iron, water availability, water contact area, and aqueous and solid chemistry. To account for these factors and feedback mechanisms, we developed a chemistry model related to iron corrosion, coupled with two-phase (liquid and gas) flow phenomena that are driven by gas-pressure buildup associated with H 2 generation and water consumption. Results indicate that by dynamically calculating H 2 generation rates based on a simple model of corrosion chemistry, and by coupling this corrosion reaction with two-phase flow processes, the degree and extent of gas pressure buildup could be much smaller compared to a model that neglects the coupling between flow and reactive transport mechanisms. By considering the feedback of corrosion chemistry, the gas pressure increases initially at the canister, but later decreases and eventually returns to a stabilized pressure that is slightly higher than the background pressure. The current study focuses on corrosion under anaerobic conditions for which the coupled hydrogeochemical model was used to examine the role of selected physical parameters on the H 2 gas generation and corresponding pressure buildup in a nuclear waste repository. The developed model can be applied to evaluate the effect of water and mineral chemistry of the buffer and host rock on the corrosion reaction for future site-specific studies.

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Sorption of silicon on magnetite and other corrosion products of iron

Cited by 56 publications

References 20 publications

Sorption of sulfate ions onto magnetite

Sorption of sulfate ions onto magnetite

Siderite micro-modification for enhanced corrosion protection

Corrosion-induced gas generation in a nuclear waste repository: Reactive geochemistry and multiphase flow effects

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