Inhibition of Pitting in Ferrous Materials by Carbonate as a Function of Temperature and Alkalinity

Adamy, S. T.; Cala, F. R.

doi:10.5006/1.3284039

Cited by 13 publications

(10 citation statements)

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“…Pitting corrosion develops at localized and distinct points, resulting in cavities or pits (Schweitzer 2003). Such corrosion is very well documented in the materials science literature (e.g., Sutcliffe et al 1972;Stiksma and Bradford 1985;Mao et al 1994;Qiao et al 1998;Adamy and Cala 1999;Davenport et al 2000;Kritzer et al 2000). These features have an O-enrichment correlated with the (a) showing a large region of low-Z contrast at the edge of the grain.…”

Section: Are the Feni Metal Grains In Fine-grained Rims Pristine?mentioning

confidence: 73%

“…This process is caused by the very rapid consumption of protons in the fluids as hydrolysis reactions start during the earliest stages of alteration. This observation is crucial to the question of whether Fe,Ni metal grains could have survived parent-body alteration because alkaline fluids are well-known in the materials science community to inhibit the corrosion of Fe metal (e.g., Stumm and Morgan 1981;Brookins 1988;Adamy and Cala 1999). The inhibition is facilitated by the formation of an impermeable Fe(OH) 2 film (Whitman et al 1924;Stumm 1959;Sweeton and Baes 1970;Baes 1976;Davenport et al 2000) on the surface of the altering metal grains, preventing the Fe 2+ ions from going directly into solution.…”

Section: Could Feni Metal Grains Survive Asteroidal Parent Body Altementioning

confidence: 99%

“…These include the presence of dissolved silica (Amaral and Muller 1999), carbonate and bicarbonate (Sutcliffe et al 1972;Stiksma and Bradford 1985;Mao et al 1994;Keyser et al 1997;AlHassan et al 1998;Qiao et al 1998;Adamy and Cala 1999), and soluble organic materials (Malik 1995). The presence of dissolved silica promotes the formation of a hydrous gel-like Fe-Si film on the surface of the metal, which acts to enhance corrosion resistance (Amaral and Muller 1999).…”

Section: Could Feni Metal Grains Survive Asteroidal Parent Body Altementioning

confidence: 99%

“…The presence of dissolved silica promotes the formation of a hydrous gel-like Fe-Si film on the surface of the metal, which acts to enhance corrosion resistance (Amaral and Muller 1999). Corrosion resistance is also facilitated by the occurrence of CO 2 , HCO − 3 , CO 2− 3 , which all contribute to the formation of FeCO 3(aq) bicarbonate (Sutcliffe et al 1972;Stiksma and Bradford 1985;Mao et al 1994;Malik 1995;Keyser et al 1997;AlHassan et al 1998;Qiao et al 1998;Adamy and Cala 1999). All of these constituents are available and certainly mobile in CM2 chondrites during aqueous alteration.…”

Section: Could Feni Metal Grains Survive Asteroidal Parent Body Altementioning

confidence: 99%

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Untitled

2008

Meteorit & Planetary Scien

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Abstract--The presence of apparently unaltered, micron-sized Fe,Ni metal grains, juxtaposed against hydrated fine-grained rim materials in the CM2 chondrite Yamato (Y-) 791198 has been cited as unequivocal evidence of preaccretionary alteration. We have examined the occurrence, composition, and textural characteristics of 60 Fe,Ni metal grains located in fine-grained rims in Y-791198 using scanning electron microscopy (SEM) and electron microprobe analysis. In addition, three metal grains, prepared by focused ion beam (FIB) sample preparation techniques were studied by transmission electron microscopy (TEM). The metal grains are heterogeneously distributed within the rims. Electron microprobe analyses show that all the metal grains are kamacite with minor element contents (P, Cr, and Co) that lie either within or close to the range for other CM2 metal grains. X-ray maps obtained by electron microprobe show S, P, and/or Ca enrichments on the outermost parts of many of the metal grains. Z-contrast STEM imaging of FIB-prepared Fe,Ni metal grains show the presence of a small amount of a lower Z secondary phase on the surface of the grains and within indentations on the grain surfaces. Energy-filtered TEM (EFTEM) compositional mapping shows that these pits are enriched in oxygen and depleted in Fe relative to the metal. These observations are consistent with pitting corrosion of the metal on the edges of the grains and we suggest may be the result of the formation of Fe(OH) 2 , a common oxidation product of Fe metal. The presence of such a layer could have inhibited further alteration of the metal grains. These findings are consistent with alteration by an alkaline fluid as suggested by Zolensky et al. (1989), but the location of this alteration remains unconstrained, because Y-791198 was recovered from Antarctica and therefore may have experienced incipient terrestrial alteration. However, we infer that the extremely low degree of oxidation of the metal is inconsistent with weathering in Antarctica and that alteration in an extraterrestrial environment is more probable. Although the presence of unaltered or incipiently altered metal grains in these fine-grained rims could be interpreted as evidence for preaccretionary alteration, we suggest an alternative model in which metal alteration was inhibited by alkaline fluids on the asteroidal parent body.

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Section: Are the Feni Metal Grains In Fine-grained Rims Pristine?mentioning

confidence: 73%

Section: Could Feni Metal Grains Survive Asteroidal Parent Body Altementioning

confidence: 99%

Section: Could Feni Metal Grains Survive Asteroidal Parent Body Altementioning

confidence: 99%

Section: Could Feni Metal Grains Survive Asteroidal Parent Body Altementioning

confidence: 99%

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Untitled

2008

Meteorit & Planetary Scien

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“…The corrosion reactions in these conditions are considerably intertwined, electrochemical, and chemical, during which the cathodic reduction, anodic dissolution, and passivation are relatively similarly sensitive to the chemical composition of the environment and the metallurgy of the steel ( . Carbonate affects the aqueous equilibrium as it raises the pH, generates bicarbonate, and restricts the roles of the dissolved oxygen (Ref [12][13][14]. It affects the transport and reduction mechanisms of water, oxygen, and hydrogen protons, and gets adsorbed onto the surface to oxidize the steel, raise the local alkalinity, and form Fe(OH) 2 , FeCO 3 , and other intermediate products as green rust (Ref [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Modeling Corrosion Reactions of Steel in a Dilute Carbonate Solution

Eliyan

Alfantazi

2016

J. of Materi Eng and Perform

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This research models the corrosion reactions of a high-strength steel in an aerated, dilute, carbonate solution during a single-cycle voltammetry. Based on a previous study (Eliyan et al. in J Mater Eng Perform 24(6):1-8, 2015) and a literature survey, the corrosion reactions of the cathodic reduction, anodic dissolution, and passivation, as well as the interfacial interactions and the chemistry of the corrosion products are illustrated in schematics. The paper provides a visual guide on the corrosion reactions for steel in carbonate solutions based on the available mechanistic details that were reported and are still being investigated in literature.

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Environmental Factors Affecting Corrosion Inhibition in Oil and Gas Industry

Migahed

2020

Corrosion Inhibitors in the Oil and Gas Industry

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Inhibition of Pitting in Ferrous Materials by Carbonate as a Function of Temperature and Alkalinity

Cited by 13 publications

References 0 publications

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Modeling Corrosion Reactions of Steel in a Dilute Carbonate Solution

Environmental Factors Affecting Corrosion Inhibition in Oil and Gas Industry

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