Transmission Line Modeling Applied to Hot Corrosion of Fe-40at.pctAl in Molten LiCl–KCl

Barraza-Fierro, Jesus Israel; Espinosa-Medina, M. A.; Castaneda, Homero

doi:10.1007/s11663-015-0430-y

Cited by 4 publications

(5 citation statements)

References 47 publications

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“…15,26 Similar to most other studies in molten salts, a Pt pseudo-reference was used in this study and thus the reported potentials are relative to the Pt pseudo-reference electrode. 13,26,[38][39][40] The lowest average corrosion current density was 0.225 mA cm −2 for alloy UNS N06230, and the highest average corrosion current density was 0.431 mA cm −2 for alloy UNS N06625GR1. These values correspond well to values reported for other nickel-based,…”

Section: Resultsmentioning

confidence: 97%

Corrosion Behavior of High Nickel Alloys in Molten Nitrate Solar Salt

ONeill

Karmiol

Groth³

et al. 2021

J. Electrochem. Soc.

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Electrochemical corrosion testing was used to evaluate the corrosion resistance of four different nickel-based alloys, namely UNS N06230, UNS N06025, UNS N06617, and UNS N06625, in a molten nitrate salt that is used as a heat transfer media and thermal energy storage material in solar-thermal power plants. The tests were conducted at 500 °C to simulate near-maximum service temperature in the 3:2 by weight sodium nitrate: potassium nitrate mixture. All tested samples had corrosion current densities on the order of 10−4 A cm−2 with corrosion potentials varying from −227 mV to −66.2 mV vs Pt. The tested samples exhibited low corrosion current density in the range of 0.225 mA cm−2 to 0.431 mA cm−2. The morphology of the samples surfaces was studied using scanning electron microscopy which showed the formation of a surface film on all samples. Cross-sectional analysis was performed using focused ion beam scanning electron microscopy. The surface chemistry was ascertained using energy dispersive spectroscopy, X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Raman spectra paired with XPS suggested the formation of various nickel-chromium-iron spinels on UNS N06625. These results show that UNS N06625 has the potential to be a material for use in solar-thermal plants.

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Section: Resultsmentioning

confidence: 97%

Corrosion Behavior of High Nickel Alloys in Molten Nitrate Solar Salt

ONeill

Karmiol

Groth³

et al. 2021

J. Electrochem. Soc.

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“…The addition of Li, Cu, Ag, Ni has been done to improve the mechanical properties of a Fe-40 at.-% Al alloy [30]. In order to understand the effects of these additions on hot corrosion, research has been done in molten LiCl-KCl [4,5] and NaCl-KCl [31]. The effects of Li and Cu on the corrosion behaviour have been studied using polarisation curves [4], polarisation resistance [4], and electrochemical impedance spectroscopy [5] in a eutectic system of molten LiCl-KCl.…”

Section: Introductionmentioning

confidence: 99%

“…High-temperature oxidation can occur in different types of industrial equipment, such as steam-reforming tubes, nuclear processing reactors, gas turbine blades, waste incinerators, oil-fired boilers/superheaters, and similar systems [4,5]. The problems that occur at temperatures higher than 800°C could be resolved using alloys that are capable of producing protective oxide scales [6].…”

Section: Introductionmentioning

confidence: 99%

“…To summarise, Cu and Li additions to the Fe–40at.-% Al intermetallic have been shown to improve the strength [30], and their effects on the corrosion performance in molten chlorides have been characterised [4,5]. However, there are no studies on the effects of addition of these two elements on the oxidation behaviour of Fe–40 at.-% Al in rich oxygen atmospheres, so this work aims to characterise the oxidation behaviour.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation behaviour of Fe–40 at.-% Al intermetallics with Li or Cu additions at high temperature

Barraza-Fierro

Espinosa-Medina

Castaneda

2017

Corrosion Engineering, Science and Technology

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Fe-40 at.-% Al intermetallics with the addition of Li (1 and 3 at.-%) and Cu (3 and 5 at.-%) were produced using standard casting techniques. The oxidation behaviour was obtained using thermogravimetric analyses in an atmosphere of 99.99% oxygen at 800, 900, 1000, and 1100°C. The oxidation product layers on the top and cross-sectional views were characterised using SEM and energy-dispersive X-ray spectroscopy mapping. The different alumina phases can produce a double layer with different mechanical and chemical properties. The results showed that the addition of 1% Li assisted the activation of the oxide production at 1000 and 1100°C, while the rest of the third element additions slightly modified the oxidation resistance.

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“…Tungsten, silver, and platinum were chosen as possible candidates due to their widespread usage in chloride and fluoride based molten salt electrochemical studies. [1][2][3][4][5][6][7][8][9][10] We are unaware of any work performed to study these QREs in the chosen salt system, which serves as the motivation for this work. The criteria used to select the most suitable QRE for this molten salt system included the stability of the Ce(0)/Ce(III) reaction peak throughout the implemented cyclic voltammetry technique (CV); the percentage change of the measured current respective to the oxidation peak in the voltammogram graphs of each succeeding cycle relative to the measured in the first cycle (Δ%) was used as a metric of stability.…”

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confidence: 99%

Investigation of W, Ag, and Pt Quasi-Reference Electrode Stability in Molten NaCl-CaCl₂ with Ce(0)/Ce(III) as an Internal Reference Redox Reaction

Killinger

Phongikaroon

2021

J. Electrochem. Soc.

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This work reports on the stability of quasi-reference electrode (QRE) material candidates for use in a NaCl-CaCl2 molten salt eutectic at 823 K in comparison to that of the conventional Ag(I)/Ag reference electrode in a mullite sheath with cyclic voltammetry (CV) and an internal reference of the cerium redox couple (Ce(0)/Ce() via CeCl3 addition). In addition, effects of QRE size, working electrode surface area, and scan rate were investigated for potential QRE candidates. A tungsten rod (1.5 mm) has been determined to be most stable with repeatable results and a long usable life of the QRE materials studied. The stability of the measured current using the tungsten quasi-reference electrode is affected by both scan rate (mV/s) and surface area of the working electrode during the CV technique. In contrast to tungsten, the stability of the platinum wires in this system were considered poor. Silver wire becomes more stable with increasing size.

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Transmission Line Modeling Applied to Hot Corrosion of Fe-40at.pctAl in Molten LiCl–KCl

Cited by 4 publications

References 47 publications

Corrosion Behavior of High Nickel Alloys in Molten Nitrate Solar Salt

Corrosion Behavior of High Nickel Alloys in Molten Nitrate Solar Salt

Oxidation behaviour of Fe–40 at.-% Al intermetallics with Li or Cu additions at high temperature

Investigation of W, Ag, and Pt Quasi-Reference Electrode Stability in Molten NaCl-CaCl₂ with Ce(0)/Ce(III) as an Internal Reference Redox Reaction

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Transmission Line Modeling Applied to Hot Corrosion of Fe-40at.pctAl in Molten LiCl–KCl

Cited by 4 publications

References 47 publications

Corrosion Behavior of High Nickel Alloys in Molten Nitrate Solar Salt

Corrosion Behavior of High Nickel Alloys in Molten Nitrate Solar Salt

Oxidation behaviour of Fe–40 at.-% Al intermetallics with Li or Cu additions at high temperature

Investigation of W, Ag, and Pt Quasi-Reference Electrode Stability in Molten NaCl-CaCl2 with Ce(0)/Ce(III) as an Internal Reference Redox Reaction

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Investigation of W, Ag, and Pt Quasi-Reference Electrode Stability in Molten NaCl-CaCl₂ with Ce(0)/Ce(III) as an Internal Reference Redox Reaction