Effect of Li and Cu addition on corrosion of Fe–40at.% Al intermetallics in molten LiCl–KCl eutectic salt

Barraza-Fierro, Jesus Israel; Espinosa-Medina, M. A.; Hernández-Hernández, Maricruz; Liu, Hong Bo; Sosa-Hernández, E.

doi:10.1016/j.corsci.2012.02.020

Cited by 27 publications

(14 citation statements)

References 19 publications

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“…Electrochemical techniques for molten salt corrosion can be used to rapidly identify the best-performing alloys. Recently, these techniques have been used for a better understanding of the fundamentals behind the molten salt corrosion mechanisms for thin-film molten salts in gas-turbine engines and electric power generation [7][8][9][10]. Molten-salt corrosion of Inconel 625 (IN625) in salts containing sulfates, oxides, and chlorides at 600°, 700°, and 800°C reported corrosion rates of 1.80 7 0.33, 14.257 2.01, and 26.5471.69 mm/year, respectively.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies

Vidal

Tirawat

2016

Solar Energy Materials and Solar Cells

179

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a b s t r a c tNext-generation solar power conversion systems in concentrating solar power (CSP) applications require high-temperature advanced fluids in the range of 600-800°C. Current commercial CSP plants use molten nitrate salt mixtures as the heat transfer fluid and the thermal energy storage (TES) media while operating with multiple hours of energy capacity and at temperatures lower than 565°C. At higher temperatures, the nitrates cannot be used because they decompose. Molten chloride salts are candidates for CSP applications because of their high decomposition temperatures and good thermal properties; but they can be corrosive to common alloys used in vessels, heat exchangers, and piping at these elevated temperatures. In this article, we present the results of the corrosion evaluations of several alloys in eutectic 34.42 wt% NaCl -65.58 wt% LiCl at 650-700°C in nitrogen atmosphere. Electrochemical evaluations were performed using open-circuit potential followed by a potentiodynamic polarization sweep. Corrosion rates were determined using Tafel slopes and Faraday's law. A temperature increase of as little as 50°C more than doubled the corrosion rate of AISI stainless steel 310 and Incoloy 800H compared to the initial 650°C test. These alloys exhibited localized corrosion. Inconel 625 was the most corrosionresistant alloy with a corrosion rate of 2.80 7 0.38 mm/year. For TES applications, corrosion rates with magnitudes of a few millimeters per year are not acceptable because of economic considerations. Additionally, localized corrosion (intergranular or pitting) can be catastrophic. Thus, corrosion-mitigation approaches are required for advanced CSP plants to be commercially viable.

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Section: Introductionmentioning

confidence: 99%

Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies

Vidal

Tirawat

2016

Solar Energy Materials and Solar Cells

179

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“…To determine the required time for the electrical stabilization of the Pt-pseudo-RE vs the Pt-CE the potential of the electrodes immersed in the molten salts was recorded with time. Figure 6 shows that the stabilization time in a chloride molten salt was around 45 minutes as reported by the literature [10][11][12][13][14]. After each corrosion test the chemical stability of these electrodes was evaluated using visual observations.…”

Section: Electrochemical Corrosion Testingmentioning

confidence: 74%

“…Pt-mesh spot-welded to Pt-wire was used as the counter electrode (CE). Platinum has been recommended by several researchers for high temperature molten salt corrosion evaluations using electrochemical techniques [10][11][12][13][14].…”

Section: Electrochemical Corrosion Testing For Salt Permeability Detementioning

confidence: 99%

“…A drawing and a picture of the three-electrode arrangement inside of the electrochemical cell is shown in Figure 4. After reaching one hour of thermal stability at the testing temperature, the Pt-pseudo-RE and the Pt-CE were immersed and allowed to stabilize during 60 min before immersing the sample/WE [10][11][12][13][14]. The sample/WE was immersed 3-4 mm in the molten salt after RE and CE stabilization time.…”

Section: Electrochemical Corrosion Testing For Salt Permeability Detementioning

confidence: 99%

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Castable cements to prevent corrosion of metals in molten salts

Vidal

Morton

2016

Solar Energy Materials and Solar Cells

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Castable cements on metals form a protective barrier that is able to prevent permeation of molten salts towards metallic surfaces. Silica-based castable cements are capable of protecting containment metallic alloys from the corrosive attack of molten chlorides at temperatures as high as 650°C. Boron nitride (BN) blocking the pores in the cured cement prevents permeation of the molten chloride towards the metal surface. The cements tested are not chemically stable in molten carbonates, because the bonding components dissolved into molten carbonates salt. The corrosion rate is 7.72 ± 0.32 mm/year for bare stainless steel 347 in molten eutectic NaCl-65.58 wt% LiCl at 650°C, which is the baseline used for determining how well the cement protects the metallic surfaces from corrosion. In particular metal fully encapsulated with Aremco 645-N with pores filled with boron nitride immersed in molten eutectic NaCl-65.58 wt% LiCl at 650°C shows a corrosion rate of 9E-04 mm/year. The present study gives initial corrosion rates. Longterm tests are required to determine if Aremco 645-N with BN coating on metal has long term chemical stability for blocking salt permeation through coating pores.

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“…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%

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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Effect of Li and Cu addition on corrosion of Fe–40at.% Al intermetallics in molten LiCl–KCl eutectic salt

Cited by 27 publications

References 19 publications

Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies

Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies

Castable cements to prevent corrosion of metals in molten salts

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

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