Raman spectroscopy and XPS investigations of anodic corrosion films formed on FeMo alloys in alkaline solutions

Thierry, Dominique; Persson, Dan; Leygraf, Christofer; Boucherit, N.; Goff, A. Hugot‐Le

doi:10.1016/0010-938x(91)90073-x

Cited by 92 publications

(38 citation statements)

References 15 publications

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“…The feature associated with magnetite is in good agreement with other studies on Raman spectra of iron oxides. [19][20][21][22][23] Hematite features observed on these samples were also in agreement with numerous studies on iron oxides. 21,[24][25][26][27] The maghemite features observed on these samples are in agreement with literature with respect to position and shape.…”

Section: Exposure Study Resultssupporting

confidence: 91%

Corrosion Behavior of Structural Materials for Potential Use in Nitrate Salts Based Solar Thermal Power Plants

Summers

Chidambaram

2017

J. Electrochem. Soc.

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Commercial and economic success of concentrated solar power (CSP) plants requires operating at maximum efficiency and capacity which necessitates the use of materials that are reliable at high temperatures. This study investigates the corrosion behavior of structural alloys in molten nitrate salts at three temperatures common to CSP plants. Corrosion behavior was evaluated using gravimetric and inductively-coupled plasma optical emission spectroscopy (ICP-OES) analysis. Surface oxide structure and chemistry was characterized using X-ray diffraction and Raman spectroscopy. Electrochemical behavior of candidate structural alloys Alloy 4130, austenitic stainless steel 316, and super-austenitic Incoloy 800H was evaluated using potentiodynamic polarization characteristics. Gravimetric and ICP-OES analysis indicated that Alloy 4130 exhibited the least corrosion resistance at 500 • C compared to SS316 and 800H. However, at 300 • C, the three alloys exhibited similar weight gain. Electrochemical evaluation of these candidate materials was observed to correlate well with the corrosion behavior observed from gravimetric and ICP-OES analysis. This study identifies that all three alloys exhibited acceptable corrosion rate in 300 • C molten salt, while elevated salt temperatures require the more corrosion resistant alloys, stainless steel 316 and 800H. Characterization of the sample surfaces revealed the presence of spinels at lower temperatures, while Fe 2 O 3 was the dominant iron oxide at higher temperatures for each alloy. Like all power plants, maximizing the conversion efficiency of solar energy in a concentrated solar power (CSP) plant is essential to minimizing cost and resources while maximizing energy output. The choice of heat transfer fluid is a fundamental parameter in maximizing efficiency of an energy source. A heat transfer fluid that can also function as an energy storage medium for solar energy while being chemically compatible with the structural components of the plant is an ideal candidate for implementation.Significant research had been performed from 1982 to 1985 on the use of molten salt as a heat transfer medium in solar power applications. Sandia National Laboratory in New Mexico conducted the Molten Salt Electric Experiment (MSEE) which was the first power tower system to use molten nitrate salt as the primary working fluid to produce electricity. This experiment proved the feasibility of using molten salt as a heat transfer medium in a central receiver design along with a two-tank storage system designed to address intermittency. 1The MSEE used a molten nitrate salt composition of 40% KNO 3 and 60% NaNO 3 by weight which is the composition used for the study presented herein.Corrosion of structural components is determined by the properties of the heat transfer fluid and corrosion resistance of the components in contact with that heat transfer fluid. Depending on the corrosion resistance of the alloy to a high-temperature, oxidizing environment, the alloy will either form an adherent, compact oxid...

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Section: Exposure Study Resultssupporting

confidence: 91%

Corrosion Behavior of Structural Materials for Potential Use in Nitrate Salts Based Solar Thermal Power Plants

Summers

Chidambaram

2017

J. Electrochem. Soc.

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“…Therefore, is accepted as being 3, due to the fact that Fe 3+ is the dominant oxidation state of iron in the inner oxide layer. Regarding the oxidation state of iron in the outer-layer (solution), studies reported in the literature [7,13,16], where the lowest applied potential is around -300 mV, have observed Fe 3+ hydroxides and/or oxyhydroxide (␥-FeOOH, ␣-FeOOH, Fe(OH) 3 , etc. ), being the major species existing in the outer region of the passive film (corresponding to the precipitated outer-layer in our double-layer film model) formed on iron in alkaline solutions (pH 13.0∼14.0).…”

Section: Modelling Theorymentioning

confidence: 98%

“…Although there two electrons in the expression of Reaction (16), it has been generally acknowledged [10,11] that the HER occurring in alkaline solutions involves two one-electron transfer steps:…”

Section: Modelling Theorymentioning

confidence: 99%

Deconvolution of the Partial Anodic and Cathodic Processes during the Corrosion of Carbon Steel in Concrete Pore Solution under Simulated Anoxic Conditions

Lü

Kursten

Macdonald

2014

Electrochimica Acta

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“…These alloys are obtained from mechanosynthesis [29], thermal preparation [30] and electrodeposition [31] of which electrodeposition provides alloys with a wider range of compositions. The surface activity of these alloys depends on the pH of the working medium, composition, nature of the surface (crystalline/amorphous) and the phases present in the alloy [32,33]. The present communication reports the results of electrochemical preparation and characterization of Fe-Mo and Fe-Mo-Pt alloys as an anode for methanol oxidation in H 2 SO 4 media.…”

Section: Introductionmentioning

confidence: 94%

Electrochemical synthesis of Fe–Mo and Fe–Mo–Pt alloys and their electrocatalytic activity for methanol oxidation

Hoor

Tharamani

Ahmed

et al. 2007

Journal of Power Sources

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Electroplating of Fe-Mo and Fe-Mo-Pt alloys has been carried out using suitable plating bath solutions and working conditions. The deposits were characterized by SEM, XRD, TEM, EDAX, XPS and Polarization techniques. New phases appeared on heat treatment of the coatings. The composition (Fe-Mo) of the coatings and oxidation states of the alloying elements varied from the surface to the bulk of the material. The coatings acted as novel electrode materials with good electrocatalytic activities (low overpotentials) and good corrosion resistance for the anodic oxidation of methanol in H 2 SO 4 at normal working temperature. The good corrosion resistance of the Fe-Mo alloy is accounted for by the existence of an oxyhydroxide passive film on the surface. The electrocatalytic activity of the Fe-Mo-Pt alloy is considerably higher when compared to the Fe-Mo alloy and Fe alone

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Raman spectroscopy and XPS investigations of anodic corrosion films formed on FeMo alloys in alkaline solutions

Cited by 92 publications

References 15 publications

Corrosion Behavior of Structural Materials for Potential Use in Nitrate Salts Based Solar Thermal Power Plants

Corrosion Behavior of Structural Materials for Potential Use in Nitrate Salts Based Solar Thermal Power Plants

Deconvolution of the Partial Anodic and Cathodic Processes during the Corrosion of Carbon Steel in Concrete Pore Solution under Simulated Anoxic Conditions

Electrochemical synthesis of Fe–Mo and Fe–Mo–Pt alloys and their electrocatalytic activity for methanol oxidation

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