The Effect of Water Vapor on High Temperature Oxidation of Fe-Cr Alloys at 1073 K

Ani, Mohd Hanafi; Kodama, Toshiya; Ueda, Mitsutoshi; Kawamura, Kazutaka; Maruyama, Toru

doi:10.2320/matertrans.m2009212

Cited by 62 publications

(33 citation statements)

References 19 publications

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“…[1], it was proposed that the dissolution of hydrogen from the water vapor increased the oxygen permeability (the product N O (S) D O ) and thus increased N Cr (1) . Similar observations were recently made by Ani et al [17] who reported that the effective oxygen permeability was increased by a factor of 1.4 in the presence of water vapor because the internal oxide particles become elongated normal to the specimen surface and accelerate oxygen diffusion along interphase boundaries. An explanation of the mechanism for the change in morphology was not offered.…”

Section: Selective Oxidation Of Chromium From Ferritic Fe-cr Alloyssupporting

confidence: 74%

Effect of Alloy Composition and Exposure Conditions on the Selective Oxidation Behavior of Ferritic Fe–Cr and Fe–Cr–X Alloys

et al. 2010

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Selective oxidation behavior of ferritic martensitic Fe-Cr base alloys, exposed in various atmospheres containing combinations of O 2 , CO 2 , and H 2 O, were studied at various temperatures relevant to oxy-fuel combustion. This paper begins with a discussion of the required Cr content to form a continuous external chromia scale on a simple binary Fe-Cr alloy exposed in oxygen or air based on experiments and calculations using the classic Wagner model. Then, the effects of the exposure environment and Cr content on the selective oxidation of Fe-Cr alloys are evaluated. Finally, the effects produced by alloying additions of Si, commonly present in various groups of commercially available ferritic steels, are described. The discussion compares the oxide scale formation on simple binary and ternary Fe-Cr base model alloys with that on several commercially available ferritic steels.

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Section: Selective Oxidation Of Chromium From Ferritic Fe-cr Alloyssupporting

confidence: 74%

Effect of Alloy Composition and Exposure Conditions on the Selective Oxidation Behavior of Ferritic Fe–Cr and Fe–Cr–X Alloys

et al. 2010

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“…In Essuman et al (3), it was proposed that the dissolution of hydrogen from the water vapor increased the oxygen permeability in the oxide and thus increased the critical Cr content required to form a protective chromia scale (unless conditions dictate that the critical Cr content is controlled by Cr diffusion within the alloy). Similar observations were recently made by Ani et al (4) who reported that the effective oxygen permeability was increased by a factor of 1.4 in the presence of water vapor because the internal oxide particles become elongated normal to the specimen surface and accelerate oxygen diffusion along interphase boundaries. An explanation of the mechanism for the change in morphology was not offered.…”

Section: Short-term Testssupporting

confidence: 74%

Fireside Corrosion in Oxy-fuel Combustion of Coal

et al. 2013

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Oxy-fuel combustion is based on burning fossil fuels in a mixture of recirculated flue gas and oxygen, rather than in air. An optimized oxy-combustion power plant will have ultra-low emissions since the flue gas that results from oxy-fuel combustion is almost all CO 2 and water vapor. Once the water vapor is condensed, it is relatively easy to sequester the CO 2 so that it does not escape into the atmosphere. A variety of laboratory tests comparing air-firing to oxy-firing conditions, and tests examining specific simpler combinations of oxidants, were conducted at 650-700 °C. Alloys studied included model Fe-Cr and Ni-Cr alloys, commercial ferritic steels, austenitic steels, and nickel base superalloys. The observed corrosion behavior shows accelerated corrosion even with sulfate additions that remain solid at the tested temperatures, encapsulation of ash components in outer iron oxide scales, and a differentiation between oxy-fuel combustion flue gas recirculation choices.

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“…Despite the properties mentioned, ferritic alloys also susceptible to corrosion that will cause the material to scale, exfoliate and undergo changes in physical properties. Many studies have shown ferritic alloys resistance towards corrosion is significantly challenged by the presence of water vapour [2][3][4][5][6][7][8]. However, the reason behind the phenomena is still unexplainable.…”

Section: Introductionmentioning

confidence: 99%

Effect of dissolved hydrogen on Schottky barrier height of Fe-Cr alloy heterojunction

Berahim

Zaharudin

Ani

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The presence of water vapour at high temperature oxidation has certain effects on ferritic alloy in comparison to dry environment. It is hypothesized that at high temperature; water vapour provides hydrogen, which will dissolve into ferritic alloy substrate and altering their electronic state at the metal-oxide interface. This work aimed to clarify the change in electronic state of metal-oxide heterojunction with the presence of hydrogen/water vapour. In this study, the Schottky Barrier (SB) was created by sputtering Cr 2 O 3 onto prepared samples by using RF Magnetron sputtering machine. The existence of Fe/Cr 2 O 3 junction was characterized by using XRD. The surfaces were observed by using Optical Microscope (OM) and Scanning Electron Microscope (SEM). The samples were then exposed in dry and humid condition at temperature of 473 K and 1073 K. In dry condition, 100% Ar is flown inside the furnace, while in wet condition mixture of 95% Ar and 5% H was used. I-V measurement of the junction was done to determine the Schottky Barrier Height(SBH) of the samples in the corresponding ambient. The results show that in Fe/Cr 2 O 3 junction, with presence of hydrogen at temperature 473 K; the SBH was reduced by the scale factor of 1.054 and at 1073 K in wet ambient by factor of 1.068. Meanwhile, in Fe-Cr/Cr 2 O 3 junction with presence of hydrogen, the value of SBH was increased by scale factor of 1.068 at temperature 473 K while at 1073 K, the SBH also increased by factor of 1.009.

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The Effect of Water Vapor on High Temperature Oxidation of Fe-Cr Alloys at 1073 K

Cited by 62 publications

References 19 publications

Effect of Alloy Composition and Exposure Conditions on the Selective Oxidation Behavior of Ferritic Fe–Cr and Fe–Cr–X Alloys

Effect of Alloy Composition and Exposure Conditions on the Selective Oxidation Behavior of Ferritic Fe–Cr and Fe–Cr–X Alloys

Fireside Corrosion in Oxy-fuel Combustion of Coal

Effect of dissolved hydrogen on Schottky barrier height of Fe-Cr alloy heterojunction

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