Solubility of sulfur in pure Cr2O3 at 1000�C

Benlyamani, M.; Ajersch, F.; Kennedy, G.

doi:10.1007/bf00751795

Cited by 14 publications

(2 citation statements)

References 15 publications

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“…The synchrotron X-ray nano-beam (beam size of 200 nm x 300 nm) was scanned across the cross section of the protective and non-protective regions. [32]. Our EDX analysis at the oxide layer in the non-protective region indicates that the overall concentration of sulfur is 0.52 wt%.…”

Section: Effect Of Alloy and Gas Composition On Ash Corrosion Ratementioning

confidence: 73%

Effects of calcium in ash on the corrosion performance of Ni-based alloys in simulated oxy-fuel environment

Zeng

Natesan

Cai

et al. 2016

Fuel

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Increasing the efficiency of coal power plants requires raising the operating temperature above 650C. However, coal ash can severely attack alloy materials at high temperature. For example, the corrosion rates of commercial Fe-and Ni-based alloys are generally greater than 2 mm/year at 750C in the gas environment of oxy-fuel combustion. Thus, a critical study is needed to determine the effect of the constituents in the ash on corrosion and find an approach to reduce the corrosion rates in an ash-laden environment at high temperature. The role of CaO in the ash (typical of U.S. Western coal ash) has been investigated in laboratory exposure environments with various structural alloys. Detailed results are presented on weight change, scale thickness, internal penetration, microstructural characteristics of corrosion products, and the cracking of scales for the alloys after exposure at 750°C. The thermal stability of K 3 Al(SO 4) 3 under the environment of oxy-fuel combustion was determined by thermogravimetric analysis and differential thermal analysis. The reaction of this low melting temperature salt with the CaO-containing ash is discussed. In addition, we performed synchrotron nanobeam X-ray analysis to study the phase and chemical composition of the oxide layers on the alloy surface. Results from these studies are used to address the role of CaO in ash in the long-term corrosion performance of alloys.

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Section: Effect Of Alloy and Gas Composition On Ash Corrosion Ratementioning

confidence: 73%

Effects of calcium in ash on the corrosion performance of Ni-based alloys in simulated oxy-fuel environment

Zeng

Natesan

Cai

et al. 2016

Fuel

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“…A previous study of the solubility of sulfur in pure Cr203 (17) has shown that the mechanism of the incorporation of sulfur on a specific lattice site is still not clear. It has also been shown that the nature of the conduction from type "p" to type "n" can vary as a function of the impurity content.…”

Section: Discussionmentioning

confidence: 98%

Diffusion of Sulfur in Polycrystalline and Monocrystalline Cr2 O 3

Benlyamani¹,

Ajersch²,

Kennedy

1989

J. Electrochem. Soc.

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Polycrystalline samples of Cr203 with an average grain size of about 6.5 ~m and with negligible residual porosity were prepared from ultrapure Cr203 powder sintered at 1873 K under purified argon. Monocrystalline, as well as the polycrystalline samples, were sectioned into small parallelepipeds, polished and exposed to 3~S at Pso2 = 10 -2 atm and Po2 --0.8-1.0 atm in a sealed quartz tube at temperatures from 1173 to 1373 K. The sulfur penetration was determined by measuring the activity of the sample after removing successive layers (3-5 ~m) by abrasion polishing. The volume diffusion coefficients measured 1.07-5.0 • 10 -'3 cm 2 s -~ with an activation energy of 27.6 kcal, whereas the grain boundary diffusion coefficients were about 5 orders of magnitude higher than the volume diffusion coefficients with an activation energy of about 40 kcal. The results indicated that grain boundary diffusion appears to be the predominant mechanism of sulfur transport for the polycrystal]ine samples. Alloys containing Fe, Ni, and Cr which generally show ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.120.3 Downloaded on 2015-07-06 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 134.129.120.3 Downloaded on 2015-07-06 to IP

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Fundamentals of High Temperature Corrosion

Schütze

2013

Materials Science and Technology

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The sections in this article are Introduction High Temperature Corrosion in Technical Applications High Temperature Corrosion Resistance Fundamentals of Oxidation Stability of the Corrosion Product Formation and Growth of Oxide Scales Initial Stages Defect Chemistry Scale Growth by Solid State Diffusion Scale Growth Controlled by Mechanisms Other than Solid State Diffusion Specific Aspects of Oxide Scale Growth on Alloys Internal Oxidation/Corrosion The Influence of Mechanical Stress on Oxidation Stresses in Oxide Scales Mechanical Scale Failure Healing of Oxide Scale Cracks The Role of Internal Corrosion Chemical Scale Failure Sulfate Induced Hot Corrosion Vanadate Induced Hot Corrosion Corrosion Without the Formation of a Solid Scale Molten Phases as Corrosion Products Volatile Corrosion Products Gas Corrosion by Species Other than Oxygen Carburization and Metal Dusting Internal Carburization Metal Dusting Sulfidation Chlorination Water Vapor Hydrogen Experimental Techniques

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Solubility of sulfur in pure Cr2O3 at 1000�C

Cited by 14 publications

References 15 publications

Effects of calcium in ash on the corrosion performance of Ni-based alloys in simulated oxy-fuel environment

Effects of calcium in ash on the corrosion performance of Ni-based alloys in simulated oxy-fuel environment

Diffusion of Sulfur in Polycrystalline and Monocrystalline Cr2 O 3

Fundamentals of High Temperature Corrosion

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